Decay of turbulence intensity in SST transitional model

Nick R · May 10, 2012, 08:51

Hi all,

I was wondering if you've had any experience with the SST transitional model (gamma theta) in Fluent. I am using the model for flow over a wing but I am struggling with setting up the correct turbulence BCs to get the intensity of about 0.8% near the leading edge of the wing. I have done some trial and error to no avail. What puzzles me is that when I set Tu at 5%, in the solution the Tu contour plot shows values much higher in the region near the inlet where the Tu was set to 5%. I'd appreciate any rules of thumb (provided they exist) to estimate the viscosity ratio and Tu at inlet.

Regards,
Nick

rstewart · April 17, 2014, 18:54

Did you ever have any luck resolving this issue?

I am having a similar problem, and my turbulence intensity is actually increasing when I am expecting it to decay.

Nick R · April 17, 2014, 23:15

I ended up using CFX instead which resolved my issues.

May 10, 2012, 08:51	Decay of turbulence intensity in SST transitional model	#1
Nick R Senior Member Nick Join Date: Nov 2010 Posts: 126 Rep Power: 16	Hi all, I was wondering if you've had any experience with the SST transitional model (gamma theta) in Fluent. I am using the model for flow over a wing but I am struggling with setting up the correct turbulence BCs to get the intensity of about 0.8% near the leading edge of the wing. I have done some trial and error to no avail. What puzzles me is that when I set Tu at 5%, in the solution the Tu contour plot shows values much higher in the region near the inlet where the Tu was set to 5%. I'd appreciate any rules of thumb (provided they exist) to estimate the viscosity ratio and Tu at inlet. Regards, Nick

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
boundary and initial condition for SST k-omga turbulence model	mb.pejvak	Main CFD Forum	3	May 1, 2012 21:06
Low Reynolds k-epsilon model	YJZ	ANSYS	1	August 20, 2010 14:57
K-Omega SST Turbulence Model	nvtrieu	STAR-CCM+	3	July 21, 2010 06:05
SST / turbulence model	PCFD	ANSYS	8	July 13, 2010 17:28
Discussion: Reason of Turbulence!!	Wen Long	Main CFD Forum	3	May 15, 2009 10:52

April 17, 2014, 18:54		#2
rstewart New Member Robbie Join Date: Apr 2014 Posts: 1 Rep Power: 0	Did you ever have any luck resolving this issue? I am having a similar problem, and my turbulence intensity is actually increasing when I am expecting it to decay.

April 17, 2014, 23:15		#3
Nick R Senior Member Nick Join Date: Nov 2010 Posts: 126 Rep Power: 16	I ended up using CFX instead which resolved my issues.