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

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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