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-   -   Convergence problem? (https://www.cfd-online.com/Forums/fluent/140740-convergence-problem.html)

jacs_lokoo August 22, 2014 00:48

Convergence problem?
 
Hello, this is my first post, i'm actually a new user to ANSYS FLUENT.

I'm in the design process of an airfoil, i did my mesh(ICEM) and the quality tells me i'm over 0.8 in all the mesh.

When i run the FLUENT analysis, it always converges on 0 to 12° AoA, even though i think i'm wrong the AoA vs Cl plots a very nice curve.

I don't really know if that's correct.

I used Trans SST coupled and second order upwind with pseudo transient active. When iterating approximately at 160 to 180 it converges, the residuals also converge. :confused::(:(:(:(:(:(:(:(:(

help pls

R4RAHUL September 15, 2014 18:20

hi johan
 
may be you can decrease your time step-size or select as adaptive instead of fixed and convergence also depends on courant number so you can check that as well


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