How to solve this formula?
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Hi guys,
I am a newbie on this model. I need you help on this. This is a model called gaoyong turbulence model. "Partialaveragebased equations of incompressible turbulent flow" Ge Gao. Yan Yong. In this model, we have a equation like this:see the attached image. We know u and p. tau can be expressed by vector l. The right of this equation is a little different with the normal NS equation. There is a vector l , and the whole right part, which is different with the NS equation, is a inner product of two vectors. Im using FVM. So now I dont know how to discretize it. Any ideas will be appreciated. Thanks in advance. 
Any ideas? Thanks.

A little progress:
In the equation I posted, I should solve the mag(l). But how? I dont know. 
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