LES:where does the value C belong to in FVM
 

hi,all,i am going on the dynamic SGS model,using Germano's modeling theory and extending it to the compressilbe flow.
The equation for solving the model coefficient is C=LijMij/MijMij.
I use the finite volume method to program,when i am programming, i find a question,where is the value C(x,y,z,t) put?the cell face or cell center?
In the FVM,we finally get the face strain rate tensor which need the face value C(x,y,z,t).

How do you deal with the value C?please help me