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Reynolds Stress model in CFX vs Fluent

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Old   December 6, 2005, 22:09
Default Reynolds Stress model in CFX vs Fluent
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Hi.. I currently have access to both CFX & Fluent 6. I've done some simulation in CFX5.7.1 before and wish to compare the same model in Fluent. CFX5.7.1 has a range of Reynodls Stress Model:

1.SSG model developed by Speziale,Sarkar & Gatski,

2.LRR-IP (isotropisation for production) & -QI (Quasi-Isotropic) developed by Launder,Reece & Rodi

3.Baseline omega model Stress model

From what I read from Fluent manual, Reynolds stress model used in Fluent 6 is developed by Gibson & Launder, Launder, and Launder et al.

Does anyone know if Fluent's RST model is the same as LRR-IP or LRR-QI used in CFX? I notice that in Fluent the constant Ce1=1.44,Ce2=1.92,C_mu=0.09 etc... whie in CFX the constant Ce1=1.45,Ce2=1.9,C_mu=0.1152 etc for LRR-IP... Are they the same model?

Thanks for your information. Cheers,Tim

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Old   October 7, 2009, 06:19
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Glenn Horrocks
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I don't know the details of the RSM models, all I can suggest is you compare the constants and modelled equations and check they are the same.

Don't forget that the numerics of Fluent and CFX are very different so even if the model is the same it would not surprise me to get quite different results.
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