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Face IDs for cells at boundary patch

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Old   June 17, 2016, 17:56
Default Face IDs for cells at boundary patch
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Praveen Srikanth
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Hello Forum users,

I am working with the conjugate heat transfer solver where I am trying to find the temperature at a liquid vapor interface by interpolating the temperatures from the liquid and the gas regions and taking an average. I interpolate the temperatures with

Code:
surfaceScalarField TI_liquid = fvc::interpolate(liquidT); 
surfaceScalarField TI_gas = fvc::interpolate(gasT);
but this does it for the entire region. I also know the cells next to the boundary which I get using the respective patchIDs

Code:
const labelList& gasPFaceCells = gasMesh_.boundary()[gasPatchID_].faceCells();
But I am not sure how to find the face IDs for the boundary faces for these cells which I can then use to get the interpolated temperature at the boundary. I have been going through this forum without much luck so any help is most appreciated
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Old   June 23, 2016, 07:13
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Vignesh
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Hi,
If you have not figured it out,


Code:
//To access the mesh information for the boundary
const polyPatch& cPatch = mesh.boundaryMesh()[patchI];

//Starting index of the face in a patch
label faceId_start = cPatch.start() ;

List of cells close to a boundary
const labelUList& faceCells = cPatch.faceCells();

forAll(cPatch, faceI) 
{ 
  
// index of each face
label faceID = faceId_start +faceI;

//id of the owner cell having the face
label faceOwner = faceCells[faceI] ;

....

 }



If there is a better way, do let me know !!
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Thanks and Regards

Vignesh
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Old   July 6, 2016, 11:55
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Praveen Srikanth
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Hey Vignesh,

Thank you so much for that. I did not realise that the face numbers on the patch were going to be continuous.
Code:
	const cell& gasFaces = gasMesh_.cells()[gasPfCellI];
	label gasfaceI = 0;

	forAll(gasFaces, i)
	{
		label gasPatchI = gasMesh_.boundaryMesh().whichPatch(gasFaces[i]);
		if(gasPatchI == gasPatchID_)
		{
			gasfaceI = gasFaces[i];
			Info<<"gasFaceI = "<< gasfaceI<<endl;
		}
	}
I used boundary().faceCells() on the boundary patches to get the cells on the boundary like you did. It seems to work fine as far as I can see. I will let you know if I find something wrong with it. Thanks again.
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boundary cell, chtmultiregionfoam, conjugate heat transfer, face

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