//second argument unused
//rectract with step size
//first used to avoid computation repetition
arma::mat fixRank::retract(double stepSize, std::string method,
bool first){
arma::mat S,Us,Vs;
arma::vec Sigma_s;
bool conv;
Yt=Y;
if(first){
conv=arma::qr_econ(Qu,Ru,Up_desc);
if(!conv) return Y;
conv=arma::qr_econ(Qv,Rv,Vp_desc);
if(!conv) return Y;
}
S=arma::mat(2*r,2*r,arma::fill::zeros);
S(arma::span(0,r-1),arma::span(0,r-1))=arma::diagmat(Sigma)+M_desc*stepSize;
S(arma::span(r,2*r-1),arma::span(0,r-1))=Ru*stepSize;
S(arma::span(0,r-1),arma::span(r,2*r-1))=Rv.t()*stepSize;
conv=arma::svd_econ(Us,Sigma_s,Vs,S);
if(!conv) return Y;
Sigma_t=Sigma_s(arma::span(0,r-1));
Ut=U*Us(arma::span(0,r-1),arma::span(0,r-1))+Qu*Us(arma::span(r,2*r-1),arma::span(0,r-1));
Vt=V*Vs(arma::span(0,r-1),arma::span(0,r-1))+Qv*Vs(arma::span(r,2*r-1),arma::span(0,r-1));
Yt=Ut*arma::diagmat(Sigma_t)*Vt.t();
return Yt;
}
void ScalarODE::nonlocal_constraint(bool compute_jacobian,
AssemblyContext& context,
CachedValues& /* cache */ )
{
libMesh::DenseSubMatrix<libMesh::Number> &Kss =
context.get_elem_jacobian(_scalar_ode_var, _scalar_ode_var); // R_{s},{s}
libMesh::DenseSubVector<libMesh::Number> &Fs =
context.get_elem_residual(_scalar_ode_var); // R_{s}
const libMesh::Number constraint =
(*constraint_function)(context, libMesh::Point(0),
context.get_time());
Fs(0) += constraint;
if (compute_jacobian)
{
// FIXME: we should replace this hacky FDM with a hook to the
// AD fparser stuff
libMesh::DenseSubVector<libMesh::Number> &Us =
const_cast<libMesh::DenseSubVector<libMesh::Number>&>
(context.get_elem_solution(_scalar_ode_var)); // U_{s}
const libMesh::Number s = Us(0);
Us(0) = s + this->_epsilon;
libMesh::Number constraint_jacobian =
(*constraint_function)(context, libMesh::Point(0),
context.get_time());
Us(0) = s - this->_epsilon;
constraint_jacobian -=
(*constraint_function)(context, libMesh::Point(0),
context.get_time());
Us(0) = s;
constraint_jacobian /= (2*this->_epsilon);
Kss(0,0) += constraint_jacobian *
context.get_elem_solution_derivative();
}
return;
}
void AveragedTurbine<Mu>::nonlocal_mass_residual( bool compute_jacobian,
AssemblyContext& context,
CachedValues& /* cache */ )
{
libMesh::DenseSubMatrix<libMesh::Number> &Kss =
context.get_elem_jacobian(this->fan_speed_var(), this->fan_speed_var()); // R_{s},{s}
libMesh::DenseSubVector<libMesh::Number> &Fs =
context.get_elem_residual(this->fan_speed_var()); // R_{s}
const libMesh::DenseSubVector<libMesh::Number> &Us =
context.get_elem_solution_rate(this->fan_speed_var());
const libMesh::Number& fan_speed = Us(0);
Fs(0) -= this->moment_of_inertia * fan_speed;
if (compute_jacobian)
{
Kss(0,0) -= this->moment_of_inertia * context.get_elem_solution_rate_derivative();
}
return;
}
bool DifferentiablePhysics::nonlocal_mass_residual(bool request_jacobian,
DiffContext &c)
{
FEMContext &context = cast_ref<FEMContext&>(c);
for (unsigned int var = 0; var != context.n_vars(); ++var)
{
if (!this->is_time_evolving(var))
continue;
if (c.get_system().variable(var).type().family != SCALAR)
continue;
const std::vector<dof_id_type>& dof_indices =
context.get_dof_indices(var);
const unsigned int n_dofs = cast_int<unsigned int>
(dof_indices.size());
DenseSubVector<Number> &Fs = context.get_elem_residual(var);
DenseSubMatrix<Number> &Kss = context.get_elem_jacobian( var, var );
const libMesh::DenseSubVector<libMesh::Number> &Us =
context.get_elem_solution(var);
for (unsigned int i=0; i != n_dofs; ++i)
{
Fs(i) -= Us(i);
if (request_jacobian)
Kss(i,i) -= context.elem_solution_rate_derivative;
}
}
return request_jacobian;
}
void DiFeliceDrag::setForce() const
{
if (scaleDia_ > 1)
Info << typeName << " using scale = " << scaleDia_ << endl;
else if (particleCloud_.cg() > 1){
scaleDia_=particleCloud_.cg();
Info << typeName << " using scale from liggghts cg = " << scaleDia_ << endl;
}
const volScalarField& nufField = forceSubM(0).nuField();
const volScalarField& rhoField = forceSubM(0).rhoField();
vector position(0,0,0);
scalar voidfraction(1);
vector Ufluid(0,0,0);
vector drag(0,0,0);
vector dragExplicit(0,0,0);
scalar dragCoefficient(0);
label cellI=0;
vector Us(0,0,0);
vector Ur(0,0,0);
scalar ds(0);
scalar nuf(0);
scalar rho(0);
scalar magUr(0);
scalar Rep(0);
scalar Cd(0);
interpolationCellPoint<scalar> voidfractionInterpolator_(voidfraction_);
interpolationCellPoint<vector> UInterpolator_(U_);
#include "setupProbeModel.H"
for(int index = 0;index < particleCloud_.numberOfParticles(); index++)
{
cellI = particleCloud_.cellIDs()[index][0];
drag = vector(0,0,0);
dragExplicit = vector(0,0,0);
Ufluid =vector(0,0,0);
if (cellI > -1) // particle Found
{
if(forceSubM(0).interpolation())
{
position = particleCloud_.position(index);
voidfraction = voidfractionInterpolator_.interpolate(position,cellI);
Ufluid = UInterpolator_.interpolate(position,cellI);
}else
{
voidfraction = voidfraction_[cellI];
Ufluid = U_[cellI];
}
Us = particleCloud_.velocity(index);
Ur = Ufluid-Us;
ds = 2*particleCloud_.radius(index);
nuf = nufField[cellI];
rho = rhoField[cellI];
magUr = mag(Ur);
Rep = 0;
Cd = 0;
dragCoefficient = 0;
if (magUr > 0)
{
// calc particle Re Nr
Rep = ds/scaleDia_*voidfraction*magUr/(nuf+SMALL);
// calc fluid drag Coeff
Cd = sqr(0.63 + 4.8/sqrt(Rep));
// calc model coefficient Xi
scalar Xi = 3.7 - 0.65 * exp(-sqr(1.5-log10(Rep))/2);
// calc particle's drag
dragCoefficient = 0.125*Cd*rho
*M_PI
*ds*ds
*scaleDia_
*pow(voidfraction,(2-Xi))*magUr
*scaleDrag_;
if (modelType_=="B")
dragCoefficient /= voidfraction;
drag = dragCoefficient*Ur; //total drag force!
forceSubM(0).explicitCorr(drag,dragExplicit,dragCoefficient,Ufluid,U_[cellI],Us,UsField_[cellI],forceSubM(0).verbose(),index);
}
if(forceSubM(0).verbose() && index >-1 && index <102)
{
Pout << "index = " << index << endl;
Pout << "scaleDrag_ = " << scaleDrag_ << endl;
Pout << "Us = " << Us << endl;
Pout << "Ur = " << Ur << endl;
Pout << "ds/scale = " << ds/scaleDia_ << endl;
Pout << "rho = " << rho << endl;
Pout << "nuf = " << nuf << endl;
Pout << "voidfraction = " << voidfraction << endl;
Pout << "Rep = " << Rep << endl;
Pout << "Cd = " << Cd << endl;
Pout << "drag (total) = " << drag << endl;
}
//Set value fields and write the probe
if(probeIt_)
{
#include "setupProbeModelfields.H"
vValues.append(drag); //first entry must the be the force
vValues.append(Ur);
sValues.append(Rep);
sValues.append(Cd);
sValues.append(voidfraction);
particleCloud_.probeM().writeProbe(index, sValues, vValues);
}
}
// write particle based data to global array
forceSubM(0).partToArray(index,drag,dragExplicit,Ufluid,dragCoefficient);
}
}
void BeetstraDrag::setForce() const
{
scale_=cg();
Info << "BeetstraDrag using scale from liggghts cg = " << scale_ << endl;
// get viscosity field
#ifdef comp
const volScalarField nufField = particleCloud_.turbulence().mu()/rho_;
#else
const volScalarField& nufField = particleCloud_.turbulence().nu();
#endif
vector position(0,0,0);
scalar voidfraction(1);
vector Ufluid(0,0,0);
vector drag(0,0,0);
label cellI=0;
scalar beta(0);
vector Us(0,0,0);
vector Ur(0,0,0);
scalar ds(0);
scalar nuf(0);
scalar rho(0);
scalar magUr(0);
scalar Rep(0);
scalar Vs(0);
scalar localPhiP(0);
scalar filterDragPrefactor(1.0);
scalar cCorrParcelSize_(1.0) ;
scalar vCell(0);
scalar FfFilterPrime(1);
scalar F0=0.;
scalar G0=0.;
interpolationCellPoint<scalar> voidfractionInterpolator_(voidfraction_);
interpolationCellPoint<vector> UInterpolator_(U_);
#include "setupProbeModel.H"
for(int index = 0;index < particleCloud_.numberOfParticles(); index++)
{
//if(mask[index][0])
//{
cellI = particleCloud_.cellIDs()[index][0];
drag = vector(0,0,0);
Ufluid= vector(0,0,0);
if (cellI > -1) // particle Found
{
if(interpolation_)
{
position = particleCloud_.position(index);
voidfraction = voidfractionInterpolator_.interpolate(position,cellI);
Ufluid = UInterpolator_.interpolate(position,cellI);
//Ensure interpolated void fraction to be meaningful
// Info << " --> voidfraction: " << voidfraction << endl;
if(voidfraction>1.00) voidfraction = 1.00;
if(voidfraction<0.10) voidfraction = 0.10;
}
else
{
voidfraction = voidfraction_[cellI];
Ufluid = U_[cellI];
}
Us = particleCloud_.velocity(index);
Ur = Ufluid-Us;
ds = 2*particleCloud_.radius(index);
dPrim_ = ds/scale_;
nuf = nufField[cellI];
rho = rho_[cellI];
magUr = mag(Ur);
Rep = 0;
Vs = ds*ds*ds*M_PI/6;
localPhiP = 1-voidfraction+SMALL;
vCell = U_.mesh().V()[cellI];
if (magUr > 0)
{
// calc particle Re Nr
Rep = dPrim_*voidfraction*magUr/(nuf+SMALL);
// 3 - C - 1 - In this section we could insert parameters
// or functions
// that come from a database
// calc model coefficient F0
F0 = 10.f * localPhiP / voidfraction / voidfraction
+ voidfraction * voidfraction * ( 1.0+1.5*sqrt(localPhiP) );
// calc model coefficient G0
G0 = 0.01720833 * Rep / voidfraction / voidfraction //0.0172083 = 0.413/24
* ( 1.0 / voidfraction + 3.0 * localPhiP * voidfraction + 8.4
* powf(Rep,-0.343) )
/ ( 1.0 + powf( 10., 3.0* localPhiP )
* powf( Rep,-(1.0+4.0*localPhiP)/2.0 ) );
// calc model coefficient beta
beta = 18.*nuf*rho/(dPrim_*dPrim_)
*voidfraction
*(F0 + G0);
//Apply filtered drag correction
if(useFilteredDragModel_)
{
FfFilterPrime = FfFilterFunc(
filtDragParamsLChar2_,
vCell,
0
);
filterDragPrefactor = 1 - fFuncFilteredDrag(FfFilterPrime, localPhiP)
* hFuncFilteredDrag(localPhiP);
beta *= filterDragPrefactor;
}
if(useParcelSizeDependentFilteredDrag_) //Apply filtered drag correction
{
scalar dParceldPrim = scale_;
cCorrParcelSize_ =
cCorrFunctionFilteredDrag(
filtDragParamsK_,
filtDragParamsALimit_,
filtDragParamsAExponent_,
localPhiP,
dParceldPrim
);
beta *= cCorrParcelSize_;
}
// calc particle's drag
drag = Vs * beta * Ur;
if (modelType_=="B")
drag /= voidfraction;
}
// 3 - C - 2 - This is a standardized debug and report section
if( verbose_ ) //&& index>100 && index < 105)
{
Info << "index / cellI = " << index << tab << cellI << endl;
Info << "position = " << particleCloud_.position(index) << endl;
Info << "Us = " << Us << endl;
Info << "Ur = " << Ur << endl;
Info << "ds = " << ds << endl;
Info << "rho = " << rho << endl;
Info << "nuf = " << nuf << endl;
Info << "voidfraction = " << voidfraction << endl;
Info << "voidfraction_[cellI]: " << voidfraction_[cellI] << endl;
Info << "Rep = " << Rep << endl;
Info << "filterDragPrefactor = " << filterDragPrefactor << endl;
Info << "fFuncFilteredDrag: " << fFuncFilteredDrag(FfFilterPrime, localPhiP) << endl;
Info << "hFuncFilteredDrag: " << hFuncFilteredDrag(localPhiP) << endl;
Info << "cCorrParcelSize: " << cCorrParcelSize_ << endl;
Info << "F0 / G0: " << F0 << tab << G0 << endl;
Info << "beta: " << beta << endl;
Info << "drag = " << drag << endl;
Info << "\nBeetstra drag model settings: treatExplicit " << treatExplicit_ << tab
<< "verbose: " << verbose_ << tab
<< "dPrim: " << dPrim_ << tab
<< "interpolation: " << interpolation_ << tab
<< "filteredDragM: " << useFilteredDragModel_ << tab
<< "parcelSizeDepDrag: " << useParcelSizeDependentFilteredDrag_
<< endl << endl;
}
//Set value fields and write the probe
if(probeIt_)
{
#include "setupProbeModelfields.H"
vValues.append(drag); //first entry must the be the force
vValues.append(Ur);
sValues.append(Rep);
sValues.append(beta);
sValues.append(voidfraction);
sValues.append(filterDragPrefactor);
particleCloud_.probeM().writeProbe(index, sValues, vValues);
}
}
// set force on particle
if(treatExplicit_) for(int j=0;j<3;j++) expForces()[index][j] += drag[j];
else for(int j=0;j<3;j++) impForces()[index][j] += drag[j];
// set Cd
if(implDEM_)
{
for(int j=0;j<3;j++) fluidVel()[index][j]=Ufluid[j];
if (modelType_=="B")
Cds()[index][0] = Vs*beta/voidfraction;
else
Cds()[index][0] = Vs*beta;
}else{
for(int j=0;j<3;j++) DEMForces()[index][j] += drag[j];
}
//}
}
}
void MeiLift::setForce() const
{
const volScalarField& nufField = forceSubM(0).nuField();
const volScalarField& rhoField = forceSubM(0).rhoField();
vector position(0,0,0);
vector lift(0,0,0);
vector Us(0,0,0);
vector Ur(0,0,0);
scalar magUr(0);
scalar magVorticity(0);
scalar ds(0);
scalar dParcel(0);
scalar nuf(0);
scalar rho(0);
scalar voidfraction(1);
scalar Rep(0);
scalar Rew(0);
scalar Cl(0);
scalar Cl_star(0);
scalar J_star(0);
scalar Omega_eq(0);
scalar alphaStar(0);
scalar epsilon(0);
scalar omega_star(0);
vector vorticity(0,0,0);
volVectorField vorticity_ = fvc::curl(U_);
#include "resetVorticityInterpolator.H"
#include "resetUInterpolator.H"
#include "setupProbeModel.H"
for(int index = 0;index < particleCloud_.numberOfParticles(); index++)
{
//if(mask[index][0])
//{
lift = vector::zero;
label cellI = particleCloud_.cellIDs()[index][0];
if (cellI > -1) // particle Found
{
Us = particleCloud_.velocity(index);
if( forceSubM(0).interpolation() )
{
position = particleCloud_.position(index);
Ur = UInterpolator_().interpolate(position,cellI)
- Us;
vorticity = vorticityInterpolator_().interpolate(position,cellI);
}
else
{
Ur = U_[cellI]
- Us;
vorticity=vorticity_[cellI];
}
magUr = mag(Ur);
magVorticity = mag(vorticity);
if (magUr > 0 && magVorticity > 0)
{
ds = 2*particleCloud_.radius(index);
dParcel = ds;
forceSubM(0).scaleDia(ds,index); //caution: this fct will scale ds!
nuf = nufField[cellI];
rho = rhoField[cellI];
//Update any scalar or vector quantity
for (int iFSub=0;iFSub<nrForceSubModels();iFSub++)
forceSubM(iFSub).update( index,
cellI,
ds,
nuf,
rho,
forceSubM(0).verbose()
);
// calc dimensionless properties
Rep = ds*magUr/nuf;
Rew = magVorticity*ds*ds/nuf;
alphaStar = magVorticity*ds/magUr/2.0;
epsilon = sqrt(2.0*alphaStar /Rep );
omega_star=2.0*alphaStar;
//Basic model for the correction to the Saffman lift
//Based on McLaughlin (1991)
if(epsilon < 0.1)
{
J_star = -140 *epsilon*epsilon*epsilon*epsilon*epsilon
*log( 1./(epsilon*epsilon+SMALL) );
}
else if(epsilon > 20)
{
J_star = 1.0-0.287/(epsilon*epsilon+SMALL);
}
else
{
J_star = 0.3
*( 1.0
+tanh( 2.5 * log10(epsilon+0.191) )
)
*( 0.667
+tanh( 6.0 * (epsilon-0.32) )
);
}
Cl=J_star*4.11*epsilon; //multiply McLaughlin's correction to the basic Saffman model
//Second order terms given by Loth and Dorgan 2009
if(useSecondOrderTerms_)
{
Omega_eq = omega_star/2.0*(1.0-0.0075*Rew)*(1.0-0.062*sqrt(Rep)-0.001*Rep);
Cl_star=1.0-(0.675+0.15*(1.0+tanh(0.28*(omega_star/2.0-2.0))))*tanh(0.18*sqrt(Rep));
Cl += Omega_eq*Cl_star;
}
lift = 0.125*M_PI
*rho
*Cl
*magUr*Ur^vorticity/magVorticity
*ds*ds; //total force on all particles in parcel
forceSubM(0).scaleForce(lift,dParcel,index);
if (modelType_=="B")
{
voidfraction = particleCloud_.voidfraction(index);
lift /= voidfraction;
}
}
//**********************************
//SAMPLING AND VERBOSE OUTOUT
if( forceSubM(0).verbose() )
{
Pout << "index = " << index << endl;
Pout << "Us = " << Us << endl;
Pout << "Ur = " << Ur << endl;
Pout << "vorticity = " << vorticity << endl;
Pout << "dprim = " << ds << endl;
Pout << "rho = " << rho << endl;
Pout << "nuf = " << nuf << endl;
Pout << "Rep = " << Rep << endl;
Pout << "Rew = " << Rew << endl;
Pout << "alphaStar = " << alphaStar << endl;
Pout << "epsilon = " << epsilon << endl;
Pout << "J_star = " << J_star << endl;
Pout << "lift = " << lift << endl;
}
//Set value fields and write the probe
if(probeIt_)
{
#include "setupProbeModelfields.H"
// Note: for other than ext one could use vValues.append(x)
// instead of setSize
vValues.setSize(vValues.size()+1, lift); //first entry must the be the force
vValues.setSize(vValues.size()+1, Ur);
vValues.setSize(vValues.size()+1, vorticity);
sValues.setSize(sValues.size()+1, Rep);
sValues.setSize(sValues.size()+1, Rew);
sValues.setSize(sValues.size()+1, J_star);
particleCloud_.probeM().writeProbe(index, sValues, vValues);
}
// END OF SAMPLING AND VERBOSE OUTOUT
//**********************************
}
// write particle based data to global array
forceSubM(0).partToArray(index,lift,vector::zero);
//}
}
}
void GidaspowDrag::setForce() const
{
if (scaleDia_ > 1)
Info << "Gidaspow using scale = " << scaleDia_ << endl;
else if (particleCloud_.cg() > 1){
scaleDia_=particleCloud_.cg();
Info << "Gidaspow using scale from liggghts cg = " << scaleDia_ << endl;
}
// get viscosity field
#ifdef comp
const volScalarField nufField = particleCloud_.turbulence().mu() / rho_;
#else
const volScalarField& nufField = particleCloud_.turbulence().nu();
#endif
vector position(0,0,0);
scalar voidfraction(1);
vector Ufluid(0,0,0);
vector drag(0,0,0);
label cellI=0;
vector Us(0,0,0);
vector Uturb(0,0,0);
vector Ur(0,0,0);
scalar ds(0);
scalar nuf(0);
scalar rho(0);
scalar magUr(0);
scalar Rep(0);
scalar Vs(0);
scalar localPhiP(0);
scalar CdMagUrLag(0); //Cd of the very particle
scalar KslLag(0); //momentum exchange of the very particle (per unit volume)
scalar betaP(0); //momentum exchange of the very particle
interpolationCellPoint<scalar> voidfractionInterpolator_(voidfraction_);
interpolationCellPoint<vector> UInterpolator_(U_);
#include "setupProbeModel.H"
for(int index = 0;index < particleCloud_.numberOfParticles(); ++index)
{
//if(mask[index][0])
//{
cellI = particleCloud_.cellIDs()[index][0];
drag = vector(0,0,0);
betaP = 0;
Vs = 0;
Ufluid =vector(0,0,0);
voidfraction=0;
if (cellI > -1) // particle Found
{
position = particleCloud_.position(index);
if(interpolation_)
{
//position = particleCloud_.position(index);
voidfraction = voidfractionInterpolator_.interpolate(position,cellI);
Ufluid = UInterpolator_.interpolate(position,cellI);
//Ensure interpolated void fraction to be meaningful
// Info << " --> voidfraction: " << voidfraction << endl;
if(voidfraction>1.00) voidfraction = 1.0;
if(voidfraction<0.10) voidfraction = 0.10;
}
else
{
voidfraction = voidfraction_[cellI];
Ufluid = U_[cellI];
}
Us = particleCloud_.velocity(index);
Ur = Ufluid-Us;
//accounting for turbulent dispersion
if(particleCloud_.dispersionM().isActive())
{
Uturb=particleCloud_.fluidTurbVel(index);
Ur=(Ufluid+Uturb)-Us;
}
magUr = mag(Ur);
ds = 2*particleCloud_.radius(index)*phi_;
rho = rho_[cellI];
nuf = nufField[cellI];
Rep=0.0;
localPhiP = 1.0f-voidfraction+SMALL;
Vs = ds*ds*ds*M_PI/6;
//Compute specific drag coefficient (i.e., Force per unit slip velocity and per m³ SUSPENSION)
//Wen and Yu, 1966
if(voidfraction > 0.8) //dilute
{
Rep=ds/scaleDia_*voidfraction*magUr/nuf;
CdMagUrLag = (24.0*nuf/(ds/scaleDia_*voidfraction)) //1/magUr missing here, but compensated in expression for KslLag!
*(scalar(1)+0.15*Foam::pow(Rep, 0.687));
KslLag = 0.75*(
rho*localPhiP*voidfraction*CdMagUrLag
/
(ds/scaleDia_*Foam::pow(voidfraction,2.65))
);
}
//Ergun, 1952
else //dense
{
KslLag = (150*Foam::pow(localPhiP,2)*nuf*rho)/
(voidfraction*ds/scaleDia_*ds/scaleDia_+SMALL)
+
(1.75*(localPhiP) * magUr * rho)/
((ds/scaleDia_));
}
// calc particle's drag coefficient (i.e., Force per unit slip velocity and per m³ PARTICLE)
betaP = KslLag / localPhiP;
// calc particle's drag
drag = Vs * betaP * Ur * scaleDrag_;
if (modelType_=="B")
drag /= voidfraction;
if(verbose_ && index >=0 && index <1)
{
Pout << " "<< endl;
Pout << "Gidaspow drag force verbose: " << endl;
Pout << "magUr = " << magUr << endl;
Pout << "localPhiP = " << localPhiP << endl;
Pout << "CdMagUrLag = " << CdMagUrLag << endl;
Pout << "treatExplicit_ = " << treatExplicit_ << endl;
Pout << "implDEM_ = " << implDEM_ << endl;
Pout << "modelType_ = " << modelType_ << endl;
Pout << "KslLag = " << KslLag << endl;
Pout << "cellI = " << cellI << endl;
Pout << "index = " << index << endl;
Pout << "Ufluid = " << Ufluid << endl;
Pout << "Uturb = " << Uturb << endl;
Pout << "Us = " << Us << endl;
Pout << "Ur = " << Ur << endl;
Pout << "Vs = " << Vs << endl;
Pout << "ds = " << ds << endl;
Pout << "ds/scale = " << ds/scaleDia_ << endl;
Pout << "phi = " << phi_ << endl;
Pout << "rho = " << rho << endl;
Pout << "nuf = " << nuf << endl;
Pout << "voidfraction = " << voidfraction << endl;
Pout << "Rep = " << Rep << endl;
Pout << "localPhiP = " << localPhiP << endl;
Pout << "betaP = " << betaP << endl;
Pout << "drag = " << drag << endl;
Pout << "position = " << position << endl;
Pout << " "<< endl;
}
//Set value fields and write the probe
if(probeIt_)
{
#include "setupProbeModelfields.H"
vValues.append(drag); //first entry must the be the force
vValues.append(Ur);
sValues.append(Rep);
sValues.append(betaP);
sValues.append(voidfraction);
particleCloud_.probeM().writeProbe(index, sValues, vValues);
}
}
// set force on particle
//treatExplicit_ = false by default
if(treatExplicit_) for(int j=0;j<3;j++) expForces()[index][j] += drag[j];
else for(int j=0;j<3;j++) impForces()[index][j] += drag[j];
// set Cd
//implDEM_ = false by default
if(implDEM_)
{
for(int j=0;j<3;j++) fluidVel()[index][j]=Ufluid[j];
if (modelType_=="B" && cellI > -1)
Cds()[index][0] = Vs*betaP/voidfraction*scaleDrag_;
else
Cds()[index][0] = Vs*betaP*scaleDrag_;
}else{
for(int j=0;j<3;j++) DEMForces()[index][j] += drag[j];
}
//}// end if mask
}// end loop particles
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
void scalarGeneralExchange::manipulateScalarField(volScalarField& explicitEulerSource,
volScalarField& implicitEulerSource,
int speciesID) const
{
// reset Scalar field
explicitEulerSource.internalField() = 0.0;
implicitEulerSource.internalField() = 0.0;
if(speciesID>=0 && particleSpeciesValue_[speciesID]<0.0) //skip if species is not active
return;
//Set the names of the exchange fields
word fieldName;
word partDatName;
word partFluxName;
word partTransCoeffName;
word partFluidName;
scalar transportParameter;
// realloc the arrays to pull particle data
if(speciesID<0) //this is the temperature - always pull from LIGGGHTS
{
fieldName = tempFieldName_;
partDatName = partTempName_;
partFluxName = partHeatFluxName_;
partTransCoeffName = partHeatTransCoeffName_;
partFluidName = partHeatFluidName_;
transportParameter = lambda_;
allocateMyArrays(0.0);
particleCloud_.dataExchangeM().getData(partDatName,"scalar-atom", partDat_);
}
else
{
fieldName = eulerianFieldNames_[speciesID];
partDatName = partSpeciesNames_[speciesID];
partFluxName = partSpeciesFluxNames_[speciesID];
partTransCoeffName = partSpeciesTransCoeffNames_[speciesID];
partFluidName = partSpeciesFluidNames_[speciesID];
transportParameter = DMolecular_[speciesID];
allocateMyArrays(0.0);
if(particleSpeciesValue_[speciesID]>ALARGECONCENTRATION)
particleCloud_.dataExchangeM().getData(partDatName,"scalar-atom", partDat_);
}
if (scaleDia_ > 1)
Info << typeName << " using scale = " << scaleDia_ << endl;
else if (particleCloud_.cg() > 1)
{
scaleDia_=particleCloud_.cg();
Info << typeName << " using scale from liggghts cg = " << scaleDia_ << endl;
}
//==============================
// get references
const volScalarField& voidfraction_(particleCloud_.mesh().lookupObject<volScalarField> (voidfractionFieldName_)); // ref to voidfraction field
const volVectorField& U_(particleCloud_.mesh().lookupObject<volVectorField> (velFieldName_));
const volScalarField& fluidScalarField_(particleCloud_.mesh().lookupObject<volScalarField> (fieldName)); // ref to scalar field
const volScalarField& nufField = forceSubM(0).nuField();
//==============================
// calc La based heat flux
vector position(0,0,0);
scalar voidfraction(1);
vector Ufluid(0,0,0);
scalar fluidValue(0);
label cellI=0;
vector Us(0,0,0);
vector Ur(0,0,0);
scalar dscaled(0);
scalar nuf(0);
scalar magUr(0);
scalar As(0);
scalar Rep(0);
scalar Pr(0);
scalar sDth(scaleDia_*scaleDia_*scaleDia_);
interpolationCellPoint<scalar> voidfractionInterpolator_(voidfraction_);
interpolationCellPoint<vector> UInterpolator_(U_);
interpolationCellPoint<scalar> fluidScalarFieldInterpolator_(fluidScalarField_);
#include "setupProbeModel.H"
for(int index = 0;index < particleCloud_.numberOfParticles(); ++index)
{
cellI = particleCloud_.cellIDs()[index][0];
if(cellI >= 0)
{
if(forceSubM(0).interpolation())
{
position = particleCloud_.position(index);
voidfraction = voidfractionInterpolator_.interpolate(position,cellI);
Ufluid = UInterpolator_.interpolate(position,cellI);
fluidValue = fluidScalarFieldInterpolator_.interpolate(position,cellI);
}else
{
voidfraction = voidfraction_[cellI];
Ufluid = U_[cellI];
fluidValue = fluidScalarField_[cellI];
}
// calc relative velocity
Us = particleCloud_.velocity(index);
Ur = Ufluid-Us;
magUr = mag(Ur);
dscaled = 2*particleCloud_.radius(index)/scaleDia_;
As = dscaled*dscaled*M_PI*sDth;
nuf = nufField[cellI];
Rep = dscaled*magUr/nuf;
if(speciesID<0) //have temperature
Pr = Prandtl_;
else
Pr = max(SMALL,nuf/transportParameter); //This is Sc for species
scalar alpha = transportParameter*(this->*Nusselt)(Rep,Pr,voidfraction)/(dscaled);
// calc convective heat flux [W]
scalar areaTimesTransferCoefficient = alpha * As;
scalar tmpPartFlux = areaTimesTransferCoefficient
* (fluidValue - partDat_[index][0]);
partDatFlux_[index][0] = tmpPartFlux;
// split implicit/explicit contribution
forceSubM(0).explicitCorrScalar( partDatTmpImpl_[index][0],
partDatTmpExpl_[index][0],
areaTimesTransferCoefficient,
fluidValue,
fluidScalarField_[cellI],
partDat_[index][0],
forceSubM(0).verbose()
);
if(validPartTransCoeff_)
partDatTransCoeff_[index][0] = alpha;
if(validPartFluid_)
partDatFluid_[index][0] = fluidValue;
if( forceSubM(0).verbose())
{
Pout << "fieldName = " << fieldName << endl;
Pout << "partTransCoeffName = " << partTransCoeffName << endl;
Pout << "index = " <<index << endl;
Pout << "partFlux = " << tmpPartFlux << endl;
Pout << "magUr = " << magUr << endl;
Pout << "As = " << As << endl;
Pout << "r = " << particleCloud_.radius(index) << endl;
Pout << "dscaled = " << dscaled << endl;
Pout << "nuf = " << nuf << endl;
Pout << "Rep = " << Rep << endl;
Pout << "Pr/Sc = " << Pr << endl;
Pout << "Nup/Shp = " << (this->*Nusselt)(Rep,Pr,voidfraction) << endl;
Pout << "partDatTransCoeff: " << partDatTransCoeff_[index][0] << endl;
Pout << "voidfraction = " << voidfraction << endl;
Pout << "partDat_[index][0] = " << partDat_[index][0] << endl ;
Pout << "fluidValue = " << fluidValue << endl ;
}
//Set value fields and write the probe
if(probeIt_)
{
#include "setupProbeModelfields.H"
vValues.append(Ur);
sValues.append((this->*Nusselt)(Rep,Pr,voidfraction));
sValues.append(Rep);
particleCloud_.probeM().writeProbe(index, sValues, vValues);
}
}
}
//Handle explicit and implicit source terms on the Euler side
//these are simple summations!
particleCloud_.averagingM().setScalarSum
(
explicitEulerSource,
partDatTmpExpl_,
particleCloud_.particleWeights(),
NULL
);
particleCloud_.averagingM().setScalarSum
(
implicitEulerSource,
partDatTmpImpl_,
particleCloud_.particleWeights(),
NULL
);
// scale with the cell volume to get (total) volume-specific source
explicitEulerSource.internalField() /= -explicitEulerSource.mesh().V();
implicitEulerSource.internalField() /= -implicitEulerSource.mesh().V();
// limit explicit source term
scalar explicitEulerSourceInCell;
forAll(explicitEulerSource,cellI)
{
explicitEulerSourceInCell = explicitEulerSource[cellI];
if(mag(explicitEulerSourceInCell) > maxSource_ )
{
explicitEulerSource[cellI] = sign(explicitEulerSourceInCell) * maxSource_;
}
}
void KochHillDrag::setForce() const
{
const volScalarField& nufField = forceSubM(0).nuField();
const volScalarField& rhoField = forceSubM(0).rhoField();
//update force submodels to prepare for loop
for (int iFSub=0;iFSub<nrForceSubModels();iFSub++)
forceSubM(iFSub).preParticleLoop(forceSubM(iFSub).verbose());
vector position(0,0,0);
scalar voidfraction(1);
vector Ufluid(0,0,0);
vector drag(0,0,0);
vector dragExplicit(0,0,0);
scalar dragCoefficient(0);
label cellI=0;
vector Us(0,0,0);
vector Ur(0,0,0);
scalar ds(0);
scalar dParcel(0);
scalar nuf(0);
scalar rho(0);
scalar magUr(0);
scalar Rep(0);
scalar Vs(0);
scalar volumefraction(0);
scalar betaP(0);
scalar piBySix(M_PI/6);
int couplingInterval(particleCloud_.dataExchangeM().couplingInterval());
#include "resetVoidfractionInterpolator.H"
#include "resetUInterpolator.H"
#include "setupProbeModel.H"
for(int index = 0;index < particleCloud_.numberOfParticles(); index++)
{
cellI = particleCloud_.cellIDs()[index][0];
drag = vector(0,0,0);
dragExplicit = vector(0,0,0);
dragCoefficient=0;
betaP = 0;
Vs = 0;
Ufluid =vector(0,0,0);
voidfraction=0;
if (cellI > -1) // particle Found
{
if(forceSubM(0).interpolation())
{
position = particleCloud_.position(index);
voidfraction = voidfractionInterpolator_().interpolate(position,cellI);
Ufluid = UInterpolator_().interpolate(position,cellI);
//Ensure interpolated void fraction to be meaningful
// Info << " --> voidfraction: " << voidfraction << endl;
if(voidfraction>1.00) voidfraction = 1.00;
if(voidfraction<0.40) voidfraction = 0.40;
}else
{
voidfraction = voidfraction_[cellI];
Ufluid = U_[cellI];
}
ds = particleCloud_.d(index);
dParcel = ds;
forceSubM(0).scaleDia(ds); //caution: this fct will scale ds!
nuf = nufField[cellI];
rho = rhoField[cellI];
Us = particleCloud_.velocity(index);
//Update any scalar or vector quantity
for (int iFSub=0;iFSub<nrForceSubModels();iFSub++)
forceSubM(iFSub).update( index,
cellI,
ds,
Ufluid,
Us,
nuf,
rho,
forceSubM(0).verbose()
);
Ur = Ufluid-Us;
magUr = mag(Ur);
Rep = 0;
Vs = ds*ds*ds*piBySix;
volumefraction = max(SMALL,min(1-SMALL,1-voidfraction));
if (magUr > 0)
{
// calc particle Re Nr
Rep = ds*voidfraction*magUr/(nuf+SMALL);
// calc model coefficient F0
scalar F0=0.;
if(volumefraction < 0.4)
{
F0 = (1. + 3.*sqrt((volumefraction)/2.) + (135./64.)*volumefraction*log(volumefraction)
+ 16.14*volumefraction
)/
(1+0.681*volumefraction-8.48*sqr(volumefraction)
+8.16*volumefraction*volumefraction*volumefraction
);
} else {
F0 = 10*volumefraction/(voidfraction*voidfraction*voidfraction);
}
// calc model coefficient F3
scalar F3 = 0.0673+0.212*volumefraction+0.0232/pow(voidfraction,5);
//Calculate F (the factor 0.5 is introduced, since Koch and Hill, ARFM 33:619–47, use the radius
//to define Rep, and we use the particle diameter, see vanBuijtenen et al., CES 66:2368–2376.
scalar F = voidfraction * (F0 + 0.5*F3*Rep);
// calc drag model coefficient betaP
betaP = 18.*nuf*rho/(ds*ds)*voidfraction*F;
// calc particle's drag
dragCoefficient = Vs*betaP;
if (modelType_=="B")
dragCoefficient /= voidfraction;
forceSubM(0).scaleCoeff(dragCoefficient,dParcel);
if(forceSubM(0).switches()[7]) // implForceDEMaccumulated=true
{
//get drag from the particle itself
for (int j=0 ; j<3 ; j++) drag[j] = particleCloud_.fAccs()[index][j]/couplingInterval;
}else
{
drag = dragCoefficient * Ur;
// explicitCorr
for (int iFSub=0;iFSub<nrForceSubModels();iFSub++)
forceSubM(iFSub).explicitCorr( drag,
dragExplicit,
dragCoefficient,
Ufluid, U_[cellI], Us, UsField_[cellI],
forceSubM(iFSub).verbose()
);
}
}
if(forceSubM(0).verbose() && index >=0 && index <2)
{
Pout << "cellI = " << cellI << endl;
Pout << "index = " << index << endl;
Pout << "Us = " << Us << endl;
Pout << "Ur = " << Ur << endl;
Pout << "dprim = " << ds << endl;
Pout << "rho = " << rho << endl;
Pout << "nuf = " << nuf << endl;
Pout << "voidfraction = " << voidfraction << endl;
Pout << "Rep = " << Rep << endl;
Pout << "betaP = " << betaP << endl;
Pout << "drag = " << drag << endl;
}
//Set value fields and write the probe
if(probeIt_)
{
#include "setupProbeModelfields.H"
// Note: for other than ext one could use vValues.append(x)
// instead of setSize
vValues.setSize(vValues.size()+1, drag); //first entry must the be the force
vValues.setSize(vValues.size()+1, Ur);
sValues.setSize(sValues.size()+1, Rep);
sValues.setSize(sValues.size()+1, betaP);
sValues.setSize(sValues.size()+1, voidfraction);
particleCloud_.probeM().writeProbe(index, sValues, vValues);
}
}
// write particle based data to global array
forceSubM(0).partToArray(index,drag,dragExplicit,Ufluid,dragCoefficient);
}
}
void KochHillDrag::setForce
(
double** const& mask,
double**& impForces,
double**& expForces,
double**& DEMForces
) const
{
// get viscosity field
#ifdef comp
const volScalarField nufField = particleCloud_.turbulence().mu()/rho_;
#else
const volScalarField& nufField = particleCloud_.turbulence().nu();
#endif
vector position(0,0,0);
scalar voidfraction(1);
vector Ufluid(0,0,0);
vector drag(0,0,0);
label cellI=0;
vector Us(0,0,0);
vector Ur(0,0,0);
scalar ds(0);
scalar nuf(0);
scalar rho(0);
scalar magUr(0);
scalar Rep(0);
scalar Vs(0);
scalar volumefraction(0);
interpolationCellPoint<scalar> voidfractionInterpolator_(voidfraction_);
interpolationCellPoint<vector> UInterpolator_(U_);
for(int index = 0;index < particleCloud_.numberOfParticles(); index++)
{
if(mask[index][0])
{
cellI = particleCloud_.cellIDs()[index][0];
drag = vector(0,0,0);
if (cellI > -1) // particle Found
{
if(interpolation_)
{
position = particleCloud_.position(index);
voidfraction = voidfractionInterpolator_.interpolate(position,cellI);
Ufluid = UInterpolator_.interpolate(position,cellI);
}else
{
voidfraction = particleCloud_.voidfraction(index);
Ufluid = U_[cellI];
}
Us = particleCloud_.velocity(index);
Ur = Ufluid-Us;
ds = 2*particleCloud_.radius(index);
nuf = nufField[cellI];
rho = rho_[cellI];
magUr = mag(Ur);
Rep = 0;
Vs = ds*ds*ds*M_PI/6;
volumefraction = 1-voidfraction+SMALL;
if (magUr > 0)
{
// calc particle Re Nr
Rep = ds/scale_*voidfraction*magUr/(nuf+SMALL);
// calc model coefficient F0
scalar F0=0.;
if(volumefraction < 0.4)
{
F0 = (1+3*sqrt((volumefraction)/2)+135/64*volumefraction*log(volumefraction)+16.14*volumefraction)/
(1+0.681*volumefraction-8.48*sqr(volumefraction)+8.16*volumefraction*volumefraction*volumefraction);
} else {
F0 = 10*volumefraction/(voidfraction*voidfraction*voidfraction);
}
// calc model coefficient F3
scalar F3 = 0.0673+0.212*volumefraction+0.0232/pow(voidfraction,5);
// calc model coefficient beta
scalar beta = 18*nuf*rho*voidfraction*voidfraction*volumefraction/(ds/scale_*ds/scale_)*
(F0 + 0.5*F3*Rep);
// calc particle's drag
drag = Vs*beta/volumefraction*Ur;
if (modelType_=="B")
drag /= voidfraction;
}
if(verbose_ && index >=0 && index <2)
{
Info << "index = " << index << endl;
Info << "Us = " << Us << endl;
Info << "Ur = " << Ur << endl;
Info << "ds = " << ds << endl;
Info << "ds/scale = " << ds/scale_ << endl;
Info << "rho = " << rho << endl;
Info << "nuf = " << nuf << endl;
Info << "voidfraction = " << voidfraction << endl;
Info << "Rep = " << Rep << endl;
Info << "drag = " << drag << endl;
}
}
// set force on particle
if(treatExplicit_) for(int j=0;j<3;j++) expForces[index][j] += drag[j];
else for(int j=0;j<3;j++) impForces[index][j] += drag[j];
}
}
}
void DiFeliceDrag::setForce() const
{
if (scaleDia_ > 1)
Info << "DiFeliceDrag using scale = " << scaleDia_ << endl;
else if (particleCloud_.cg() > 1){
scaleDia_=particleCloud_.cg();
Info << "DiFeliceDrag using scale from liggghts cg = " << scaleDia_ << endl;
}
// get viscosity field
#ifdef comp
const volScalarField nufField = particleCloud_.turbulence().mu() / rho_;
#else
const volScalarField& nufField = particleCloud_.turbulence().nu();
#endif
vector position(0,0,0);
scalar voidfraction(1);
vector Ufluid(0,0,0);
vector drag(0,0,0);
label cellI=0;
vector Us(0,0,0);
vector Ur(0,0,0);
scalar ds(0);
scalar nuf(0);
scalar rho(0);
scalar magUr(0);
scalar Rep(0);
scalar Cd(0);
vector UfluidFluct(0,0,0);
vector UsFluct(0,0,0);
vector dragExplicit(0,0,0);
scalar dragCoefficient(0);
interpolationCellPoint<scalar> voidfractionInterpolator_(voidfraction_);
interpolationCellPoint<vector> UInterpolator_(U_);
#include "setupProbeModel.H"
for(int index = 0;index < particleCloud_.numberOfParticles(); index++)
{
//if(mask[index][0])
//{
cellI = particleCloud_.cellIDs()[index][0];
drag = vector(0,0,0);
if (cellI > -1) // particle Found
{
if(interpolation_)
{
position = particleCloud_.position(index);
voidfraction = voidfractionInterpolator_.interpolate(position,cellI);
Ufluid = UInterpolator_.interpolate(position,cellI);
}else
{
voidfraction = voidfraction_[cellI];
Ufluid = U_[cellI];
}
Us = particleCloud_.velocity(index);
Ur = Ufluid-Us;
ds = 2*particleCloud_.radius(index);
nuf = nufField[cellI];
rho = rho_[cellI];
magUr = mag(Ur);
Rep = 0;
Cd = 0;
dragCoefficient = 0;
if (magUr > 0)
{
// calc particle Re Nr
Rep = ds/scaleDia_*voidfraction*magUr/(nuf+SMALL);
// calc fluid drag Coeff
Cd = sqr(0.63 + 4.8/sqrt(Rep));
// calc model coefficient Xi
scalar Xi = 3.7 - 0.65 * exp(-sqr(1.5-log10(Rep))/2);
// calc particle's drag
dragCoefficient = 0.125*Cd*rho
*M_PI
*ds*ds
*scaleDia_
*pow(voidfraction,(2-Xi))*magUr
*scaleDrag_;
if (modelType_=="B")
dragCoefficient /= voidfraction;
drag = dragCoefficient*Ur; //total drag force!
//Split forces
if(splitImplicitExplicit_)
{
UfluidFluct = Ufluid - U_[cellI];
UsFluct = Us - UsField_[cellI];
dragExplicit = dragCoefficient*(UfluidFluct - UsFluct); //explicit part of force
}
}
if(verbose_ && index >-1 && index <102)
{
Pout << "index = " << index << endl;
Pout << "Us = " << Us << endl;
Pout << "Ur = " << Ur << endl;
Pout << "ds/scale = " << ds/scaleDia_ << endl;
Pout << "rho = " << rho << endl;
Pout << "nuf = " << nuf << endl;
Pout << "voidfraction = " << voidfraction << endl;
Pout << "Rep = " << Rep << endl;
Pout << "Cd = " << Cd << endl;
Pout << "drag (total) = " << drag << endl;
if(splitImplicitExplicit_)
{
Pout << "UfluidFluct = " << UfluidFluct << endl;
Pout << "UsFluct = " << UsFluct << endl;
Pout << "dragExplicit = " << dragExplicit << endl;
}
}
//Set value fields and write the probe
if(probeIt_)
{
#include "setupProbeModelfields.H"
vValues.append(drag); //first entry must the be the force
vValues.append(Ur);
sValues.append(Rep);
sValues.append(Cd);
sValues.append(voidfraction);
particleCloud_.probeM().writeProbe(index, sValues, vValues);
}
}
// set force on particle
if(treatExplicit_) for(int j=0;j<3;j++) expForces()[index][j] += drag[j];
else //implicit treatment, taking explicit force contribution into account
{
for(int j=0;j<3;j++)
{
impForces()[index][j] += drag[j] - dragExplicit[j]; //only consider implicit part!
expForces()[index][j] += dragExplicit[j];
}
}
for(int j=0;j<3;j++) DEMForces()[index][j] += drag[j];
}
//}
}
void DiFeliceDrag::setForce() const
{
// get viscosity field
#ifdef comp
const volScalarField nufField = particleCloud_.turbulence().mu() / rho_;
#else
const volScalarField& nufField = particleCloud_.turbulence().nu();
#endif
vector position(0,0,0);
scalar voidfraction(1);
vector Ufluid(0,0,0);
vector drag(0,0,0);
label cellI=0;
vector Us(0,0,0);
vector Ur(0,0,0);
scalar ds(0);
scalar nuf(0);
scalar rho(0);
scalar magUr(0);
scalar Rep(0);
scalar Cd(0);
interpolationCellPoint<scalar> voidfractionInterpolator_(voidfraction_);
interpolationCellPoint<vector> UInterpolator_(U_);
#include "setupProbeModel.H"
for(int index = 0;index < particleCloud_.numberOfParticles(); index++)
{
//if(mask[index][0])
//{
cellI = particleCloud_.cellIDs()[index][0];
drag = vector(0,0,0);
if (cellI > -1) // particle Found
{
if(interpolation_)
{
position = particleCloud_.position(index);
voidfraction = voidfractionInterpolator_.interpolate(position,cellI);
Ufluid = UInterpolator_.interpolate(position,cellI);
}else
{
voidfraction = voidfraction_[cellI];
Ufluid = U_[cellI];
}
Us = particleCloud_.velocity(index);
Ur = Ufluid-Us;
ds = 2*particleCloud_.radius(index);
nuf = nufField[cellI];
rho = rho_[cellI];
magUr = mag(Ur);
Rep = 0;
Cd = 0;
if (magUr > 0)
{
// calc particle Re Nr
Rep = ds*voidfraction*magUr/(nuf+SMALL);
// calc fluid drag Coeff
Cd = sqr(0.63 + 4.8/sqrt(Rep));
// calc model coefficient Xi
scalar Xi = 3.7 - 0.65 * exp(-sqr(1.5-log10(Rep))/2);
// calc particle's drag
drag = 0.125*Cd*rho*M_PI*ds*ds*pow(voidfraction,(2-Xi))*magUr*Ur;
if (modelType_=="B")
drag /= voidfraction;
}
if(verbose_ && index >100 && index <102)
{
Pout << "index = " << index << endl;
Pout << "Us = " << Us << endl;
Pout << "Ur = " << Ur << endl;
Pout << "ds = " << ds << endl;
Pout << "rho = " << rho << endl;
Pout << "nuf = " << nuf << endl;
Pout << "voidfraction = " << voidfraction << endl;
Pout << "Rep = " << Rep << endl;
Pout << "Cd = " << Cd << endl;
Pout << "drag = " << drag << endl;
}
//Set value fields and write the probe
if(probeIt_)
{
#include "setupProbeModelfields.H"
vValues.append(drag); //first entry must the be the force
vValues.append(Ur);
sValues.append(Rep);
sValues.append(Cd);
sValues.append(voidfraction);
particleCloud_.probeM().writeProbe(index, sValues, vValues);
}
}
// set force on particle
if(treatExplicit_) for(int j=0;j<3;j++) expForces()[index][j] += drag[j];
else for(int j=0;j<3;j++) impForces()[index][j] += drag[j];
for(int j=0;j<3;j++) DEMForces()[index][j] += drag[j];
}
//}
}
void KochHillDrag::setForce() const
{
if (scaleDia_ > 1)
Info << "KochHill using scale = " << scaleDia_ << endl;
else if (particleCloud_.cg() > 1){
scaleDia_=particleCloud_.cg();
Info << "KochHill using scale from liggghts cg = " << scaleDia_ << endl;
}
// get viscosity field
#ifdef comp
const volScalarField nufField = particleCloud_.turbulence().mu()/rho_;
#else
const volScalarField& nufField = particleCloud_.turbulence().nu();
#endif
vector position(0,0,0);
scalar voidfraction(1);
vector Ufluid(0,0,0);
vector drag(0,0,0);
label cellI=0;
vector Us(0,0,0);
vector Ur(0,0,0);
scalar ds(0);
scalar nuf(0);
scalar rho(0);
scalar magUr(0);
scalar Rep(0);
scalar Vs(0);
scalar volumefraction(0);
scalar betaP(0);
interpolationCellPoint<scalar> voidfractionInterpolator_(voidfraction_);
interpolationCellPoint<vector> UInterpolator_(U_);
#include "setupProbeModel.H"
for(int index = 0;index < particleCloud_.numberOfParticles(); index++)
{
//if(mask[index][0])
//{
cellI = particleCloud_.cellIDs()[index][0];
drag = vector(0,0,0);
betaP = 0;
Vs = 0;
Ufluid =vector(0,0,0);
voidfraction=0;
if (cellI > -1) // particle Found
{
if(interpolation_)
{
position = particleCloud_.position(index);
voidfraction = voidfractionInterpolator_.interpolate(position,cellI);
Ufluid = UInterpolator_.interpolate(position,cellI);
//Ensure interpolated void fraction to be meaningful
// Info << " --> voidfraction: " << voidfraction << endl;
if(voidfraction>1.00) voidfraction = 1.00;
if(voidfraction<0.40) voidfraction = 0.40;
}else
{
voidfraction = voidfraction_[cellI];
Ufluid = U_[cellI];
}
Us = particleCloud_.velocity(index);
Ur = Ufluid-Us;
ds = particleCloud_.d(index);
nuf = nufField[cellI];
rho = rho_[cellI];
magUr = mag(Ur);
Rep = 0;
Vs = ds*ds*ds*M_PI/6;
volumefraction = 1-voidfraction+SMALL;
if (magUr > 0)
{
// calc particle Re Nr
Rep = ds/scaleDia_*voidfraction*magUr/(nuf+SMALL);
// calc model coefficient F0
scalar F0=0.;
if(volumefraction < 0.4)
{
F0 = (1+3*sqrt((volumefraction)/2)+135/64*volumefraction*log(volumefraction)
+16.14*volumefraction
)/
(1+0.681*volumefraction-8.48*sqr(volumefraction)
+8.16*volumefraction*volumefraction*volumefraction
);
} else {
F0 = 10*volumefraction/(voidfraction*voidfraction*voidfraction);
}
// calc model coefficient F3
scalar F3 = 0.0673+0.212*volumefraction+0.0232/pow(voidfraction,5);
//Calculate F
scalar F = voidfraction * (F0 + 0.5*F3*Rep);
// calc drag model coefficient betaP
betaP = 18.*nuf*rho/(ds/scaleDia_*ds/scaleDia_)*voidfraction*F;
// calc particle's drag
drag = Vs*betaP*Ur*scaleDrag_;
if (modelType_=="B")
drag /= voidfraction;
}
if(verbose_ && index >=0 && index <2)
{
Pout << "cellI = " << cellI << endl;
Pout << "index = " << index << endl;
Pout << "Us = " << Us << endl;
Pout << "Ur = " << Ur << endl;
Pout << "ds = " << ds << endl;
Pout << "ds/scale = " << ds/scaleDia_ << endl;
Pout << "rho = " << rho << endl;
Pout << "nuf = " << nuf << endl;
Pout << "voidfraction = " << voidfraction << endl;
Pout << "Rep = " << Rep << endl;
Pout << "betaP = " << betaP << endl;
Pout << "drag = " << drag << endl;
}
//Set value fields and write the probe
if(probeIt_)
{
#include "setupProbeModelfields.H"
vValues.append(drag); //first entry must the be the force
vValues.append(Ur);
sValues.append(Rep);
sValues.append(betaP);
sValues.append(voidfraction);
particleCloud_.probeM().writeProbe(index, sValues, vValues);
}
}
// set force on particle
if(treatExplicit_) for(int j=0;j<3;j++) expForces()[index][j] += drag[j];
else for(int j=0;j<3;j++) impForces()[index][j] += drag[j];
// set Cd
if(implDEM_)
{
for(int j=0;j<3;j++) fluidVel()[index][j]=Ufluid[j];
if (modelType_=="B" && cellI > -1)
Cds()[index][0] = Vs*betaP/voidfraction*scaleDrag_;
else
Cds()[index][0] = Vs*betaP*scaleDrag_;
}else{
for(int j=0;j<3;j++) DEMForces()[index][j] += drag[j];
}
//}
}
}
int main(int argc, char *argv[])
{
timeSelector::addOptions();
# include "addRegionOption.H"
argList::addBoolOption
(
"noWrite",
"suppress writing results"
);
#include "addDictOption.H"
#include "setRootCase.H"
#include "createTime.H"
instantList timeDirs = timeSelector::select0(runTime, args);
#include "createNamedMesh.H"
#include "createFields.H"
// Create particle cloud
cfdemCloud particleCloud(mesh);
// Post-processing dictionary
#include "postProcessingDict.H"
// Create conditional averaging class
conditionalAve condAve(postProcessingDict,conditionalAveragingDict,
mesh,nVariable,nAveragingVariable,nTotalCase,conditionalAveraging);
// Create multiple variable conditional averaging class
multipleVarsConditionalAve multipleVarsCondAve(postProcessingDict,multConditionalAveragingDict,
mesh,multNVariable,multNAveragingVariable,multNTotalCase,multConditionalAveraging);
forAll(timeDirs, timeI)
{
runTime.setTime(timeDirs[timeI], timeI);
Pout << " " << endl;
Pout << "\nTime = " << runTime.timeName() << endl;
mesh.readUpdate();
// Read gas volume fraction
IOobject voidfractionheader
(
"voidfraction",
runTime.timeName(),
mesh,
IOobject::MUST_READ
);
Info<< " Reading voidfraction" << endl;
volScalarField voidfraction(voidfractionheader,mesh);
// Read Eulerian particle velocity
IOobject Usheader
(
"Us",
runTime.timeName(),
mesh,
IOobject::MUST_READ
);
Info<< " Reading Us" << endl;
volVectorField Us(Usheader,mesh);
// Read particle kinetic stresses
IOobject sigmaKinHeader
(
"sigmaKin",
runTime.timeName(),
mesh,
IOobject::MUST_READ
);
Info<< " Reading sigmaKin" << endl;
volSymmTensorField sigmaKin(sigmaKinHeader,mesh);
// Read particle collisional stresses
IOobject sigmaCollHeader
(
"sigmaColl",
runTime.timeName(),
mesh,
IOobject::MUST_READ
);
Info<< " Reading sigmaColl" << endl;
volSymmTensorField sigmaColl(sigmaCollHeader,mesh);
// Particle pressure
volScalarField Pp
(
IOobject
(
"Pp",
runTime.timeName(),
mesh,
IOobject::NO_READ,
IOobject::AUTO_WRITE
),
mesh,
dimensionedScalar( "zero", dimensionSet(1,-1,-2,0,0), scalar(0) )
);
Pp = 1./3. * tr( sigmaKin + sigmaColl ) ;
// Write into the results folder
Pp.write();
// Calculate the particulate pressure gradient
volVectorField gradPp(fvc::grad(Pp));
// Particle shear stress
volTensorField sigmap
(
IOobject
(
"sigmap",
runTime.timeName(),
mesh,
IOobject::NO_READ,
IOobject::AUTO_WRITE
),
mesh,
dimensionedTensor( "zero", dimensionSet(1,-1,-2,0,0), tensor(0,0,0,0,0,0,0,0,0) )
);
sigmap = ( sigmaKin + sigmaColl ) - tensor(I) * Pp;
// Write into the results folder
sigmap.write();
// Particle viscosity
volScalarField mup
(
IOobject
(
"mup",
runTime.timeName(),
mesh,
IOobject::NO_READ,
IOobject::AUTO_WRITE
),
mesh,
dimensionedScalar( "zero", dimensionSet(1,-1,-1,0,0), scalar(0) )
);
// Particle shear stresses
volTensorField S("S",fvc::grad(Us) + fvc::grad(Us)().T());
dimensionedScalar SSsmall("zero", dimensionSet(0,0,-2,0,0,0,0), SMALL);
mup = ( sigmap && S ) / ( max ( S && S, SSsmall ) );
// Limit by zero
mup.max(0.);
// Write into the results folder
mup.write();
// Particle viscosity/sqrt(p)
dimensionedScalar PpSmall("zero", dimensionSet(1,-1,-2,0,0,0,0), 1.e-06);
volScalarField mupSqrtPp
(
IOobject
(
"mupSqrtPp",
runTime.timeName(),
mesh,
IOobject::NO_READ,
IOobject::AUTO_WRITE
),
mup/sqrt((mag(Pp)+PpSmall)*rhop)/dp
);
//- Dummy word
word varName("");
//- Conditional averaging
condAve.calc();
condAve.write(varName);
//- Multi-variable conditional averaging
multipleVarsCondAve.calc();
multipleVarsCondAve.write(varName);
}
