Good day!

I have encountered a problem while running static analysis. The problem is that the analysis sometimes converge and sometimes does not (using the same model).
---The situation is that I have this 54" size Flare Line pipe and when I tried to run this in static analysis it does not converge so I change the "friction stiffness normal default value" in the configuration setup to its "lowest default value" then the analysis converge. But, when I try again the "friction stiffness normal default value" (using the same model) it will now converge. Why is this so? Please explain to me regarding this problem. Thank you.

Best Regards,
Ian