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Forum: OpenFOAM Programming & Development

October 26, 2010, 05:02

Replies: 22

Neumann boundary conditions

Views: 8,423

Posted By Cyp

Hi Herbert! Indeed I want to edit the BC for...

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)

Forum: OpenFOAM Programming & Development

October 25, 2010, 10:28

Replies: 22

Neumann boundary conditions

Views: 8,423

Posted By Cyp

Hi! I succed in the compilation using...

Hi!

I succed in the compilation using this piece of code :

label patchID = mesh.boundaryMesh().findPatchID("inlet");

fixedGradientFvPatchScalarField&...

Forum: OpenFOAM Programming & Development

October 18, 2010, 11:53

Replies: 22

Neumann boundary conditions

Views: 8,423

Posted By Cyp

Hi Martin! Thank you very much for your...

Hi Martin!

Thank you very much for your answer. I am not sure to understand very well...

I tried:

label patchID = mesh.boundaryMesh().findPatchID("inlet");...

Forum: OpenFOAM Programming & Development

October 14, 2010, 13:41

Replies: 22

Neumann boundary conditions

Views: 8,423

Posted By Cyp

I think it could work with : gradUField =...

I think it could work with :

gradUField = linearInterpolate(-(inv(M)&U)+rho*g) & mesh.Sf();

Forum: OpenFOAM Programming & Development

October 14, 2010, 13:14

Replies: 22

Neumann boundary conditions

Views: 8,423

Posted By Cyp

Thank you very much Martin. It helps me much in...

Thank you very much Martin. It helps me much in the understanding !

So I changed the code as :

label patchID = mesh.boundaryMesh().findPatchID("inlet");
fixedGradientFvPatchScalarField&...

Forum: OpenFOAM Programming & Development

October 14, 2010, 12:33

Replies: 22

Neumann boundary conditions

Views: 8,423

Posted By Cyp

I have a problem of understanding: the gradient...

I have a problem of understanding: the gradient of a scalar should be a vector. So the following snippet should work:

label patchID = mesh.boundaryMesh().findPatchID("inlet");
...

Forum: OpenFOAM Programming & Development

October 14, 2010, 10:26

Replies: 22

Neumann boundary conditions

Views: 8,423

Posted By Cyp

Ok. Thank you very much. It compiles now. ...

Ok. Thank you very much. It compiles now.

But in case U is a volScalarField (a pressure field for example)? The code of Hebert should works, shouldn't it ?

Forum: OpenFOAM Programming & Development

October 14, 2010, 09:28

Replies: 22

Neumann boundary conditions

Views: 8,423

Posted By Cyp

Hi Stefan and everybody, I trying to...

Hi Stefan and everybody,

I trying to implement neumann BC with your method but I had a fail during the compilation. I have merely copy your piece of code in my main.C file and I included...

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