# BOUNDARY CONDITION

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 April 10, 2007, 03:25 BOUNDARY CONDITION #1 MARK Guest   Posts: n/a Hi, someone as an idea about the best boundary condition to simulate the wind flow in a generic area?

 April 12, 2007, 12:54 Re: BOUNDARY CONDITION #2 Adriano Guest   Posts: n/a It's important to consider variable such flow rate, Mach number, ecc... Adriano

 April 13, 2007, 02:37 Re: BOUNDARY CONDITION #3 MARK Guest   Posts: n/a What do you mean exactely? According to me, as the Mach number is defined, this kind of flowing can be considered uncompressible (M<1): do you agree? To relaize this simulation generally I consider a domain with a parallelepiped shape, in which the bottom face is the orography, defined like a no slip face, using k=0.7 and c=0.5; if the wind comes, for example from North, a face is considered like a velocity inlet and the opposite face like a pressure outlet; the two lateral face and the top face like a no shear stress wall. Generally I decrease the underelation coefficient and I use the K-epsilon turbulence model and I always try to obtain, with the region adaptation, 1.000.000 cells. Please let me know what dou you think about. Thanks advanced.

 April 13, 2007, 13:27 Re: BOUNDARY CONDITION #4 Adriano Guest   Posts: n/a I think that a gas is incopressible at M<0.1, however in the case of open geometry, u can use far-boundary condition... try to see fluent manual for details, i think this is better in your case. Adriano

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