Convergence problem?

jacs_lokoo · August 22, 2014, 00:48

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.

help pls

R4RAHUL · September 15, 2014, 18:20

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

August 22, 2014, 00:48	Convergence problem?	#1
jacs_lokoo New Member Johann Join Date: Jun 2014 Posts: 2 Rep Power: 0	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. help pls

September 15, 2014, 18:20	hi johan	#2
R4RAHUL New Member rahul kumar Join Date: Jun 2014 Posts: 24 Rep Power: 12	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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