Application of boundary conditions at cell center

mchurchf · February 2, 2010, 17:56

Hello all,

I would like to implement a wall boundary condition such that nuSGS is specified at the CELL CENTER of the cell adjacent to the wall instead of the cell face.

Can anyone give me any direction in doing this?

Thank you,

Matt

hjasak · February 3, 2010, 05:49

Well, if it is in a cell centre, it is not a boundary condition, right?

I guess what you want to do is to fix a value in a cell by eliminating the equation from the matrix. For this purpose you need something called "constraint". Have a look at how eg a pressure equation fixes the reference level.

Good hunting,

Hrv

herbert · February 4, 2010, 10:42

Hi,

I think you can also use setValues() which is a member of fvScalarMatrix.

Regards
Stefan

February 2, 2010, 17:56	Application of boundary conditions at cell center	#1
mchurchf Member Matthew J. Churchfield Join Date: Nov 2009 Location: Boulder, Colorado, USA Posts: 49 Rep Power: 19	Hello all, I would like to implement a wall boundary condition such that nuSGS is specified at the CELL CENTER of the cell adjacent to the wall instead of the cell face. Can anyone give me any direction in doing this? Thank you, Matt

February 3, 2010, 05:49		#2
hjasak Senior Member Hrvoje Jasak Join Date: Mar 2009 Location: London, England Posts: 1,907 Rep Power: 33	Well, if it is in a cell centre, it is not a boundary condition, right? I guess what you want to do is to fix a value in a cell by eliminating the equation from the matrix. For this purpose you need something called "constraint". Have a look at how eg a pressure equation fixes the reference level. Good hunting, Hrv __________________ Hrvoje Jasak Providing commercial FOAM/OpenFOAM and CFD Consulting: http://wikki.co.uk

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February 4, 2010, 10:42		#3
herbert Senior Member Stefan Herbert Join Date: Dec 2009 Location: Darmstadt, Germany Posts: 129 Rep Power: 17	Hi, I think you can also use setValues() which is a member of fvScalarMatrix. Regards Stefan