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Old   July 28, 2009, 23:50
Default Turbulence models
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MARK
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Hello everyone I am using Phoenics for studying wind environment in downtown area,
Could you please tell me which Turbulence model is better for evaluation of wind environment in downtown area?
I try to use the KEMMK in KE Variants, is that ok?
but i found it looks the same as KEMODL according the the constants in both of them,

also can i change the roughness parameter in the setting of this RANS model, i want to change it to 0.27 the same as i did in wind tunnel experiments.

Thank you very much for your help
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Old   July 29, 2009, 09:57
Default statistical turbulence models for wind engineering
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michael malin
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The Kato-Launder & Murakami et al variants of the k-e model are reported to perform better than the standard k-e model for flow around buildings. Both are available in PHOENICS, and they are documented here:

http://www.cham.co.uk/phoenics/d_pol...od/enc_mmk.htm

The empirical constants of the standard model are retained, but differences arise in the modelling practices, i.e. modified production rate or eddy-viscosity relationship. The main issue is to improve the representation of irrotational strain.
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Old   July 30, 2009, 00:16
Default Thank you
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Thank you very much it is very helpful
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Old   January 18, 2010, 14:44
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ok
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salut I want to enter the velocity like V=ax+b on a in a bubbly two phase flows




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x-_______> flows
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y
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