Using of DES to simulate separated flow.

Queiroz · May 14, 2013, 08:51

Hi guys,

I'm brand-new to this site and also to simulation. I'm gonna need to simulate a turbulent separation bubble and mean flow. Iwas reading about some approachs concerning to it and DES (Detached-Eddy Simulation) looks to be a good choice. At least better than using "just" RANS. What do you think about it?

Sorry about the errors I might have done with my english,

Queiroz

ghorrocks · May 14, 2013, 20:06

I presume you mean laminar separation bubble - http://www.mh-aerotools.de/airfoils/bubbles.htm You do not normally get turbulent separation bubbles.

You will not get a laminar separation bubble with a normal RANS model. You probably won't get it using DES either. The model to choose is the turbulence transition model - I have modelled laminar separation bubbles with this model successfully.

May 14, 2013, 08:51	Using of DES to simulate separated flow.	#1
Queiroz New Member Join Date: May 2013 Posts: 10 Rep Power: 12	Hi guys, I'm brand-new to this site and also to simulation. I'm gonna need to simulate a turbulent separation bubble and mean flow. Iwas reading about some approachs concerning to it and DES (Detached-Eddy Simulation) looks to be a good choice. At least better than using "just" RANS. What do you think about it? Sorry about the errors I might have done with my english, Queiroz

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
how to simulate backward facein step flow?	mcfd	FLOW-3D	1	April 8, 2012 14:30
Different flow patterns in CFX and Fluent	avi@lpsc	FLUENT	4	April 8, 2012 06:12
Flow meter Design	CD adapco Group Marketing	Siemens	3	June 21, 2011 08:33
How to use DES well?	Daniel	Main CFD Forum	0	October 26, 2008 05:59
simulate a turbulent flow model	lenson	Siemens	3	December 27, 2005 01:27

May 14, 2013, 20:06		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	I presume you mean laminar separation bubble - http://www.mh-aerotools.de/airfoils/bubbles.htm You do not normally get turbulent separation bubbles. You will not get a laminar separation bubble with a normal RANS model. You probably won't get it using DES either. The model to choose is the turbulence transition model - I have modelled laminar separation bubbles with this model successfully.