| aerosjc |
April 17, 2018 17:38 |
How to output the drag force on particle in LPT OpenFoam
I use OpenFoam to simulate one particle in fluid. I used the “Spheredrag” and I would like to output the drag force on the particle. First I added some codes in the SphereDragForce.C, which is in /lagrangian/intermediate/submodels/Kinematic/ParticleForces/Drag/SphereDrag
The following is the code and the red lines are that I added by myself.
Code:
#include "SphereDragForce.H"
#include <iostream>
#include <fstream>
// * * * * * * * * * * * * * Private Member Functions * * * * * * * * * * * //
template<class CloudType>
Foam::scalar Foam::SphereDragForce<CloudType>::CdRe(const scalar Re) const
{
if (Re > 1000.0)
{
return 0.424*Re;
}
else
{
return 24.0*(1.0 + 1.0/6.0*pow(Re, 2.0/3.0));
}
}
// * * * * * * * * * * * * * * * * Constructors * * * * * * * * * * * * * * //
template<class CloudType>
Foam::SphereDragForce<CloudType>::SphereDragForce
(
CloudType& owner,
const fvMesh& mesh,
const dictionary& dict
)
:
ParticleForce<CloudType>(owner, mesh, dict, typeName, false)
{}
template<class CloudType>
Foam::SphereDragForce<CloudType>::SphereDragForce
(
const SphereDragForce<CloudType>& df
)
:
ParticleForce<CloudType>(df)
{}
// * * * * * * * * * * * * * * * * Destructor * * * * * * * * * * * * * * * //
template<class CloudType>
Foam::SphereDragForce<CloudType>::~SphereDragForce()
{}
// * * * * * * * * * * * * * * * Member Functions * * * * * * * * * * * * * //
ofstream outputfile1("dragforce.dat", std::ios::out );
template<class CloudType>
Foam::forceSuSp Foam::SphereDragForce<CloudType>::calcCoupled
(
const typename CloudType::parcelType& p,
const scalar dt,
const scalar mass,
const scalar Re,
const scalar muc
) const
{
forceSuSp value(Zero, 0.0);
value.Sp() = mass*0.75*muc*CdRe(Re)/(p.rho()*sqr(p.d()));
outputfile1 << "drag " << value.Sp() << endl;
return value;
}
When I do wmake libso, the following errors appear:
Code:
Make/linux64GccDPInt32Opt/parcels/derived/basicThermoParcel/makeBasicThermoParcelSubmodels.o:(.bss+0xb80): multiple definition of `outputfile1'
Make/linux64GccDPInt32Opt/parcels/derived/basicKinematicParcel/makeBasicKinematicParcelSubmodels.o:(.bss+0xb40): first defined here
Make/linux64GccDPInt32Opt/parcels/derived/basicReactingParcel/makeBasicReactingParcelSubmodels.o:(.bss+0xd00): multiple definition of `outputfile1'
Make/linux64GccDPInt32Opt/parcels/derived/basicKinematicParcel/makeBasicKinematicParcelSubmodels.o:(.bss+0xb40): first defined here
Make/linux64GccDPInt32Opt/parcels/derived/basicReactingMultiphaseParcel/makeBasicReactingMultiphaseParcelSubmodels.o:(.bss+0xec0): multiple definition of `outputfile1'
Make/linux64GccDPInt32Opt/parcels/derived/basicKinematicParcel/makeBasicKinematicParcelSubmodels.o:(.bss+0xb40): first defined here
Make/linux64GccDPInt32Opt/parcels/derived/basicKinematicMPPICParcel/makeBasicKinematicMPPICParcelSubmodels.o:(.bss+0xdc0): multiple definition of `outputfile1'
Make/linux64GccDPInt32Opt/parcels/derived/basicKinematicParcel/makeBasicKinematicParcelSubmodels.o:(.bss+0xb40): first defined here
collect2: error: ld returned 1 exit status
make: *** […/platforms/linux64GccDPInt32Opt/lib/libZHOnelagrangianIntermediate.so] Error 1
So I think maybe we cannot add the codes in SphereDragForce.C to output the drag force on particle. Then I added some codes (red color) in the creatFields.H and here are the codes:
Code:
#include "readGravitationalAcceleration.H"
word continuousPhaseName
(
IOdictionary
(
IOobject
(
"transportProperties",
runTime.constant(),
mesh,
IOobject::MUST_READ
)
).lookup("continuousPhaseName")
);
Info<< "Reading field U\n" << endl;
volVectorField Uc
(
IOobject
(
IOobject::groupName("U", continuousPhaseName),
runTime.timeName(),
mesh,
IOobject::MUST_READ,
IOobject::AUTO_WRITE
),
mesh
);
Info<< "Reading field p\n" << endl;
volScalarField p
(
IOobject
(
"p",
runTime.timeName(),
mesh,
IOobject::MUST_READ,
IOobject::AUTO_WRITE
),
mesh
);
Info<< "Reading/calculating continuous-phase face flux field phic\n"
<< endl;
surfaceScalarField phic
(
IOobject
(
IOobject::groupName("phi", continuousPhaseName),
runTime.timeName(),
mesh,
IOobject::READ_IF_PRESENT,
IOobject::AUTO_WRITE
),
linearInterpolate(Uc) & mesh.Sf()
);
label pRefCell = 0;
scalar pRefValue = 0.0;
setRefCell(p, pimple.dict(), pRefCell, pRefValue);
mesh.setFluxRequired(p.name());
Info<< "Creating turbulence model\n" << endl;
singlePhaseTransportModel continuousPhaseTransport(Uc, phic);
dimensionedScalar rhocValue
(
IOobject::groupName("rho", continuousPhaseName),
dimDensity,
continuousPhaseTransport.lookup
(
IOobject::groupName("rho", continuousPhaseName)
)
);
volScalarField rhoc
(
IOobject
(
rhocValue.name(),
runTime.timeName(),
mesh,
IOobject::NO_READ,
IOobject::AUTO_WRITE
),
mesh,
rhocValue
);
volScalarField muc
(
IOobject
(
IOobject::groupName("mu", continuousPhaseName),
runTime.timeName(),
mesh,
IOobject::NO_READ,
IOobject::AUTO_WRITE
),
rhoc*continuousPhaseTransport.nu()
);
Info << "Creating field alphac\n" << endl;
// alphac must be constructed before the cloud
// so that the drag-models can find it
volScalarField alphac
(
IOobject
(
IOobject::groupName("alpha", continuousPhaseName),
runTime.timeName(),
mesh,
IOobject::READ_IF_PRESENT,
IOobject::AUTO_WRITE
),
mesh,
dimensionedScalar("0", dimless, 0)
);
word kinematicCloudName("kinematicCloud");
args.optionReadIfPresent("cloudName", kinematicCloudName);
volScalarField spheredrag
(
IOobject
(
"SphereDragForce",
runTime.timeName(),
mesh,
IOobject::NO_READ,
IOobject::AUTO_WRITE
),
mesh,
);
Info<< "Constructing kinematicCloud " << kinematicCloudName << endl;
basicKinematicTypeCloud kinematicCloud
(
kinematicCloudName,
rhoc,
Uc,
muc,
g
);
// Particle fraction upper limit
scalar alphacMin
(
1.0
- readScalar
(
kinematicCloud.particleProperties().subDict("constantProperties")
.lookup("alphaMax")
)
);
// Update alphac from the particle locations
alphac = max(1.0 - kinematicCloud.theta(), alphacMin);
alphac.correctBoundaryConditions();
surfaceScalarField alphacf("alphacf", fvc::interpolate(alphac));
surfaceScalarField alphaPhic("alphaPhic", alphacf*phic);
autoPtr<PhaseIncompressibleTurbulenceModel<singlePhaseTransportModel>>
continuousPhaseTurbulence
(
PhaseIncompressibleTurbulenceModel<singlePhaseTransportModel>::New
(
alphac,
Uc,
alphaPhic,
phic,
continuousPhaseTransport
)
);
When I run wmake, it compile successfully.
But when simulate a case, it shows the error
cannot find file "…/0/SphereDragForce"
From function virtual Foam::autoPtr<Foam::ISstream> Foam::fileOperations::uncollatedFileOperation::rea dStream(Foam::regIOobject&, const Foam::fileName&, const Foam::word&, bool) const in file
global/fileOperations/uncollatedFileOperation/uncollatedFileOperation.C at line 505.
FOAM exiting
Thanks |
