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-   -   Boundary condition (http://www.cfd-online.com/Forums/fluent/27464-boundary-condition.html)

Thomas January 27, 2000 06:03

Boundary condition
 
I try to simulate the air flow in a greenhouse. I put the geometry of the greenhouse in a larger domain. My question is the type of boundary condition for the upper part of the domain because if I don't define it, gambit treat it as a wall. Thank you very much.

Volker Pawlik January 27, 2000 10:29

Re: Boundary condition
 
If I understood your problem correctly you want to model a kind of an atmospheric flow. A good way to model the top of such a problem is the symmetry bc if fluxes through the top are negligible. Otherwise you have to use a pressure boundary (with the correct hydrostatic pressure if you are interested in stratification. If I remember it right, Fluent does calculate a pressure stratification only by setting p_ref=0. Otherwise it is not possible to postprocess the p-hyd_static)


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