CA much lower than reasonable.

bmay · February 12, 2016, 08:49

I am working on a case that is giving me answers I don't believe. The CFx value I'm getting out of SU2 is about 2.6. Using the rule of thumb of a Cd value of ~2 and calculating the CFx value given the largest cross-sectional area and Sref values, the Cfx should be closer to 13. Can you please take a look at my input file and see if there is some glaring error that I'm missing?
Thank you.

fpalacios · February 12, 2016, 20:41

The input file seems OK. But, if I were you, I would run it without Multigrid. Could you please post the convergence history and some pictures of the grid? Have you check the y+?

Best,
Francisco

bmay · February 13, 2016, 09:12

My y+ values should be ok. I plotted it out in Paraview, and got values of 0.4 to 26 or so. Unfortunately I can't post pictures of the grid at this time. I will try without multigrid.
Thank you

fpalacios · February 13, 2016, 10:07

Please remember that SA requires a y + <1.0 on the surface. a convergence plot would be useful.
Best,
Francisco

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February 12, 2016, 20:41		#2
fpalacios Super Moderator Francisco Palacios Join Date: Jan 2013 Location: Long Beach, CA Posts: 404 Rep Power: 15	The input file seems OK. But, if I were you, I would run it without Multigrid. Could you please post the convergence history and some pictures of the grid? Have you check the y+? Best, Francisco

February 13, 2016, 09:12		#3
bmay New Member Brittany Join Date: Jan 2016 Posts: 3 Rep Power: 10	My y+ values should be ok. I plotted it out in Paraview, and got values of 0.4 to 26 or so. Unfortunately I can't post pictures of the grid at this time. I will try without multigrid. Thank you

February 13, 2016, 10:07		#4
fpalacios Super Moderator Francisco Palacios Join Date: Jan 2013 Location: Long Beach, CA Posts: 404 Rep Power: 15	Please remember that SA requires a y + <1.0 on the surface. a convergence plot would be useful. Best, Francisco