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-   -   who can help me expain the kqrwallfunction,thanks (http://www.cfd-online.com/Forums/openfoam/93801-who-can-help-me-expain-kqrwallfunction-thanks.html)

hei@ge October 26, 2011 23:27

who can help me expain the kqrwallfunction,thanks
 
the description for kqrwallfunction as follows
:Description
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.

Linse October 27, 2011 04:11

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...

Bernhard October 27, 2011 08:23

R stands for the Reynolds stress, this is a symmetric tensor. For Q I'm not sure.

boger October 27, 2011 09:35

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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