Cell average on cross section plane

David_010 · June 10, 2016, 09:28

Dear Foamers,

I'm working on solving the dimensionless temperature in a duct. I need, for each iteration, to substrac the average value of all the cells in the same cross section to those cells, in order to have the average equal to 0. This has to be done for each cross section of the duct.

Im trying to do it by suing the for loop:

Code:

forAll(mesh.cells(),cellI)
{
// Loop over all the cells in the mesh
++numCells_1;

......

}

but I realli dont know how to average only the cells on a cross section of the duct (z constant) and then substract that value to those cells.

Any help is welcome.

Thanks in advance,

David

agustinvo · June 10, 2016, 11:35

Hola David

The idea to do it should average for each value of z (the direction of you flow), but I don't know ho to do that. Do you need it during you simulation? Otherwise you can postprocess your data after the simulation.

Another idea should be to modify your temperature in order to have an approximate value to 0 in your domain, so modifying your temperature BC.

June 10, 2016, 09:28	Cell average on cross section plane	#1
David_010 Member David Join Date: Dec 2009 Location: Spain Posts: 62 Rep Power: 16	Dear Foamers, I'm working on solving the dimensionless temperature in a duct. I need, for each iteration, to substrac the average value of all the cells in the same cross section to those cells, in order to have the average equal to 0. This has to be done for each cross section of the duct. Im trying to do it by suing the for loop: Code: forAll(mesh.cells(),cellI) { // Loop over all the cells in the mesh ++numCells_1; ...... } but I realli dont know how to average only the cells on a cross section of the duct (z constant) and then substract that value to those cells. Any help is welcome. Thanks in advance, David

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June 10, 2016, 11:35		#2
agustinvo Senior Member Agustín Villa Join Date: Apr 2013 Location: Alcorcón Posts: 313 Rep Power: 15	Hola David The idea to do it should average for each value of z (the direction of you flow), but I don't know ho to do that. Do you need it during you simulation? Otherwise you can postprocess your data after the simulation. Another idea should be to modify your temperature in order to have an approximate value to 0 in your domain, so modifying your temperature BC.