Filtered navier stokes equation..LES::
hI ! FOR Large eddy simulation´,,,I have seen that , we r usin filtered navier stokes equation..Is the same one like Avaraged Navier stokes....or ????
reply me 
Re: Filtered navier stokes equation..LES::
Reynolds equations are timeaveraged NS while LES are spatially filtered NS.

Filtered navier stokes equation..LES::once again
hello !!!
In Rynolds averaged navier stokes equation..... we are having variables for example ...(Velicoty) v = V(Time averaged) + v'( Fluctutating term) this V (time averaged) values are obtained by takin average of all the values over time.... Similarly for Filtered equations we are applying spatial filters..... what s the mathtematical idea behind that one??? 
Re: Filtered navier stokes equation..LES::once aga
http://en.wikipedia.org/wiki/Large_eddy_simulation
I guess you average the velocity on each computational cell and that leads you to introduce a new term. For Reynoldsaveraged NS your new term will be Reynolds stress, and for LES it will be eddy viscosity. Then you will link this eddy viscosity to the averaged velocity components in some new equation. OK... as you can read I can not go much more beyond this basic description of LES, sorry. 
I m also trying to understand same problem.. i guessed smthing like below
filtering on u = u(filtered) but filtering on u*u != u(filtered)*u(filtered) i dont know whether it is right or wrong.. comments please 
Reylnolds averaging
Hello
I have solved NS equation in serial of six papers by spatial averaging enstead of velosity, as did Reynolds. Read my first one in Journal of Engineering and Technology Research; June 2011; 3(6) www.academicjournals.org/jetr/contents/2011cont/Jun.htm  Cached You +1'd this publicly. Undo Asya S. Skal. Does a physically reasonable solution of the Navier Stokes equations. exist? [Abstract] [Full Text] [Full Article  PDF] pp. 168170 ... 
I must admit I have a hard time understanding why this paper was accepted... I have never heard of this journal as well.... Am I just being ignorant, or is this fishy?
I think digging up old threads to plug one's papers is not the most helpful approach either.. 
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