Convergence problem?

jacs_lokoo · August 21, 2014, 23:48

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, 17:20

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 21, 2014, 23:48	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, 17:20	hi johan	#2
R4RAHUL New Member rahul kumar Join Date: Jun 2014 Posts: 24 Rep Power: 11	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

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Centrifugal pump OpenFOAM, convergence problem, ANSA model	RDD	OpenFOAM Running, Solving & CFD	0	July 5, 2014 09:12
Convergence Problem in Axisymmetric Periodic Flow	atheresia	FLUENT	3	February 10, 2014 03:00
Force can not converge	colopolo	CFX	13	October 4, 2011 22:03
convergence problem when use pisoFoam, LES for wind tunnel case	Forrest_Lei	OpenFOAM	3	July 19, 2011 06:00
Convergence of CFX field in FSI analysis	nasdak	CFX	2	June 29, 2009 01:17