I'm running a steady flow simulations in Fluent. I'm using default settings for monitoring residuals (0,001) and my simulation convergates at 300 iterations and I get lift coefficient Cl around 4. I run same simulation again just put residuals to stop when decreased at 0,0001 and my solution convergates at 1600 iterations and I get lift coefficient around 8.... and I'm watchnig residuals diagram and in both simulations it looks good. From start it lineary goes down.
Can somebody please explain that big difference? I did that on few simulations and always get about doubled Cl.
In your case, it might be helpful to monitor metrics related to shear stress in the surfaces of interest, as well as lift and drag forces.
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