Dynamics LES

Kilda

HI all,

I am trying to simulate channel flow using dynamic LES.

As there is a 2 step process of Filtering required, in order to calculate the the constant 'Cs', I am not able to figure out how to calulate the same.

Using the grid filter, I am able to calculate the Sij(overbar), but when the same is processed through the Test filter, the Sij(overbar) becomes Sij(overbar,tilda)[Sorry for the conventions], how do I go about calculating the later (in terms of coding) and also the Co-efficient on the whole.

Is it also fine, if I use a Test filter that is twice the size of the grid filter ?

Any takers,

thanks in advance,

Kilda.