Spalart Allmaras Gamma Re Theta Model

taxalian · May 9, 2013, 15:14

Hi SU2 Users,
I have tried to compute the NREL S-series wind turbine airfoil s809 test case available in SU2 v2.0.3 developers release.

The transition model implemented seems to be the γ−Reθt−SA model, introduced by Medida et al.

The problem is that the simulation diverges everytime few iterations and the residual of SA-eddy viscosity results in nan.

I tried to adjust the intermittency factor and the freestream turbulence intensity but does not help at all. I think this should not be the case normally at AoA=0°.

May be the model is not yet implemented completely or i don't what other issues causes the simulation not to converge.

May be it's also a good idea if we can have an input parameter that defines the freestream viscosity ratio i.e. mu_turb / mu_lam

Waiting for your reply.

Thanks in advance.

aniketaranake · May 14, 2013, 14:36

Dear Taxalian,

The transition model is not yet fully implemented and is not ready for use. Sorry for the inconvenience.

Regards,
Aniket

taxalian · May 14, 2013, 15:58

Hi Aniket,
Thanks for the reply and info. Hope this will be available in the SU2 regular version release.

taxalian · October 4, 2013, 05:45

Is the γ−Reθt−SA/SST turbulence model available in github is in fully functional mode now. I tried to run again the similar test case mentioned earlier in this thread, but no success. The code just stopped after performing Mulitgrid agglomeration.

jdp810 · December 14, 2020, 05:45

Sorry for resurrecting this thread, but are there any news about the implementation of this transition model?
Thank you

May 9, 2013, 15:14	Spalart Allmaras Gamma Re Theta Model	#1
taxalian Senior Member Join Date: Nov 2010 Posts: 139 Rep Power: 16	Hi SU2 Users, I have tried to compute the NREL S-series wind turbine airfoil s809 test case available in SU2 v2.0.3 developers release. The transition model implemented seems to be the γ−Reθt−SA model, introduced by Medida et al. The problem is that the simulation diverges everytime few iterations and the residual of SA-eddy viscosity results in nan. I tried to adjust the intermittency factor and the freestream turbulence intensity but does not help at all. I think this should not be the case normally at AoA=0°. May be the model is not yet implemented completely or i don't what other issues causes the simulation not to converge. May be it's also a good idea if we can have an input parameter that defines the freestream viscosity ratio i.e. mu_turb / mu_lam Waiting for your reply. Thanks in advance.

October 4, 2013, 05:45	γ−Reθt−SA/SST turbulence model	#4
taxalian Senior Member Join Date: Nov 2010 Posts: 139 Rep Power: 16	Is the γ−Reθt−SA/SST turbulence model available in github is in fully functional mode now. I tried to run again the similar test case mentioned earlier in this thread, but no success. The code just stopped after performing Mulitgrid agglomeration.

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May 14, 2013, 14:36		#2
aniketaranake New Member Join Date: Dec 2011 Posts: 22 Rep Power: 14	Dear Taxalian, The transition model is not yet fully implemented and is not ready for use. Sorry for the inconvenience. Regards, Aniket

May 14, 2013, 15:58		#3
taxalian Senior Member Join Date: Nov 2010 Posts: 139 Rep Power: 16	Hi Aniket, Thanks for the reply and info. Hope this will be available in the SU2 regular version release.

December 14, 2020, 05:45		#5
jdp810 Member Jose Daniel Join Date: Jun 2020 Posts: 36 Rep Power: 6	Sorry for resurrecting this thread, but are there any news about the implementation of this transition model? Thank you