mirror of
https://develop.openfoam.com/Development/openfoam.git
synced 2025-11-28 03:28:01 +00:00
Changing FreeStream to create inflow on all patches of type patch. Implemented Bird eqn 4.22 for the number flux and eqn 12.5 for the velocity distibution. Drawing T and U for the FreeStream from the boundaryT and boundaryU fields.
This commit is contained in:
graham
@ -91,7 +91,7 @@ int main(int argc, char *argv[])
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runTime.write();
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Info<< "ExecutionTime = " << runTime.elapsedCpuTime() << " s"
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Info<< nl << "ExecutionTime = " << runTime.elapsedCpuTime() << " s"
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<< " ClockTime = " << runTime.elapsedClockTime() << " s"
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<< nl << endl;
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}
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@ -37,6 +37,7 @@ Foam::scalar Foam::DsmcCloud<ParcelType>::kb = 1.380650277e-23;
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template<class ParcelType>
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Foam::scalar Foam::DsmcCloud<ParcelType>::Tref = 273;
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// * * * * * * * * * * * * * Private Member Functions * * * * * * * * * * * //
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template<class ParcelType>
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@ -625,6 +626,13 @@ Foam::DsmcCloud<ParcelType>::DsmcCloud
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buildConstProps();
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buildCellOccupancy();
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// Initialise the collision selection remainder to a random value between 0
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// and 1.
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forAll(collisionSelectionRemainder_, i)
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{
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collisionSelectionRemainder_[i] = rndGen_.scalar01();
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}
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}
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@ -813,8 +821,12 @@ void Foam::DsmcCloud<ParcelType>::info() const
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Info<< "Cloud name: " << this->name() << nl
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<< " Number of dsmc particles = "
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<< nDsmcParticles << nl
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<< " Number of molecules = "
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<< nDsmcParticles
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<< endl;
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if (nDsmcParticles)
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{
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Info<< " Number of molecules = "
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<< nMol << nl
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<< " Mass in system = "
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<< returnReduce(massInSystem(), sumOp<scalar>()) << nl
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@ -827,8 +839,9 @@ void Foam::DsmcCloud<ParcelType>::info() const
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<< " Average internal energy = "
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<< internalEnergy/nMol << nl
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<< " Average total energy = "
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<< (internalEnergy + linearKineticEnergy)/nMol << nl
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<< (internalEnergy + linearKineticEnergy)/nMol
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<< endl;
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}
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}
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@ -874,7 +887,7 @@ Foam::scalar Foam::DsmcCloud<ParcelType>::equipartitionInternalEnergy
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scalar energyRatio;
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scalar P;
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scalar P = -1;
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do
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{
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@ -299,6 +299,12 @@ public:
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scalar mass
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) const;
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inline scalarField maxwellianAverageSpeed
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(
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scalarField temperature,
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scalar mass
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) const;
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//- RMS particle speed
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inline scalar maxwellianRMSSpeed
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(
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@ -306,6 +312,12 @@ public:
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scalar mass
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) const;
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inline scalarField maxwellianRMSSpeed
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(
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scalarField temperature,
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scalar mass
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) const;
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//- Most probable speed
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inline scalar maxwellianMostProbableSpeed
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(
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@ -313,6 +325,11 @@ public:
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scalar mass
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) const;
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inline scalarField maxwellianMostProbableSpeed
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(
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scalarField temperature,
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scalar mass
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) const;
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// Sub-models
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@ -302,6 +302,17 @@ inline Foam::scalar Foam::DsmcCloud<ParcelType>::maxwellianAverageSpeed
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}
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template<class ParcelType>
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inline Foam::scalarField Foam::DsmcCloud<ParcelType>::maxwellianAverageSpeed
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(
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scalarField temperature,
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scalar mass
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) const
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{
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return 2.0*sqrt(2.0*kb*temperature/(mathematicalConstant::pi*mass));
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}
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template<class ParcelType>
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inline Foam::scalar Foam::DsmcCloud<ParcelType>::maxwellianRMSSpeed
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(
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@ -313,6 +324,17 @@ inline Foam::scalar Foam::DsmcCloud<ParcelType>::maxwellianRMSSpeed
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}
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template<class ParcelType>
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inline Foam::scalarField Foam::DsmcCloud<ParcelType>::maxwellianRMSSpeed
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(
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scalarField temperature,
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scalar mass
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) const
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{
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return sqrt(3.0*kb*temperature/mass);
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}
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template<class ParcelType>
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inline Foam::scalar
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Foam::DsmcCloud<ParcelType>::maxwellianMostProbableSpeed
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@ -325,6 +347,18 @@ Foam::DsmcCloud<ParcelType>::maxwellianMostProbableSpeed
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}
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template<class ParcelType>
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inline Foam::scalarField
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Foam::DsmcCloud<ParcelType>::maxwellianMostProbableSpeed
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(
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scalarField temperature,
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scalar mass
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) const
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{
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return sqrt(2.0*kb*temperature/mass);
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}
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template<class ParcelType>
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inline const Foam::tmp<Foam::volScalarField>
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Foam::DsmcCloud<ParcelType>::rhoN() const
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@ -36,31 +36,26 @@ Foam::FreeStream<CloudType>::FreeStream
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)
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:
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InflowBoundaryModel<CloudType>(dict, cloud, typeName),
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patchIndex_(),
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temperature_(readScalar(this->coeffDict().lookup("temperature"))),
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velocity_(this->coeffDict().lookup("velocity")),
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patches_(),
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moleculeTypeIds_(),
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numberDensities_(),
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particleFluxAccumulators_()
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{
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word patchName = this->coeffDict().lookup("patch");
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// Identify which patches to use
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patchIndex_ = cloud.mesh().boundaryMesh().findPatchID(patchName);
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DynamicList<label> patches;
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const polyPatch& patch = cloud.mesh().boundaryMesh()[patchIndex_];
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if (patchIndex_ == -1)
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forAll(cloud.mesh().boundaryMesh(), p)
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{
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FatalErrorIn
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(
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"Foam::FreeStream<CloudType>::FreeStream"
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"("
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"const dictionary&, "
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"CloudType&"
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")"
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) << "patch " << patchName << " not found." << nl
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<< abort(FatalError);
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const polyPatch& patch = cloud.mesh().boundaryMesh()[p];
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if (patch.type() == polyPatch::typeName)
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{
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patches.append(p);
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}
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}
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patches_.transfer(patches);
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const dictionary& numberDensitiesDict
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(
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@ -69,10 +64,24 @@ Foam::FreeStream<CloudType>::FreeStream
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List<word> molecules(numberDensitiesDict.toc());
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numberDensities_.setSize(molecules.size());
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// Initialise the particleFluxAccumulators_
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particleFluxAccumulators_.setSize(patches_.size());
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forAll(patches_, p)
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{
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const polyPatch& patch = cloud.mesh().boundaryMesh()[patches_[p]];
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particleFluxAccumulators_[p] = List<Field<scalar> >
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(
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molecules.size(),
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Field<scalar>(patch.size(), 0.0)
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);
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}
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moleculeTypeIds_.setSize(molecules.size());
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numberDensities_.setSize(molecules.size());
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forAll(molecules, i)
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{
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numberDensities_[i] = readScalar
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@ -97,12 +106,6 @@ Foam::FreeStream<CloudType>::FreeStream
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}
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numberDensities_ /= cloud.nParticle();
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particleFluxAccumulators_.setSize
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(
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molecules.size(),
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Field<scalar>(patch.size(), 0)
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);
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}
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@ -127,17 +130,65 @@ void Foam::FreeStream<CloudType>::inflow()
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Random& rndGen(cloud.rndGen());
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const polyPatch& patch = mesh.boundaryMesh()[patchIndex_];
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scalar sqrtPi = sqrt(mathematicalConstant::pi);
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label particlesInserted = 0;
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const volScalarField::GeometricBoundaryField& boundaryT
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(
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cloud.T().boundaryField()
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);
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const volVectorField::GeometricBoundaryField& boundaryU
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(
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cloud.U().boundaryField()
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);
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forAll(patches_, p)
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{
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label patchI = patches_[p];
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const polyPatch& patch = mesh.boundaryMesh()[patchI];
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// Add mass to the accumulators. negative face area dotted with the
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// velocity to point flux into the domain.
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forAll(particleFluxAccumulators_, i)
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// Take a reference to the particleFluxAccumulator for this patch
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List<Field<scalar> >& pFA = particleFluxAccumulators_[p];
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forAll(pFA, i)
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{
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particleFluxAccumulators_[i] +=
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-patch.faceAreas() & (velocity_*numberDensities_[i]*deltaT);
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label typeId = moleculeTypeIds_[i];
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scalar mass = cloud.constProps(typeId).mass();
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scalarField mostProbableSpeed
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(
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cloud.maxwellianMostProbableSpeed
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(
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boundaryT[patchI],
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mass
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)
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);
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// Dotting boundary velocity with the face unit normal (which points
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// out of the domain, so it must be negated), dividing by the most
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// probable speed to form molecularSpeedRatio * cosTheta
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scalarField sCosTheta =
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boundaryU[patchI]
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& -patch.faceAreas()/mag(patch.faceAreas())
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/mostProbableSpeed;
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// From Bird eqn 4.22
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pFA[i] +=
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mag(patch.faceAreas()) * numberDensities_[i] * deltaT
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*mostProbableSpeed
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*(
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exp(-sqr(sCosTheta)) + sqrtPi*sCosTheta*(1 + erf(sCosTheta))
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)
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/(2.0*sqrtPi);
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}
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forAll(patch, f)
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@ -177,22 +228,26 @@ void Foam::FreeStream<CloudType>::inflow()
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// Normal unit vector *negative* so normal is pointing into the
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// domain
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vector nw = patch.faceAreas()[f];
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nw /= -mag(nw);
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vector n = patch.faceAreas()[f];
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n /= -mag(n);
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// Wall tangential unit vector. Use the direction between the
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// face centre and the first vertex in the list
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vector tw1 = fC - (mesh.points()[faceVertices[0]]);
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tw1 /= mag(tw1);
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vector t1 = fC - (mesh.points()[faceVertices[0]]);
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t1 /= mag(t1);
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// Other tangential unit vector. Rescaling in case face is not
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// flat and nw and tw1 aren't perfectly orthogonal
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vector tw2 = nw^tw1;
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tw2 /= mag(tw2);
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// flat and n and t1 aren't perfectly orthogonal
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vector t2 = n^t1;
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t2 /= mag(t2);
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forAll(particleFluxAccumulators_, i)
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scalar faceTemperature = boundaryT[patchI][f];
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const vector& faceVelocity = boundaryU[patchI][f];
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forAll(pFA, i)
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{
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scalar& faceAccumulator = particleFluxAccumulators_[i][f];
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scalar& faceAccumulator = pFA[i][f];
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// Number of particles to insert
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label nI = max(label(faceAccumulator), 0);
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@ -203,9 +258,10 @@ void Foam::FreeStream<CloudType>::inflow()
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scalar mass = cloud.constProps(typeId).mass();
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for (label n = 0; n < nI; n++)
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for (label i = 0; i < nI; i++)
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{
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// Choose a triangle to insert on, based on their relative area
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// Choose a triangle to insert on, based on their relative
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// area
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scalar triSelection = rndGen.scalar01();
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@ -239,19 +295,74 @@ void Foam::FreeStream<CloudType>::inflow()
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point p = (1 - t)*A + (1 - s)*t*B + s*t*C;
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vector U =
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sqrt(CloudType::kb*temperature_/mass)
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*(
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rndGen.GaussNormal()*tw1
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+ rndGen.GaussNormal()*tw2
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- sqrt(-2.0*log(max(1 - rndGen.scalar01(), VSMALL)))*nw
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// Velocity generation
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scalar mostProbableSpeed
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(
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cloud.maxwellianMostProbableSpeed
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(
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faceTemperature,
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mass
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)
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);
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U += velocity_;
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scalar sCosTheta = (faceVelocity & n)/mostProbableSpeed;
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// Coefficients required for Bird eqn 12.5
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scalar uNormProbCoeffA =
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sCosTheta + sqrt(sqr(sCosTheta) + 2.0);
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scalar uNormProbCoeffB =
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0.5*
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(
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1.0
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+ sCosTheta*(sCosTheta - sqrt(sqr(sCosTheta) + 2.0))
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);
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// Equivalent to the QA value in Bird's DSMC3.FOR
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scalar randomScaling = 3.0;
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if (sCosTheta < -3)
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{
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randomScaling = mag(sCosTheta) + 1;
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}
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scalar P = -1;
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// Normalised candidates for the normal direction velocity
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// component
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scalar uNormal;
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scalar uNormalThermal;
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// Select a velocity using Bird eqn 12.5
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do
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{
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uNormalThermal =
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randomScaling*(2.0*rndGen.scalar01() - 1);
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uNormal = uNormalThermal + sCosTheta;
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if (uNormal < 0.0)
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{
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continue;
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}
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P = 2.0*uNormal/uNormProbCoeffA
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*exp(uNormProbCoeffB - sqr(uNormalThermal));
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} while (P < rndGen.scalar01());
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vector U =
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sqrt(CloudType::kb*faceTemperature/mass)
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*(
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rndGen.GaussNormal()*t1
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+ rndGen.GaussNormal()*t2
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)
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+ mostProbableSpeed*uNormal*n;
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scalar Ei = cloud.equipartitionInternalEnergy
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(
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temperature_,
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faceTemperature,
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cloud.constProps(typeId).internalDegreesOfFreedom()
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);
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@ -268,6 +379,7 @@ void Foam::FreeStream<CloudType>::inflow()
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}
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}
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}
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}
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reduce(particlesInserted, sumOp<label>());
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@ -26,8 +26,10 @@ Class
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Foam::FreeStream
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Description
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Inserting new particles across the faces of a specified patch for a free
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stream. Uniform values of temperature, velocity and number densities
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Inserting new particles across the faces of a all patched of type
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"patch" for a free stream. Uniform values number density, temperature
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and velocity sourced face-by-face from the boundaryT and boundaryU fields
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of the cloud.
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\*---------------------------------------------------------------------------*/
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@ -52,14 +54,8 @@ class FreeStream
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{
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// Private data
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//- Index of patch to introduce particles across
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label patchIndex_;
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//- Temperature of the free stream
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scalar temperature_;
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//- Velocity of the free stream
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vector velocity_;
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//- The indices of patches to introduce molecules across
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labelList patches_;
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//- The molecule types to be introduced
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List<label> moleculeTypeIds_;
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@ -67,10 +63,13 @@ class FreeStream
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//- The number density of the species in the inflow
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Field<scalar> numberDensities_;
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//- A List of Fields, one Field for every species to be introduced, each
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// field entry corresponding to a face on the patch to be injected
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// across.
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List<Field<scalar> > particleFluxAccumulators_;
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//- A List of Lists of Fields specifying carry-over of mass flux from
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// one timestep to the next
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// + Outer List - one inner List for each patch
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// + Inner List - one Field for every species to be introduced
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// + Each field entry corresponding to a face to be injected across
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// with a particular species
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List<List<Field<scalar> > > particleFluxAccumulators_;
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public:
|
||||
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Reference in New Issue
Block a user