Des

zxcvasdf · October 2, 2016, 13:31

Hi
is there anybody who could help me to know what is DES method applications?
also for an airfoil with high angle and seperation could it be used?
Thanks

LuckyTran · October 6, 2016, 01:17

DES is a cheaper way of doing LES. Rather, it is a technique that is tailored towards letting you run LES-like simulations in computationally less expensive way. I suggest learning what LES is, because the purpose of DES is to mimick LES.

Yes, it can be applied to airfoils at just about any angle of attack. In LES there is no explicit turbulence model, there is no model on the filtered variables and all that remains is a subgrid scale model on the unfiltered parts.

zxcvasdf · October 6, 2016, 05:16

Thanks for your answer
can i use DES for 2d problems ? or it is like LES just for 3d problems?

October 2, 2016, 13:31	Des	#1
zxcvasdf Member zxc Join Date: Mar 2015 Posts: 35 Rep Power: 11	Hi is there anybody who could help me to know what is DES method applications? also for an airfoil with high angle and seperation could it be used? Thanks

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Spanwise Length and Grid Refinement for SAS-SST, DES, and LES	Josh	CFX	5	October 14, 2010 19:47
How to use DES well?	Daniel	Main CFD Forum	0	October 26, 2008 05:59
DES ( SA+LES) vs DES ( kwSST+LES) for bluff body	Phil	Main CFD Forum	0	January 8, 2008 09:04
Problem with DES analysis	mehul	CFX	7	April 25, 2006 07:57
Problem with DES model	mehul	Siemens	0	April 12, 2006 08:01

October 6, 2016, 01:17		#2
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,673 Rep Power: 65	DES is a cheaper way of doing LES. Rather, it is a technique that is tailored towards letting you run LES-like simulations in computationally less expensive way. I suggest learning what LES is, because the purpose of DES is to mimick LES. Yes, it can be applied to airfoils at just about any angle of attack. In LES there is no explicit turbulence model, there is no model on the filtered variables and all that remains is a subgrid scale model on the unfiltered parts.

October 6, 2016, 05:16		#3
zxcvasdf Member zxc Join Date: Mar 2015 Posts: 35 Rep Power: 11	Thanks for your answer can i use DES for 2d problems ? or it is like LES just for 3d problems?