Advanced use of LES
 

I was wondering in everyones opinion, what is the most advanced use of LES for an engeering application?

In particular what about for gas turbine maybe with or without combustion?

Re: Advanced use of LES
 

How about "WEATHER PREDICTION"

Re: Advanced use of LES
 

Yeah, weather predictions related to fluid flow is one of the most prominent field driving LES.

Vinod Dhiman

Re: Advanced use of LES
 

is weather prediction not quite a large scale phenonemon though, i.e. it doesnt need very fine grids like you might need in as a more enginnering application???

also in weather i suppose the boundary conditions are rahter simplified. isnt it harder when we have walls and things???

Re: Advanced use of LES
 

Weather prediction was the first application of LES in the 1960's. See the seminal paper:

J. Smagorinsky. General circulation experiments with the primitive equations, i. the basic experiment. Monthly Weather Review, 91:99, 164, 1963.

Re: Advanced use of LES
 

In my opinion, it takes too long to be practical in an industry. Recent work by Chan-Moon Jang on subsonic fan for a y+ inside the sublayer took 2.5 months on a supercomp to complete.

Re: Advanced use of LES
 

Hi

System related to weather may have very simpler boundary or intial conditions, but the turbulence is very complicated in this system. In machines you have limited scales, which are important, but in Atmospheric sciences, almost every scale is equally important. That's why LES.

Vinod Dhiman

Re: Advanced use of LES
 

There is no 'most advanced use' of LES for engineering application. TYou may adopt the classical Smagorinsky SGS-model and the dynamic procedure. The numerical scheme must be at least of second order and the nonlinear term is well calculated. In addition, great attention should paid to mesh resolution. I use LES for some engineering design. The headache is the limitation of low Renolds number(Re~10^4). The cost is not as high as imagined. Actually you may succeed using a personal computer.