Effect of turbulence on pressure driven flow

Nero_CMU · January 24, 2016, 19:25

Hi Everyone

I have been trying to run a compressible steady state simulation for pressure driven flow over a flow bench. It's a RANS simulation and I have been using the kEpsilon model. The issue is that the simulation blows up when I run with the turbulence model but runs fine and converges when I turn it off. Same thing happens no matter which turbulent model I choose. The mesh is fine as the same problem happens when I run the simulation on a simple cylindrical geometry with the same boundary conditions. I am not sure why the turbulence solver is having an issue with the pressure boundary conditions.
I have attached the boundary conditions and numerical schemes for my case. Any help will be welcome.
Thanks.

Nero_CMU · January 26, 2016, 17:35

If I use the converged solution (for no turbulence case) as an initial solution and run with turbulence on it still diverges after a couple of iterations. Any suggestions foamers?

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Boudaries for bouynat driven flow with additional mass flux at inlet	Charon	CFX	2	April 27, 2013 08:02
Wrong Pressure countors for channel flow driven by mass flow rate or press gradient	ash-khan	FLUENT	0	June 21, 2009 10:02
pressure BC in buoynacy driven flow	Sasha	FLUENT	3	October 11, 2006 10:08
pressure gradient term in low speed flow	Atit Koonsrisuk	Main CFD Forum	2	January 10, 2002 10:52
what the result is negatif pressure at inlet	chong chee nan	FLUENT	0	December 29, 2001 05:13

January 26, 2016, 17:35		#2
Nero_CMU New Member Nihar Join Date: Oct 2014 Posts: 8 Rep Power: 11	If I use the converged solution (for no turbulence case) as an initial solution and run with turbulence on it still diverges after a couple of iterations. Any suggestions foamers?