void Foam::MarshakRadiationFvPatchScalarField::updateCoeffs()
{
if (this->updated())
{
return;
}
// Since we're inside initEvaluate/evaluate there might be processor
// comms underway. Change the tag we use.
int oldTag = UPstream::msgType();
UPstream::msgType() = oldTag+1;
// Temperature field
const scalarField& Tp =
patch().lookupPatchField<volScalarField, scalar>(TName_);
// Re-calc reference value
refValue() = 4.0*constant::physicoChemical::sigma.value()*pow4(Tp);
// Diffusion coefficient - created by radiation model's ::updateCoeffs()
const scalarField& gamma =
patch().lookupPatchField<volScalarField, scalar>("gammaRad");
const scalarField temissivity = emissivity();
const scalarField Ep(temissivity/(2.0*(2.0 - temissivity)));
// Set value fraction
valueFraction() = 1.0/(1.0 + gamma*patch().deltaCoeffs()/Ep);
// Restore tag
UPstream::msgType() = oldTag;
mixedFvPatchScalarField::updateCoeffs();
}
Foam::scalarField Foam::radiationCoupledBase::emissivity() const
{
switch (method_)
{
case SOLIDRADIATION:
{
// Get the coupling information from the mappedPatchBase
const mappedPatchBase& mpp =
refCast<const mappedPatchBase>(patch_.patch());
const polyMesh& nbrMesh = mpp.sampleMesh();
const radiation::radiationModel& radiation =
nbrMesh.lookupObject<radiation::radiationModel>
(
"radiationProperties"
);
const fvMesh& nbrFvMesh = refCast<const fvMesh>(nbrMesh);
const fvPatch& nbrPatch =
nbrFvMesh.boundary()[mpp.samplePolyPatch().index()];
scalarField emissivity
(
radiation.absorptionEmission().e()().boundaryField()
[
nbrPatch.index()
]
);
mpp.distribute(emissivity);
return emissivity;
}
break;
case LOOKUP:
{
// return local value
return emissivity_;
}
default:
{
FatalErrorInFunction
<< "Unimplemented method " << method_ << endl
<< "Please set 'emissivity' to one of "
<< emissivityMethodTypeNames_.toc()
<< exit(FatalError);
}
break;
}
return scalarField(0);
}
bool
MAST::HeatConductionElementBase::
surface_radiation_residual(bool request_jacobian,
RealVectorX& f,
RealMatrixX& jac,
MAST::BoundaryConditionBase& p) {
// get the function from this boundary condition
const MAST::FieldFunction<Real>
&emissivity = p.get<MAST::FieldFunction<Real> >("emissivity");
const MAST::Parameter
&T_amb = p.get<MAST::Parameter>("ambient_temperature"),
&T_ref_zero = p.get<MAST::Parameter>("reference_zero_temperature"),
&sb_const = p.get<MAST::Parameter>("stefan_bolzmann_constant");
const std::vector<Real> &JxW = _fe->get_JxW();
const std::vector<libMesh::Point>& qpoint = _fe->get_xyz();
const std::vector<std::vector<Real> >& phi = _fe->get_phi();
const unsigned int n_phi = (unsigned int)phi.size();
RealVectorX phi_vec = RealVectorX::Zero(n_phi);
RealMatrixX mat = RealMatrixX::Zero(n_phi, n_phi);
const Real
sbc = sb_const(),
amb_temp = T_amb(),
zero_ref = T_ref_zero();
Real temp, emiss;
libMesh::Point pt;
MAST::FEMOperatorMatrix Bmat;
for (unsigned int qp=0; qp<qpoint.size(); qp++) {
_local_elem->global_coordinates_location (qpoint[qp], pt);
// now set the shape function values
for ( unsigned int i_nd=0; i_nd<n_phi; i_nd++ )
phi_vec(i_nd) = phi[i_nd][qp];
// value of flux
emissivity(pt, _time, emiss);
temp = phi_vec.dot(_sol);
f += JxW[qp] * phi_vec * sbc * emiss *
(pow(temp-zero_ref, 4.) - pow(amb_temp-zero_ref, 4.));
if (request_jacobian) {
Bmat.reinit(1, phi_vec);
Bmat.right_multiply_transpose(mat, Bmat);
jac += JxW[qp] * mat * sbc * emiss * 4. * pow(temp-zero_ref, 3.);
}
}
return request_jacobian;
}
Foam::scalarField Foam::radiationCoupledBase::emissivity() const
{
switch (method_)
{
case SOLIDTHERMO:
{
// Get the coupling information from the directMappedPatchBase
const directMappedPatchBase& mpp =
refCast<const directMappedPatchBase>
(
patch_.patch()
);
const polyMesh& nbrMesh = mpp.sampleMesh();
// Force recalculation of mapping and schedule
const mapDistribute& distMap = mpp.map();
const fvPatch& nbrPatch = refCast<const fvMesh>
(
nbrMesh
).boundary()[mpp.samplePolyPatch().index()];
if (nbrMesh.foundObject<volScalarField>("emissivity"))
{
tmp<scalarField> temissivity
(
new scalarField
(
nbrPatch.lookupPatchField<volScalarField, scalar>
(
"emissivity"
)
)
);
scalarField emissivity(temissivity);
// Use direct map mapping to exchange data
distMap.distribute(emissivity);
//Pout << emissivity << endl;
return emissivity;
}
else
{
return scalarField(0);
}
}
break;
case LOOKUP:
{
// return local value
return emissivity_;
}
default:
{
FatalErrorIn
(
"radiationCoupledBase::emissivity(const scalarField&)"
)
<< "Unimplemented method " << method_ << endl
<< "Please set 'emissivity' to one of "
<< emissivityMethodTypeNames_.toc()
<< " and 'emissivityName' to the name of the volScalar"
<< exit(FatalError);
}
break;
}
return scalarField(0);
}
