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who can help me expain the kqrwallfunction,thanks

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Old   October 26, 2011, 23:27
Smile who can help me expain the kqrwallfunction,thanks
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张德胜
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the description for kqrwallfunction as follows
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Boundary condition for turbulence k, Q, and R when using wall functions.
Simply acts as a zero gradient condition.
who can tell me what do the Q and R represent? i do not find the paraments of Q,R in my case.
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Old   October 27, 2011, 04:11
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Bernhard Linseisen
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I do not know for sure, but I would assume - please check and correct me, if wrong! - that R stands for the Reynolds number.
Q quite often is used for a flux, so it is tempting to assume it is the same here...
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Old   October 27, 2011, 08:23
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Bernhard
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R stands for the Reynolds stress, this is a symmetric tensor. For Q I'm not sure.
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Old   October 27, 2011, 09:35
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David Boger
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The LRR model, for example, solves an equation for R, which is the Reynolds stress tensor. In turbulence, q is traditionally the square root of k (tke); the qZeta model, for example, solves an equation for q.
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