[fu-ki-pa]

Hi Everybody !

Greetings

I am doing a natural convection problem in which i want to put second derivative of a scalar =0. How can i implement it in openFoam?

Mathematically

or

Thanks and Regards

Fuki

[eugene]

There might be other ways, but I use a fixed gradient boundary and then set the gradient on the boundary equal to n.grad(f) in the near wall cell. So if the gradient normal to the wall is equal to that in the adjacent cell then the "gradient of the gradient" is zero. Of course this is explicit and therefore lags the solution by an iteration.

Eugene

[fu-ki-pa]

Thank a lot Eugene !

[mrshb4]

Dear Eugene

You're right, and that's smart!!
But would you tell me please how would you implement that fixedGradient boundary condition?! I think you would write a new boundary condition and edit the codes in fxedGradient, or do you have any other way?

Thank you
Mohammadreza

[eugene]

No you don't edit fixedGradient. You find another boundary that is derived from fixedGradient, copy it to another name and then edit it.

[jawed]

Dear Eugene,
can you shed more light on its implementation

jawed

[eugene]

Well, you calculate the gradient of the field in question and then for each face in your boundary find the the cell adjacent to it. You then set the gradient on the boundary equal to the surface normal component of the gradient in the near-wall cell. To make things more cost-effective, you probably want to calculate the gradient once per iteration and then store it in the database.

Attached should be an old version of such a boundary I made for use with boundaryFoam. Note it does not have any cost-reduction measures in place - you will have to figure these out yourself.

[jawed]

Dear Eugene,
it seems to work thanks for the patch

jawed

[mrshb4]

Dear Eugene,

Would you please tell me how to compile your bc. I have both openFOAMs 1.5-dev & 1.7.1. In 1.5-dev it has an error finding "uniformDimensionedFields.H". It seems that there is no such file in OF-1.5-dev. But in 1.7.1 it would give another error that is:

/usr/lib/gcc/i486-linux-gnu/4.4.3/../../../../lib/crt1.o: In function `_start':
(.text+0x18): undefined reference to `main'
Make/linuxGccSPOpt/nearWallDist.o: In function `Foam::nearWallDist::doAll()':
nearWallDist.C.text+0x19b): undefined reference to `Foam::cellDistFuncs::cellDistFuncs(FoamlyMesh const&)'
nearWallDist.C.text+0x1c9): undefined reference to `Foam::cellDistFuncs::maxPatchSize(Foam::HashSet<i nt, Foam::Hash<int> > const&) const'
nearWallDist.C.text+0x2f9): undefined reference to `Foam::cellDistFuncs::getPointNeighbours(Foam::Pri mitivePatch<Foam::face, Foam::SubList, Foam::Field<Foam::Vector<float> > const&, Foam::Vector<float> > const&, int, Foam::List<int>&) const'
nearWallDist.C.text+0x34a): undefined reference to `Foam::cellDistFuncs::smallestDist(Foam::Vector<fl oat> const&, FoamlyPatch const&, int, Foam::List<int> const&, int&) const'
Make/linuxGccSPOpt/wallDist.o: In function `Foam::wallDist::correct()':
wallDist..text+0x2ad): undefined reference to `Foam:atchWave:atchWave(FoamlyMesh const&, Foam::HashSet<int, Foam::Hash<int> > const&, bool)'
wallDist.C.text+0x58b): undefined reference to `Foam:atchWave::~patchWave()'
wallDist.C.text+0x640): undefined reference to `Foam:atchWave::~patchWave()'
Make/linuxGccSPOpt/wallDist.o: In function `Foam::wallDist::wallDist(Foam::fvMesh const&, bool)':
wallDist.C.text+0xeba): undefined reference to `Foam::cellDistFuncs::cellDistFuncs(FoamlyMesh const&)'
Make/linuxGccSPOpt/wallDist.o: In function `Foam::wallDist::wallDist(Foam::fvMesh const&, bool)':
wallDist.C.text+0x124a): undefined reference to `Foam::cellDistFuncs::cellDistFuncs(FoamlyMesh const&)'
Make/linuxGccSPOpt/wallDistReflection.o: In function `Foam::FaceCellWave<Foam::wallPointData<Foam::Vect or<float> > >::readFaces(int&, Foam::List<int>&, Foam::List<Foam::wallPointData<Foam::Vector<float> > >&, Foam::Istream&)':
wallDistReflection.C.text._ZN4Foam12FaceCellWaveIN S_13wallPointDataINS_6VectorIfEEEEE9readFacesERiRN S_4ListIiEERNS7_IS4_EERNS_7IstreamE[Foam::FaceCellWave<Foam::wallPointData<Foam::Vecto r<float> > >::readFaces(int&, Foam::List<int>&, Foam::List<Foam::wallPointData<Foam::Vector<float> > >&, Foam::Istream&)]+0x9e): undefined reference to `Foamerator>>(Foam::Istream&, Foam::wallPoint&)'
Make/linuxGccSPOpt/wallDistReflection.o: In function `Foam::FaceCellWave<Foam::wallPointData<Foam::Vect or<float> > >::writeFaces(int, Foam::List<int> const&,
.
.
.
.
.
`Foam::directMappedVelocityFluxFixedValueFvPatchFi eld::directMappedVelocityFluxFixedValueFvPatchFiel d(Foam::fvPatch const&, Foam:imensionedField<Foam::Vector<float>, Foam::volMesh> const&, Foam::dictionary const&)':
directMappedVelocityFluxFixedValueFvPatchField.C.t ext+0x2bea): undefined reference to `typeinfo for Foam::directMappedPatchBase'
directMappedVelocityFluxFixedValueFvPatchField.C.t ext+0x2c15): undefined reference to `typeinfo for Foam::directMappedPolyPatch'
directMappedVelocityFluxFixedValueFvPatchField.C.t ext+0x2d40): undefined reference to `Foam::directMappedPatchBase::typeName'
directMappedVelocityFluxFixedValueFvPatchField.C.t ext+0x2e27): undefined reference to `Foam::directMappedPatchBase::calcMapping() const'
directMappedVelocityFluxFixedValueFvPatchField.C.t ext+0x3043): undefined reference to `Foam::directMappedPolyPatch::typeName'
directMappedVelocityFluxFixedValueFvPatchField.Cte xt+0x306b): undefined reference to `typeinfo for Foam::directMappedPolyPatch'
Make/linuxGccSPOpt/directMappedVelocityFluxFixedValueFvPatchField.o: In function `Foam::directMappedVelocityFluxFixedValueFvPatchFi eld::directMappedVelocityFluxFixedValueFvPatchFiel d(Foam::fvPatch const&, Foam:imensionedField<Foam::Vector<float>, Foam::volMesh> const&, Foam::dictionary const&)':
directMappedVelocityFluxFixedValueFvPatchField.C.t ext+0x319a): undefined reference to `typeinfo for Foam::directMappedPatchBase'
directMappedVelocityFluxFixedValueFvPatchField.C.t ext+0x31c5): undefined reference to `typeinfo for Foam::directMappedPolyPatch'
directMappedVelocityFluxFixedValueFvPatchField.C.t ext+0x32f0): undefined reference to `Foam::directMappedPatchBase::typeName'
directMappedVelocityFluxFixedValueFvPatchField.C.t ext+0x33d7): undefined reference to `Foam::directMappedPatchBase::calcMapping() const'
directMappedVelocityFluxFixedValueFvPatchField.C.t ext+0x35f3): undefined reference to `Foam::directMappedPolyPatch::typeName'
directMappedVelocityFluxFixedValueFvPatchField.C.t ext+0x361b): undefined
timeVaryingMappedPressureDirectedInletVelocityFvPa tchVectorField.C.text._ZN4Foam39timeVaryingMappedF ixedValueFvPatchFieldINS_6VectorIfEEE16readSampleP ointsEv[Foam::timeVaryingMappedFixedValueFvPatchField<Foam ::Vector<float> >::readSamplePoints()]+0x75d): undefined reference to `Foam::triSurface::write(Foam::fileName const&, bool) const'
timeVaryingMappedPressureDirectedInletVelocityFvPa tchVectorField.C.text._ZN4Foam39timeVaryingMappedF ixedValueFvPatchFieldINS_6VectorIfEEE16readSampleP ointsEv[Foam::timeVaryingMappedFixedValueFvPatchField<Foam ::Vector<float> >::readSamplePoints()]+0xa1d): undefined reference to `Foam::triSurfaceTools::calcInterpolationWeights(F oam::triSurface const&, Foam::Field<Foam::Vector<float> > const&, Foam::List<Foam::FixedList<int, 3u> >&, Foam::List<Foam::FixedList<float, 3u> >&)'
timeVaryingMappedPressureDirectedInletVelocityFvPa tchVectorField.C.text._ZN4Foam39timeVaryingMappedF ixedValueFvPatchFieldINS_6VectorIfEEE16readSampleP ointsEv[Foam::timeVaryingMappedFixedValueFvPatchField<Foam ::Vector<float> >::readSamplePoints()]+0xc12): undefined reference to `Foam::triSurface::~triSurface()'
timeVaryingMappedPressureDirectedInletVelocityFvPa tchVectorField.C.text._ZN4Foam39timeVaryingMappedF ixedValueFvPatchFieldINS_6VectorIfEEE16readSampleP ointsEv[Foam::timeVaryingMappedFixedValueFvPatchField<Foam ::Vector<float> >::readSamplePoints()]+0x15a9): undefined reference to `Foam::triSurface::~triSurface()'
Make/linuxGccSPOpt/timeVaryingMappedFixedValueFvPatchFields.o: In function `Foam::timeVaryingMappedFixedValueFvPatchField<flo at>::readSamplePoints()':
timeVaryingMappedFixedValueFvPatchFields.C.text._Z N4Foam39timeVaryingMappedFixedValueFvPatchFieldIfE 16readSamplePointsEv[Foam::timeVaryingMappedFixedValueFvPatchField<floa t>::readSamplePoints()]+0x4e9): undefined reference to `Foam::coordinateSystem::coordinateSystem(Foam::wo rd const&, Foam::Vector<float> const&, Foam::Vector<float> const&, Foam::Vector<float> const&)'
timeVaryingMappedFixedValueFvPatchFields.C.text._Z N4Foam39timeVaryingMappedFixedValueFvPatchFieldIfE 16readSamplePointsEv[Foam::timeVaryingMappedFixedValueFvPatchField<floa t>::readSamplePoints()]+0x5f9): undefined reference to `Foam::triSurfaceTools::delaunay2D(Foam::List<Foam ::Vector2D<float> > const&)'
timeVaryingMappedFixedValueFvPatchFields.C.text._Z N4Foam39timeVaryingMappedFixedValueFvPatchFieldIfE 16readSamplePointsEv[Foam::timeVaryingMappedFixedValueFvPatchField<floa t>::readSamplePoints()]+0x725): undefined reference to `Foam::triSurface::write(Foam::fileName const&, bool) const'
timeVaryingMappedFixedValueFvPatchFields.C.text._Z N4Foam39timeVaryingMappedFixedValueFvPatchFieldIfE 16readSamplePointsEv[Foam::timeVaryingMappedFixedValueFvPatchField<floa t>::readSamplePoints()]+0x9e5): undefined reference to `Foam::triSurfaceTools::calcInterpolationWeights(F oam::triSurface const&, Foam::Field<Foam::Vector<float> > const&, Foam::List<Foam::FixedList<int, 3u> >&, Foam::List<Foam::FixedList<float, 3u> >&)'
timeVaryingMappedFixedValueFvPatchFields.C.text._Z N4Foam39timeVaryingMappedFixedValueFvPatchFieldIfE 16readSamplePointsEv[Foam::timeVaryingMappedFixedValueFvPatchField<floa t>::readSamplePoints()]+0xbcb): undefined reference to `Foam::triSurface::~triSurface()'
timeVaryingMappedFixedValueFvPatchFields.C.text._Z N4Foam39timeVaryingMappedFixedValueFvPatchFieldIfE 16readSamplePointsEv[Foam::timeVaryingMappedFixedValueFvPatchField<floa t>::readSamplePoints()]+0x156c): undefined reference to `Foam::triSurface::~triSurface()'
Make/linuxGccSPOpt/timeVaryingMappedFixedValueFvPatchFields.o: In function `Foam::timeVaryingMappedFixedValueFvPatchField<Foa m::Tensor<float> >::readSamplePoints()':
timeVaryingMappedFixedValueFvPatchFields.C.text._Z N4Foam39timeVaryingMappedFixedValueFvPatchFieldINS _6TensorIfEEE16readSamplePointsEv[Foam::timeVaryingMappedFixedValueFvPatchField<Foam ::Tensor<float> >::readSamplePoints()]+0x4e9): undefined reference to `Foam::coordinateSystem::coordinateSystem(Foam::wo rd const&, Foam::Vector<float> const&, Foam::Vector<float> const&, Foam::Vector<float> const&)'
timeVaryingMappedFixedValueFvPatchFields.C.text._Z N4Foam39timeVaryingMappedFixedValueFvPatchFieldINS _6TensorIfEEE16readSamplePointsEv[Foam::timeVaryingMappedFixedValueFvPatchField<Foam ::Tensor<float> >::readSamplePoints()]+0x5f9): undefined reference to `Foam::triSurfaceTools::delaunay2D(Foam::List<Foam ::Vector2D<float> > const&)'
timeVaryingMappedFixedValueFvPatchFields.C.text._Z N4Foam39timeVaryingMappedFixedValueFvPatchFieldINS _6TensorIfEEE16readSamplePointsEv[Foam::timeVaryingMappedFixedValueFvPatchField<Foam ::Tensor<float> >::readSamplePoints()]+0x725): undefined reference to `Foam::triSurface::write(Foam::fileName const&, bool) const'
timeVaryingMappedFixedValueFvPatchFields.C.text._Z N4Foam39timeVaryingMappedFixedValueFvPatchFieldINS _6TensorIfEEE16readSamplePointsEv[Foam::timeVaryingMappedFixedValueFvPatchField<Foam ::Tensor<float> >::readSamplePoints()]+0x9e5): undefined reference to `Foam::triSurfaceTools::calcInterpolationWeights(F oam::triSurface const&, Foam::Field<Foam::Vector<float> > const&, Foam::List<Foam::FixedList<int, 3u> >&, Foam::List<Foam::FixedList<float, 3u> >&)'
timeVaryingMappedFixedValueFvPatchFields.C.text._Z N4Foam39timeVaryingMappedFixedValueFvPatchFieldINS _6TensorIfEEE16readSamplePointsEv[Foam::timeVaryingMappedFixedValueFvPatchField<Foam ::Tensor<float> >::readSamplePoints()]+0xbcb): undefined reference to `Foam::triSurface::~triSurface()'
timeVaryingMappedFixedValueFvPatchFields.C.text._Z N4Foam39timeVaryingMappedFixedValueFvPatchFieldINS _6TensorIfEEE16readSamplePointsEv[Foam::timeVaryingMappedFixedValueFvPatchField<Foam ::Tensor<float> >::readSamplePoints()]+0x156c): undefined reference to `Foam::triSurface::~triSurface()'
Make/linuxGccSPOpt/timeVaryingMappedFixedValueFvPatchFields.o: In function `Foam::timeVaryingMappedFixedValueFvPatchField<Foa m::SphericalTensor<float> >::readSamplePoints()':
timeVaryingMappedFixedValueFvPatchFields.C.text._Z N4Foam39timeVaryingMappedFixedValueFvPatchFieldINS _15SphericalTensorIfEEE16readSamplePointsEv[Foam::timeVaryingMappedFixedValueFvPatchField<Foam ::SphericalTensor<float> >::readSamplePoints()]+0x4e9): undefined reference to `Foam::coordinateSystem::coordinateSystem(Foam::wo rd const&, Foam::Vector<float> const&, Foam::Vector<float> const&, Foam::Vector<float> const&)'
timeVaryingMappedFixedValueFvPatchFields.C.text._Z N4Foam39timeVaryingMappedFixedValueFvPatchFieldINS _15SphericalTensorIfEEE16readSamplePointsEv[Foam::timeVaryingMappedFixedValueFvPatchField<Foam ::SphericalTensor<float> >::readSamplePoints()]+0x5f9): undefined reference to `Foam::triSurfaceTools::delaunay2D(Foam::List<Foam ::Vector2D<float> > const&)'
timeVaryingMappedFixedValueFvPatchFields.C.text._Z N4Foam39timeVaryingMappedFixedValueFvPatchFieldINS _15SphericalTensorIfEEE16readSamplePointsEv[Foam::timeVaryingMappedFixedValueFvPatchField<Foam ::SphericalTensor<float> >::readSamplePoints()]+0x725): undefined reference to `Foam::triSurface::write(Foam::fileName const&, bool) const'
timeVaryingMappedFixedValueFvPatchFields.C.text._Z N4Foam39timeVaryingMappedFixedValueFvPatchFieldINS _15SphericalTensorIfEEE16readSamplePointsEv[Foam::timeVaryingMappedFixedValueFvPatchField<Foam ::SphericalTensor<float> >::readSamplePoints()]+0x9e5): undefined reference to `Foam::triSurfaceTools::calcInterpolationWeights(F oam::triSurface const&, Foam::Field<Foam::Vector<float> > const&, Foam::List<Foam::FixedList<int, 3u> >&, Foam::List<Foam::FixedList<float, 3u> >&)'
timeVaryingMappedFixedValueFvPatchFields.C.text._Z N4Foam39timeVaryingMappedFixedValueFvPatchFieldINS _15SphericalTensorIfEEE16readSamplePointsEv[Foam::timeVaryingMappedFixedValueFvPatchField<Foam ::SphericalTensor<float> >::readSamplePoints()]+0xbcb): undefined reference to `Foam::triSurface::~triSurface()'
timeVaryingMappedFixedValueFvPatchFields.C.text._Z N4Foam39timeVaryingMappedFixedValueFvPatchFieldINS _15SphericalTensorIfEEE16readSamplePointsEv[Foam::timeVaryingMappedFixedValueFvPatchField<Foam ::SphericalTensor<float> >::readSamplePoints()]+0x156c): undefined reference to `Foam::triSurface::~triSurface()'
Make/linuxGccSPOpt/timeVaryingMappedFixedValueFvPatchFields.o: In function `Foam::timeVaryingMappedFixedValueFvPatchField<Foa m::SymmTensor<float> >::readSamplePoints()':
timeVaryingMappedFixedValueFvPatchFields.C.text._Z N4Foam39timeVaryingMappedFixedValueFvPatchFieldINS _10SymmTensorIfEEE16readSamplePointsEv[Foam::timeVaryingMappedFixedValueFvPatchField<Foam ::SymmTensor<float> >::readSamplePoints()]+0x4e9): undefined reference to `Foam::coordinateSystem::coordinateSystem(Foam::wo rd const&, Foam::Vector<float> const&, Foam::Vector<float> const&, Foam::Vector<float> const&)'
timeVaryingMappedFixedValueFvPatchFields.C.text._Z N4Foam39timeVaryingMappedFixedValueFvPatchFieldINS _10SymmTensorIfEEE16readSamplePointsEv[Foam::timeVaryingMappedFixedValueFvPatchField<Foam ::SymmTensor<float> >::readSamplePoints()]+0x5f9): undefined reference to `Foam::triSurfaceTools::delaunay2D(Foam::List<Foam ::Vector2D<float> > const&)'
timeVaryingMappedFixedValueFvPatchFields.C.text._Z N4Foam39timeVaryingMappedFixedValueFvPatchFieldINS _10SymmTensorIfEEE16readSamplePointsEv[Foam::timeVaryingMappedFixedValueFvPatchField<Foam ::SymmTensor<float> >::readSamplePoints()]+0x725): undefined reference to `Foam::triSurface::write(Foam::fileName const&, bool) const'
timeVaryingMappedFixedValueFvPatchFields.C.text._Z N4Foam39timeVaryingMappedFixedValueFvPatchFieldINS _10SymmTensorIfEEE16readSamplePointsEv[Foam::timeVaryingMappedFixedValueFvPatchField<Foam ::SymmTensor<float> >::readSamplePoints()]+0x9e5): undefined reference to `Foam::triSurfaceTools::calcInterpolationWeights(F oam::triSurface const&, Foam::Field<Foam::Vector<float> > const&, Foam::List<Foam::FixedList<int, 3u> >&, Foam::List<Foam::FixedList<float, 3u> >&)'
timeVaryingMappedFixedValueFvPatchFields.C.text._Z N4Foam39timeVaryingMappedFixedValueFvPatchFieldINS _10SymmTensorIfEEE16readSamplePointsEv[Foam::timeVaryingMappedFixedValueFvPatchField<Foam ::SymmTensor<float> >::readSamplePoints()]+0xbcb): undefined reference to `Foam::triSurface::~triSurface()'
timeVaryingMappedFixedValueFvPatchFields.C.text._Z N4Foam39timeVaryingMappedFixedValueFvPatchFieldINS _10SymmTensorIfEEE16readSamplePointsEv[Foam::timeVaryingMappedFixedValueFvPatchField<Foam ::SymmTensor<float> >::readSamplePoints()]+0x156c): undefined reference to `Foam::triSurface::~triSurface()'
Make/linuxGccSPOpt/porousZone.o: In function `FoamrousZone::writeDict(Foam::Ostream&, bool) const':
porousZone.C.text+0x1224): undefined reference to `Foam::coordinateSystem::writeDict(Foam::Ostream&, bool) const'
Make/linuxGccSPOpt/porousZone.o: In function `FoamrousZonerousZone(Foam::word const&, Foam::fvMesh const&, Foam::dictionary const&)':
porousZone.C.text+0x1813): undefined reference to `Foam::coordinateSystem::coordinateSystem(Foam::di ctionary const&, Foam:bjectRegistry const&)'
porousZone.C.text+0x2b84): undefined reference to `Foam::coordinateSystem::~coordinateSystem()'
Make/linuxGccSPOpt/porousZone.o: In function `FoamrousZonerousZone(Foam::word const&, Foam::fvMesh const&, Foam::dictionary const&)':
porousZone.C.text+0x2df3): undefined reference to `Foam::coordinateSystem::coordinateSystem(Foam::di ctionary const&, Foam:bjectRegistry const&)'
porousZone.C.text+0x4103): undefined reference to `Foam::coordinateSystem::~coordinateSystem()'
Make/linuxGccSPOpt/porousZone.o: In function `FoamrousZone::~porousZone()':
porousZone.C.text._ZN4Foam10porousZoneD1Ev[FoamousZone::~porousZone()]+0x4f): undefined reference to `Foam::coordinateSystem::~coordinateSystem()'
Make/linuxGccSPOpt/porousZone.o: In function `FoamrousZone::~porousZone()':
porousZone.C.text._ZN4Foam10porousZoneD0Ev[FoamrousZone::~porousZone()]+0x53): undefined reference to `Foam::coordinateSystem::~coordinateSystem()'
Make/linuxGccSPOpt/MRFZone.o: In function `Foam::MRFZone::setMRFFaces()':
MRFZone.C.text+0x194a): undefined reference to `Foam::faceSet::faceSet(FoamlyMesh const&, Foam::word const&, Foam::HashSet<int, Foam::Hash<int> > const&, Foam::IOobject::writeOption)'
MRFZone.C.text+0x1a98): undefined reference to `Foam::faceSet::faceSet(FoamlyMesh const&, Foam::word const&, int, Foam::IOobject::writeOption)'
MRFZone.C.text+0x1f67): undefined reference to `Foam::faceSet::~faceSet()'
MRFZone.C.text+0x1f75): undefined reference to `Foam::faceSet::~faceSet()'
MRFZone.C.text+0x1f83): undefined reference to `Foam::faceSet::~faceSet()'
MRFZone.C.text+0x21d4): undefined reference to `Foam::faceSet::faceSet(FoamlyMesh const&, Foam::word const&, int, Foam::IOobject::writeOption)'
MRFZone.C.text+0x26b9): undefined reference to `Foam::faceSet::~faceSet()'
MRFZone.C.text+0x2720): undefined reference to `Foam::faceSet::~faceSet()'
MRFZone.C.text+0x2766): undefined reference to `Foam::faceSet::~faceSet()'
MRFZone.C.text+0x27aa): undefined reference to `Foam::faceSet::~faceSet()'
Make/linuxGccSPOpt/pressureGradientExplicitSource.o: In function `Foam:ressureGradientExplicitSource:ressureGradien tExplicitSource(Foam::word const&, Foam::GeometricField<Foam::Vector<float>, Foam::fvPatchField, Foam::volMesh>&)':
pressureGradientExplicitSource.C.text+0x559): undefined reference to `Foam::topoSetSource::New(Foam::word const&, Foam:olyMesh const&, Foam::dictionary const&)'
pressureGradientExplicitSource.C.text+0x61c): undefined reference to `Foam::cellSet::cellSet(FoamlyMesh const&, Foam::word const&, int, Foam::IOobject::writeOption)'
pressureGradientExplicitSource.C.text+0xe87): undefined reference to `Foam::cellSet::~cellSet()'
Make/linuxGccSPOpt/pressureGradientExplicitSource.o: In function `Foam:ressureGradientExplicitSource:ressureGradien tExplicitSource(Foam::word const&, Foam::GeometricField<Foam::Vector<float>, Foam::fvPatchField, Foam::volMesh>&)':
pressureGradientExplicitSource.C.text+0x1759): undefined reference to `Foam::topoSetSource::New(Foam::word const&, FoamlyMesh const&, Foam::dictionary const&)'
pressureGradientExplicitSource.C.text+0x181c): undefined reference to `Foam::cellSet::cellSet(FoamlyMesh const&, Foam::word const&, int, Foam::IOobject::writeOption)'
pressureGradientExplicitSource.C.text+0x2087): undefined reference to `Foam::cellSet::~cellSet()'
Make/linuxGccSPOpt/basicSource.o: In function `Foam::basicSource::setCellSet()':
basicSource.C.text+0x1430): undefined reference to `Foam::cellSet::cellSet(FoamlyMesh const&, Foam::word const&, Foam::IOobject::readOption, Foam::IOobject::writeOption)'
basicSource.C.text+0x147d): undefined reference to `Foam::cellSet::~cellSet()'
basicSource.C.text+0x164c): undefined reference to `Foam::cellSet::~cellSet()'
collect2: ld returned 1 exit status
make: *** [OpenFOAM.out] Error 1

I just copy the extrapolatedGradient folder in the path :

/home/mrshb4/OpenFOAM/OpenFOAM-1.7.1/src/finiteVolume/fields/fvPatchFields/basic/extrapolatedGradient

could you please tell me how can I compile that?!!

Thanks
Mohammadreza

[Thamali]

Did you get through these errors,although it is too late to ask this from you.I got similar type of errors.Il put them below.Please see whether you can help me.Im stucked at this point for some days.

thamali@thamali-VirtualBox:~/OpenFOAM/thamali-2.2.2/applications/solvers/my_fireFoam11$ Make/linuxGccDPOpt/my_fireFoam.o: In function `Foam::fv::laplacianScheme<double, Foam::Vector<double> >::New(Foam::fvMesh const&, Foam::Istream&)':
my_fireFoam.C.text._ZN4Foam2fv15laplacianSchemeI dNS_6VectorIdEEE3NewERKNS_6fvMeshERNS_7IstreamE[Foam::fv::laplacianScheme<double, Foam::Vector<double> >::New(Foam::fvMesh const&, Foam::Istream&)]+0x53): undefined reference to `Foam::fv::laplacianScheme<double, Foam::Vector<double> >::IstreamConstructorTablePtr_'
my_fireFoam.C.text._ZN4Foam2fv15laplacianSchemeI dNS_6VectorIdEEE3NewERKNS_6fvMeshERNS_7IstreamE[Foam::fv::laplacianScheme<double, Foam::Vector<double> >::New(Foam::fvMesh const&, Foam::Istream&)]+0x1a5): undefined reference to `Foam::fv::laplacianScheme<double, Foam::Vector<double> >::IstreamConstructorTablePtr_'
my_fireFoam.C.text._ZN4Foam2fv15laplacianSchemeI dNS_6VectorIdEEE3NewERKNS_6fvMeshERNS_7IstreamE[Foam::fv::laplacianScheme<double, Foam::Vector<double> >::New(Foam::fvMesh const&, Foam::Istream&)]+0x1d5): undefined reference to `Foam::fv::laplacianScheme<double, Foam::Vector<double> >::IstreamConstructorTablePtr_'
collect2: ld returned 1 exit status
make: *** [/home/thamali/OpenFOAM/thamali-2.2.2/platforms/linuxGccDPOpt/bin/my_fireFoam] Error 1

[Dan_Sobien]

Originally Posted by eugene

Attached should be an old version of such a boundary I made for use with boundaryFoam. Note it does not have any cost-reduction measures in place - you will have to figure these out yourself.

Would it be possible to edit this patch type to include vectors as well? Thanks for any advice or info.

[waelitani]

I have modified the extrapolated Gradient boundary condition above to work with OpenFOAM v8.

Enjoy,