Using of DES to simulate separated flow.

Queiroz · May 14, 2013, 09:51

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, 21:06

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, 09:51	Using of DES to simulate separated flow.	#1
Queiroz New Member Join Date: May 2013 Posts: 10 Rep Power: 13	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

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May 14, 2013, 21:06		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,872 Rep Power: 144	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.