|July 12, 2011, 07:43||
the difference between DES and WMLES?
Join Date: Jan 2010
Posts: 26Rep Power: 8
I got some confusion between DES and WMLES, I don`t know whether the WMLES belongs to DES or they are two different method of hybird RANS/LES. I think the WMLES is derivated from DES97 and DDES(somebody call it DES2006), so it is also one kind of DES. Because WMLES just modelled the boundary layer by RANS and this is same to DES.
Am I right?
|August 3, 2012, 10:28||
Join Date: Jul 2010
Posts: 54Rep Power: 8
you should take a look at this paper:
A hybrid RANS-LES approach with delayed-DES and wall-modelled LES capabilities
Mikhail L. Shur a, Philippe R. Spalart b, Mikhail Kh. Strelets a,*, Andrey K. Travin a
a New Technologies and Services, 14, Dobrolyubov Avenue, 197198 St. Petersburg, Russia
b Boeing Commercial Airplanes, P.O. Box 3707, Seattle, WA 98124, USA
|August 6, 2015, 12:19||
Join Date: May 2010
Location: Leuven (Belgium)
Posts: 35Rep Power: 8
I have a question regarding this old topic, or better I would like a clarification to understand if I what I have in mind is correct.
In fluent user guide, both IDDES and WMLES are referring to the same paper of Shur, where the IDDES formulation is specified and which consists of two branches, the DDES and the WMLES.
Anyway, from what I understood the two methods, DDES and WMLES, are both hybrid methods, coupling the RANS and the LES equation.
Now my clarification is about the difference between them which I will try to specify below, and hopefully someone can comment it
From what I understood the difference is that the DES (or DDES) method is trying to use the RANS equation in the entire BL, while the WMLES is using RANS only in the very near wall.
This is performed changing the way the characteristic length is defined.
Moreover I cannot find in the WMLES method which kind of RANS equations are applied. Also in Fluent the WMLES is written that it is solved using an algebraic method, which should be the Prandtl's mixing layer.
Is it correct?
|wmles des difference|