A question about boundary condition??

lfgmarc · June 21, 2011, 22:13

Hi, I trying to setup a case, in which I need that the inlet pressure changing according to the value of the outlet pressure. any suggestion ?

Best Regards, and thanks for your help

fg

wschosta · June 22, 2011, 18:08

one possible solution is as follows:

if your inlet condition needs to be the same as your outlet you could make the walls at your inlet and outlet cyclic (periodic) which would basically mean that anything going out the outlet would come back in through the inlet. The problem with that is it also preserves any funky things going on with your fluid. And because the pressure is changing I'm guessing some funky things are happening.

that said I've tried my own interesting wall conditions and you might want to look at swak4foam, it was recommended to me while I was on my quest. It's an additional library that allows you to use equations for the boundary conditions. I didn't end up using it so I don't really know much more about it besides that.

best of luck!

Walter

June 21, 2011, 22:13	A question about boundary condition??	#1
lfgmarc Member Luis Felipe Gutierrez Marcantoni Join Date: Oct 2010 Location: Cordoba-Argentina Posts: 47 Rep Power: 16	Hi, I trying to setup a case, in which I need that the inlet pressure changing according to the value of the outlet pressure. any suggestion ? Best Regards, and thanks for your help fg __________________ Felipe G

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June 22, 2011, 18:08		#2
wschosta Member Walter Schostak Join Date: May 2011 Posts: 35 Rep Power: 15	one possible solution is as follows: if your inlet condition needs to be the same as your outlet you could make the walls at your inlet and outlet cyclic (periodic) which would basically mean that anything going out the outlet would come back in through the inlet. The problem with that is it also preserves any funky things going on with your fluid. And because the pressure is changing I'm guessing some funky things are happening. that said I've tried my own interesting wall conditions and you might want to look at swak4foam, it was recommended to me while I was on my quest. It's an additional library that allows you to use equations for the boundary conditions. I didn't end up using it so I don't really know much more about it besides that. best of luck! Walter