incompressible DNS

leguichet · March 29, 2014, 06:00

Hi,

I am wondering if SU2 is capable to do some DNS for incompressible flow. I read something online and found that the incompressible model is based on the articifial compressibility (valid for steady state). Does it mean that the solver can not deal with unsteady problem like the Von Karman wall street problem after a cylinder?

However, I found a case in the test_cases files of a cylinder at Re=60. It seems controversary from all these informations gathered online. Anybody knows some details about this?

By the way, can we use SU2_EDU to do incompressible DNS for unsteady flow?

Thank you

hlk · June 5, 2014, 15:07

Thank you for your interest in SU2.
SU2 is a finite-volume based CFD solver. This is significantly different from DNS, which may be why this seems confusing. Unsteady simulations are possible with SU2, unfortunately we do not have any current tutorials on this subject. If you need an example of unsteady cases, I encourage you to explore the TestCases/Unsteady_* folders.
Steady solutions can be computed on physically unsteady problems, you can consider it as a mean flow.

March 29, 2014, 06:00	incompressible DNS	#1
leguichet New Member gao Join Date: Feb 2014 Posts: 7 Rep Power: 12	Hi, I am wondering if SU2 is capable to do some DNS for incompressible flow. I read something online and found that the incompressible model is based on the articifial compressibility (valid for steady state). Does it mean that the solver can not deal with unsteady problem like the Von Karman wall street problem after a cylinder? However, I found a case in the test_cases files of a cylinder at Re=60. It seems controversary from all these informations gathered online. Anybody knows some details about this? By the way, can we use SU2_EDU to do incompressible DNS for unsteady flow? Thank you

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Incompressible turbulence models: strange implementations?	AleDR	OpenFOAM	3	November 18, 2014 11:23
DNS Incompressible : poisson order and Div(Ui)	moomba	Main CFD Forum	8	May 26, 2009 08:17
Abt: the speed of sound in incompressible flows	jinwon park	Main CFD Forum	3	August 21, 2008 20:44
Compressible vs. Incompressible formulations	Fernando Velasco Hurtado	Main CFD Forum	3	January 7, 2000 16:51
DNS of incompressible NS 2D/3D	Andy	Main CFD Forum	6	June 29, 1999 15:34

June 5, 2014, 15:07		#2
hlk Senior Member Heather Kline Join Date: Jun 2013 Posts: 309 Rep Power: 13	Thank you for your interest in SU2. SU2 is a finite-volume based CFD solver. This is significantly different from DNS, which may be why this seems confusing. Unsteady simulations are possible with SU2, unfortunately we do not have any current tutorials on this subject. If you need an example of unsteady cases, I encourage you to explore the TestCases/Unsteady_* folders. Steady solutions can be computed on physically unsteady problems, you can consider it as a mean flow.