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Old   January 23, 2001, 13:41
Default DNS and LES?
Junseok Kim
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Hi, I wonder what those are?

DNS and LES?

Are there any easy references for those?

Thank you~

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Old   January 24, 2001, 05:09
Default Re: DNS and LES?
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DNS = Direct Numerical Simulation; LES = Large Eddy Simultion

For DNS you solve exactly the Navier Stokes equations in time and space. That's mean you have to use a grid fine enought to catch all the scales of the turbulence.

For LES, only large eddies are solve and dissipative effect of small scales is usualy modelize throught a viscosity (SGS model = Sub-Grid Scale Model).

You may look to the following article :

P. R. Spalart - 1999 - Strategies for turbulence modelling and simulations Engineering Turbulence Modelling and Experiments 4 - W. Rodi and D. Laurence (Editors) - Elseviers

It gives a good introduction to the different ways use to solve the turbulence problem in CFD. The bibliography of this paper may give you some indication about references you are looking for.

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Old   January 24, 2001, 13:23
Default Re: DNS and LES?
frederic felten
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hi there,

check the following link:

you'll find all the info you need about DNS & LES.

you can also go to Ugo Piomelli's publications website:

you'll be able to download a lot of papers and more about DNS and LES.


Frederic Felten CFD Lab, UT Arlington.
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Old   January 26, 2001, 02:06
Default thanks
Junseok Kim
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Thank a lot, it is a great help.

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