Access cell volume from boundry condition

JimKnopf · March 7, 2011, 09:48

Hej there!

I'm struggling with a probably little problem. I want to access the volume of the first cell normal to a boundry from within the boundry condition.

For example like rho*CellVolume for mass of the first cell normal to a boundary.

Probably it's just one line of code, but I don't get, since I'm quite new to OpenFoam programming.

Thanks and greetings
Jim

cliffoi · March 7, 2011, 11:33

The functionality isn't directly available (at least not in the older versions of OF). Maybe theres a better way in OF-1.6 or newer, but this should do the trick.
From with xxxFvPatchField<type>::someFunc()

const fvPatchScalarField& rhop = patch().lookupPatchField<volScalarField, scalar>("rho");
const scalarField& V = patch().boundaryMesh().mesh().V();
const unallocLabelList& faceCells = this->patch().faceCells();

scalarField rhoVp(this->size());

forAll(faceCells, faceI)
{
rhoVp[faceI] = rhop[faceI]*V[faceCells[faceI]];
}

JimKnopf · March 10, 2011, 04:29

Thanks! It did the job.

March 7, 2011, 09:48	Access cell volume from boundry condition	#1
JimKnopf Member Jim Knopf Join Date: Dec 2010 Posts: 60 Rep Power: 15	Hej there! I'm struggling with a probably little problem. I want to access the volume of the first cell normal to a boundry from within the boundry condition. For example like rho*CellVolume for mass of the first cell normal to a boundary. Probably it's just one line of code, but I don't get, since I'm quite new to OpenFoam programming. Thanks and greetings Jim

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March 7, 2011, 11:33		#2
cliffoi Member Ivor Clifford Join Date: Mar 2009 Location: Switzerland Posts: 94 Rep Power: 17	The functionality isn't directly available (at least not in the older versions of OF). Maybe theres a better way in OF-1.6 or newer, but this should do the trick. From with xxxFvPatchField<type>::someFunc() const fvPatchScalarField& rhop = patch().lookupPatchField<volScalarField, scalar>("rho"); const scalarField& V = patch().boundaryMesh().mesh().V(); const unallocLabelList& faceCells = this->patch().faceCells(); scalarField rhoVp(this->size()); forAll(faceCells, faceI) { rhoVp[faceI] = rhop[faceI]*V[faceCells[faceI]]; }

March 10, 2011, 04:29		#3
JimKnopf Member Jim Knopf Join Date: Dec 2010 Posts: 60 Rep Power: 15	Thanks! It did the job.