Neumann boundary conditions

Cyp · October 26, 2010, 06:02

Hi Herbert!

Indeed I want to edit the BC for p from the BC of U (in the case of a two-phase Darcy law)

herbert · October 26, 2010, 07:47

Okay,

I was just confused because of your nomenclature...

mrshb4 · September 7, 2011, 18:48

Dear Firends!!!

I used refCast for temperture filed like this;

label patchID = mesh.boundaryMesh().findPatchID("right");
-------------------------------------------------------------------------------------------------------------
fixedGradientFvPatchScalarField& gradUPatch=refCast<fixedGradientFvPatchScalarField >(T.boundaryField()[patchID]);
scalarField& gradUField = gradUPatch.gradient();

but during compilation faced this error:
================================================== =========
solveEnergy.H:78: error: ‘fixedGradientFvPatchField’ was not declared in this scope
solveEnergy.H:78: error: ‘gradUPatch’ was not declared in this scope
solveEnergy.H:78: error: ‘fixedGradientFvPatchField’ cannot appear in a constant-expression
solveEnergy.H:78: error: no matching function for call to ‘refCast(Foam::fvPatchField<double>&)’
================================================== =========

I also add this to my header but still have error
# include "fixedGradientFvPatchFields.H"

I use fixedValue in the same way in my code but no error would occur and everything works fine!!!

what's the problem?!

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October 26, 2010, 06:02		#21
Cyp Senior Member Cyprien Join Date: Feb 2010 Location: Stanford University Posts: 299 Rep Power: 18	Hi Herbert! Indeed I want to edit the BC for p from the BC of U (in the case of a two-phase Darcy law)

October 26, 2010, 07:47		#22
herbert Senior Member Stefan Herbert Join Date: Dec 2009 Location: Darmstadt, Germany Posts: 129 Rep Power: 17	Okay, I was just confused because of your nomenclature...

September 7, 2011, 18:48		#23
mrshb4 Member Mohammad.R.Shetab Join Date: Jul 2010 Posts: 49 Rep Power: 16	Dear Firends!!! I used refCast for temperture filed like this; label patchID = mesh.boundaryMesh().findPatchID("right"); ------------------------------------------------------------------------------------------------------------- fixedGradientFvPatchScalarField& gradUPatch=refCast<fixedGradientFvPatchScalarField >(T.boundaryField()[patchID]); scalarField& gradUField = gradUPatch.gradient(); but during compilation faced this error: ================================================== ========= solveEnergy.H:78: error: ‘fixedGradientFvPatchField’ was not declared in this scope solveEnergy.H:78: error: ‘gradUPatch’ was not declared in this scope solveEnergy.H:78: error: ‘fixedGradientFvPatchField’ cannot appear in a constant-expression solveEnergy.H:78: error: no matching function for call to ‘refCast(Foam::fvPatchField<double>&)’ ================================================== ========= I also add this to my header but still have error # include "fixedGradientFvPatchFields.H" I use fixedValue in the same way in my code but no error would occur and everything works fine!!! what's the problem?!