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Old   April 10, 2007, 03:25
Default BOUNDARY CONDITION
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MARK
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Hi, someone as an idea about the best boundary condition to simulate the wind flow in a generic area?
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Old   April 12, 2007, 12:54
Default Re: BOUNDARY CONDITION
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Adriano
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It's important to consider variable such flow rate, Mach number, ecc...

Adriano
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Old   April 13, 2007, 02:37
Default Re: BOUNDARY CONDITION
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MARK
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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.
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Old   April 13, 2007, 13:27
Default Re: BOUNDARY CONDITION
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Adriano
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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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