[dasssj]

Hi,guys!

I'm using SU2(4.0.2) for CFD research, and I have some questions about the residual of SU2.

In my case(M100 wing, Ma=0.8027, Re=11.31E6, AoA= 2.873), the residual(Res_Flow[0]) has already very small(-8) after 10000 iterations, but the force coefficients(Cl,Cd) have not converged.

Is it the problem of the mesh or the setting of the configuration?

Best regards,

Jason Shih

[hlk]

Originally Posted by dasssj

Hi,guys!

I'm using SU2(4.0.2) for CFD research, and I have some questions about the residual of SU2.

In my case(M100 wing, Ma=0.8027, Re=11.31E6, AoA= 2.873), the residual(Res_Flow[0]) has already very small(-8) after 10000 iterations, but the force coefficients(Cl,Cd) have not converged.

Is it the problem of the mesh or the setting of the configuration?

Best regards,

Jason Shih

Sorry for the delay in reply.
Based on your plots it is not yet converged. The residual has reduced by less than an order of magnitude, generally we look for at least 4 orders of magnitude reduction (so, a log(residual) of -12 in your case). Tools like the multigrid, and CFL parameters may be useful in accelerating the convergence.