Distinction between k-w sst and SA turbulence model in SU2

ari003 · November 10, 2021, 10:32

Hello everyone,
Hope you all are doing well. I came across a specific doubt that might be very simple for others and I would really appreciate if they can share their understanding with me. The description is as follows:-

I am running an airfoil simulation at M=0.8 with k-w SST and S-A turbulence model. My aim was to analyze how the y+ varies along the upper surface of the airfoil and the plot is attached beneath. Also, there is a significant difference in Cl value for the both, 0.26 for k-w SST while 0.025 for S-A. I am wondering what causing this huge difference in Cl values?
If I take a dig in y+ formulation it seems like the eddy viscosity calculation in both the case is making the difference.

So my question is, whether the script for the SA case (attached) is in correct order or not? Also, if anyone is aware of SA-LM or SA-BC does either of the one will give better result compared to standard S-A model in case of airfoil case?

ari003 · November 28, 2021, 03:17

Is there anyone who can shed their insightful to my doubt? Will remain grateful.

pcg · December 2, 2021, 11:12

No it's not normal to have 10x difference in Cl with different turbulence models.

You are posting your questions in the wrong sections, this is not news or announcements, it should be in the general section.

November 28, 2021, 03:17		#2
ari003 Senior Member Arijit Saha Join Date: Feb 2019 Location: Singapore Posts: 132 Rep Power: 7	Is there anyone who can shed their insightful to my doubt? Will remain grateful.

December 2, 2021, 11:12		#3
pcg Senior Member Pedro Gomes Join Date: Dec 2017 Posts: 466 Rep Power: 14	No it's not normal to have 10x difference in Cl with different turbulence models. You are posting your questions in the wrong sections, this is not news or announcements, it should be in the general section.