# who can help me expain the kqrwallfunction,thanks

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 October 26, 2011, 23:27 who can help me expain the kqrwallfunction,thanks #1 Member   张德胜 Join Date: Oct 2011 Posts: 71 Rep Power: 5 the description for kqrwallfunction as follows escription 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.

 October 27, 2011, 04:11 #2 Senior Member   Bernhard Linseisen Join Date: May 2010 Location: Magdeburg/Geneva Posts: 178 Blog Entries: 1 Rep Power: 7 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...

 October 27, 2011, 08:23 #3 Senior Member   Bernhard Join Date: Sep 2009 Location: Delft Posts: 790 Rep Power: 12 R stands for the Reynolds stress, this is a symmetric tensor. For Q I'm not sure.

 October 27, 2011, 09:35 #4 Senior Member   David Boger Join Date: Mar 2009 Location: Penn State Applied Research Laboratory Posts: 146 Rep Power: 8 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. Mojtaba.a likes this. __________________ David A. Boger

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