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Simulation Not Converge

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Hello, I'm quite new in COMSOL, and I want to ask something about simulation not converge.

So, now I am modelling a venturimeter effect in pulsatile flow. When I try to simulate my model with relative tolerance in 0.05 or smaller I always got this message:

Repeated error test failures. May have reached a singularity. Time : 0 Last time step is not converged.

But when I make my relative tolerance higher than 0.05, my simulation works and have a fine result.

Is there something I can try to revise if I want to my simulation work but with relative tolerance smaller than 0.05?


0 Replies Last Post 21 juin 2021, 09:41 UTC−4
COMSOL Moderator

Hello Astuto Santosa

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