void CalculateDragForce
(
cfdemCloud& sm,
const volScalarField& alpf_,
const volVectorField& Uf_,
const volScalarField& rho_,
const bool& verbose_,
vectorField& DragForce_,
const labelListList& particleList_
)
{
// get viscosity field
#ifdef comp
const volScalarField nufField = sm.turbulence().mu()/rho_;
#else
const volScalarField& nufField = sm.turbulence().nu();
#endif
// Local variables
label cellI(-1);
vector drag(0,0,0);
vector Ufluid(0,0,0);
vector position(0,0,0);
scalar voidfraction(1);
vector Up(0,0,0);
vector Ur(0,0,0);
scalar ds(0);
scalar nuf(0);
scalar rhof(0);
vector WenYuDrag(0,0,0);
interpolationCellPoint<scalar> voidfractionInterpolator_(alpf_);
interpolationCellPoint<vector> UInterpolator_(Uf_);
//
//_AO_Parallel
DragForce_.resize(particleList_.size());
for(int ii =0; ii < particleList_.size(); ii++)
{
int index = particleList_[ii][0];
cellI = sm.cellIDs()[index][0];
drag = vector(0,0,0);
Ufluid = vector(0,0,0);
WenYuDrag = vector(0,0,0);
DragForce_[ii] = vector(0,0,0);
if (cellI > -1) // particle Found
{
position = sm.position(index);
if ( alpf_[cellI] > 1. ) Pout << " voidfraction > 1 " << alpf_[cellI] << endl;
voidfraction = voidfractionInterpolator_.interpolate(position,cellI);
Ufluid = UInterpolator_.interpolate(position,cellI);
if ( voidfraction > 1. )
{
Pout << " Int. voidfraction > 1 " << " value= " << voidfraction;
voidfraction = alpf_[cellI];
Pout << " mod. value = " << voidfraction << endl;
}
Up = sm.velocity(index);
Ur = Ufluid-Up;
ds = 2*sm.radius(index);
rhof = rho_[cellI];
nuf = nufField[cellI];
// Drag force
WenYuDragForce(Ur,ds,rhof,nuf,voidfraction,WenYuDrag);
if(verbose_ && index <= 1)
{
Info << "" << endl;
Pout << " index = " << index << endl;
Pout << " position = " << position << endl;
Pout << " Up = " << Up << endl;
Pout << " Ur = " << Ur << endl;
Pout << " dp = " << ds << endl;
Pout << " rho = " << rhof << endl;
Pout << " nuf = " << nuf << endl;
Pout << " voidfraction = " << voidfraction << endl;
Pout << " drag = " << WenYuDrag << endl;
Info << " " << endl;
}
}
for(int j=0;j<3;j++) DragForce_[ii][j] = WenYuDrag[j];
}
}
void EulerianParticleVelocityForce
(
cfdemCloud& sm,
const fvMesh& mesh,
volVectorField& Uf_,
volVectorField& Up_,
volScalarField& rho_,
volScalarField& alpf_,
volScalarField& Pg_,
volVectorField& MappedDragForce_,
const labelListList& particleList_,
const bool& weighting_
)
{
// Neighbouring cells
CPCCellToCellStencil neighbourCells(mesh);
// get viscosity field
#ifdef comp
const volScalarField nufField = sm.turbulence().mu()/rho_;
#else
const volScalarField& nufField = sm.turbulence().nu();
#endif
// Gas pressure gradient
volVectorField gradPg_ = fvc::grad(Pg_);
interpolationCellPoint<vector> gradPgInterpolator_(gradPg_);
// Local variables
label cellID(-1);
vector drag(0,0,0);
vector Ufluid(0,0,0);
vector position(0,0,0);
scalar voidfraction(1);
vector Up(0,0,0);
vector Ur(0,0,0);
scalar ds(0);
scalar nuf(0);
scalar rhof(0);
vector WenYuDrag(0,0,0);
interpolationCellPoint<scalar> voidfractionInterpolator_(alpf_);
interpolationCellPoint<vector> UInterpolator_(Uf_);
scalar dist_s(0);
scalar sumWeights(0);
scalarField weightScalar(27,scalar(0.0));
Field <Field <scalar> > particleWeights(particleList_.size(),weightScalar);
//Info << " particle size " << particleList_.size() << endl;
// Number of particle in a cell
scalarField np(mesh.cells().size(),scalar(0));
// Particle volume
scalar Volp(0);
vector gradPg_int(0,0,0);
for(int ii = 0; ii < particleList_.size(); ii++)
{
int index = particleList_[ii][0];
cellID = sm.cellIDs()[index][0];
position = sm.position(index);
Ufluid = UInterpolator_.interpolate(position,cellID);
Up = sm.velocity(index);
Ur = Ufluid-Up;
ds = 2*sm.radius(index);
// Calculate WenYu Drag
voidfraction = voidfractionInterpolator_.interpolate(position,cellID);
nuf = nufField[cellID];
rhof = rho_[cellID];
WenYuDragForce(Ur,ds,rhof,nuf,voidfraction,WenYuDrag);
Volp = ds*ds*ds*M_PI/6;
gradPg_int = gradPgInterpolator_.interpolate(position,cellID);
//if (cellID > -1) // particle centre is in domain
//{
if(weighting_)
{
labelList& cellsNeigh = neighbourCells[cellID];
sumWeights = 0;
dist_s = 0;
//Info << " index = " << index << " ii = " << ii << " cellID = " << cellID << endl;
forAll(cellsNeigh,jj)
{
// Find distances between particle and neighbouring cells
dist_s = mag(sm.mesh().C()[cellsNeigh[jj]]-position)/pow(sm.mesh().V()[cellsNeigh[jj]],1./3.);
if(dist_s <= 0.5)
{
particleWeights[ii][jj] = 1./4.*pow(dist_s,4)-5./8.*pow(dist_s,2)+115./192.;
}
else if (dist_s > 0.5 && dist_s <= 1.5)
{
particleWeights[ii][jj] = -1./6.*pow(dist_s,4)+5./6.*pow(dist_s,3)-5./4.*pow(dist_s,2)+5./24.*dist_s+55./96.;
}
else if (dist_s > 1.5 && dist_s <= 2.5)
{
particleWeights[ii][jj] = pow(2.5-dist_s,4)/24.;
}
else
{
particleWeights[ii][jj] = 0;
}
sumWeights += particleWeights[ii][jj];
}
forAll(cellsNeigh,jj)
{
if ( sumWeights != 0 )
{
Up_[cellID] += Up*particleWeights[ii][jj]/sumWeights;
MappedDragForce_[cellID] += (WenYuDrag + Volp * gradPg_int) * particleWeights[ii][jj]/sumWeights;
}
else
{
Up_[cellID] = vector(0,0,0);
MappedDragForce_[cellID] = vector(0,0,0);
}
}
}
else
{
