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-   -   CA much lower than reasonable. (https://www.cfd-online.com/Forums/su2/166580-ca-much-lower-than-reasonable.html)

bmay February 12, 2016 08:49

CA much lower than reasonable.
 
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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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