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Near wall modeling in LES

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Old   January 26, 2006, 02:53
Default Near wall modeling in LES
  #1
Wee
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Hi everyone,

Do you know how to numerically implement Werner & Wengle (1991)'s near wall modeling?

Thank you.
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Old   January 26, 2006, 03:40
Default Re: Near wall modeling in LES
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kharicha
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should be easy,

Write an Profile UDF for the velocity u as a function of y+, something like :

if y+<=11.81 u+=y+; else u+ =8.3*(y+)^(1/7);

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Old   January 26, 2006, 04:33
Default Re: Near wall modeling in LES
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zxaar
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I do not think he is talking about fluent, second if he is talking about fluent, werner-wengle is already available , so he does not need to write UDF.

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Old   January 26, 2006, 05:22
Default Re: Near wall modeling in LES
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Wee
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Thanks to Kharicha and zxaar.

The near wall velocity distributions are described in wall units, I don't know whether I need to determine the friction speed first. I also cannot derive the wall shear stress corresponding to the power law distribution given by Werner & Wengle (1991).

I have another question: Is the wall shear stress used as approximate boundary conditions like Numann type?
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Old   January 26, 2006, 10:03
Default Re: Near wall modeling in LES
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zxaar
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should have some literature related to this, tomm. i will search my pdf lib if i could find some thing related to implementing i will drop you an email.
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