Polyflow differential viscoelastic flow convergence regarding the evolution of volume flow.

Hello, my name is Shun Yao. Recently I encountered the problem that the calculation cannot converge. I have tried adjusting the dSmin, initial value of dS, dSmax in the evolution parameters. Besides, In addition, I also tried to modify the solver aggressivity. It should be pointed out that I am using a 4-module PTT model. Will this increase the difficulty of convergence?

Could you give me some advice?

Thanks!

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