Boundary Condition for LES

Krishna

Hi,

I am trying to incorporate strandard model of LES into an existing code, the "Smagorinsky-Lilly Model", and I am trying to validate the code using a simple channel flow case, with Velocity INLET and an OUTFLOW boundary condition.

As I have read that there should be a fluctutation velocity that should be given to INLET at the begining of every timestep, I am finding difficult to implement the same, in the code, as one of the models suggest to develop a ramdom number, and multiply the same with the modulus of veloctiy, and add it to the freestream.

Is this model, fair enough or should I use some other way of generating the fluctutation velocity. What material can I refer to get some idea.

Your Help in this Regard will be appreciated.

Thanks in Advance,

Krishna.