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January 23, 2001, 12:41 |
DNS and LES?
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#1 |
Guest
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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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January 24, 2001, 04:09 |
Re: DNS and LES?
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#2 |
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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. Sylvain |
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January 24, 2001, 12:23 |
Re: DNS and LES?
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#3 |
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hi there,
check the following link: http://www.ionasoftware.com/gross/fl...urbulence.html you'll find all the info you need about DNS & LES. you can also go to Ugo Piomelli's publications website: http://www.glue.umd.edu/~ugo/research/publications.html you'll be able to download a lot of papers and more about DNS and LES. Sincerely, Frederic Felten CFD Lab, UT Arlington. http://utacfdb.uta.edu/ |
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January 26, 2001, 01:06 |
thanks
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#4 |
Guest
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Thank a lot, it is a great help.
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