Getting the cells next to a patch
I want to get the indexes of the cells right next to a patch. In other words, I want to access the owner index of a face that conforms a patch
something like this
That will give you cell indices for cells next to patch faces.
Thanks a lot Hrv!
Now I want to access the face values of a boundary patch in a specific scalarField/vectorField using these indexes.
I mean, let says that
forAll ( patch.faceCells(),cellI) gives me indexes cellI=1 2 ....
then cell has a face on this patch whose b value is -1.0, where b is an scalar field
I want to recover this -1.0.
I hope I was clear enough
I suggest you read the code in wallViscosity
what different is betweent U.boundaryField( )[patchi].patchInternalField( ) and U[faceCelli]
I try to program the Simpson's rule in order to obtain the pressure force on a patch. To do it I should obtain the value of the pressure in all cells next to the patch. I have programed:
const fvPatch& curPatch = forcePatches[patchi];
label forcePatchID = mesh.boundaryMesh().findPatchID(forcePatches[patchi]);
scalarField& pp = p.boundaryField()[patchi];
label faceCelli = curPatch.faceCells()[facei];
P[faceCelli]=pp[faceCelli]; // I save the values of pressure in vector P
// Now, Simpson's rule:
int i = 1;
for(int i = 1; i <= 374; i++) // I have 750 cells on each patch
A = A + 2 * P[2*i]*0.02*0.02; // where 0.02*0.02 is the area of the face of each cell
int j = 2;
for(int j = 2; j <= 375; j++)
B = B + 4 * P[2*j-1]*0.02*0.02;
a0 = P;
an = P;
scalar PressForce = 0.02/3*(a0 + A + B + an);
vector patchPressForce = PressForce * gSum(mesh.Sf().boundaryField()[forcePatchID])/gSum(mesh.magSf().boundaryField()[forcePatchID]);
// Multiply the resulting force by density to account for normalisation in
// incompressible solvers, and get component in direction of motion
scalar totPatchPressForce = (patchPressForce
) & aVector;
Info << "Area of patch " << forcePatches[patchi] << " [m^2] = "
<< gSum(mesh.magSf().boundaryField()[forcePatchID]) << endl;
Info << "Pressure force on patch " << forcePatches[patchi] << " [N] = " << totPatchPressForce << endl;
totPressureForce += totPatchPressForce;
Info << "Total Pressure Force along motion vector [N] = " << totPressureForce << endl;
But this loop does not work. Any ideas?? Where is the problem??
Thanks a lot.
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