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Time dependent solver can not converge (Last time step is not converged)

Posted Nov 10, 2021, 5:43 p.m. EST Fluid & Heat, Heat Transfer & Phase Change, Heat Transfer 0 Replies

Mahdi Momeni
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Hi,

I am using the Heat Transfer module, coupled with Fluid Flow to simulate air and water flow in a specific heat exchanger. I have used a step function for the inlet velocities of air and water to smooth the initial values for convergence. However, at a specific time step (where the velocity step function is about to go up), the model would not converge and I get the error of "maximum number of intermediate iterations reached, last time step is not converged". I have tried different mesh qualities but this problem always occurs. Can anyone help what I can do in this condition?

Thanks, Mahdi

0 Replies Last Post Nov 10, 2021, 5:43 p.m. EST
COMSOL Moderator

Hello Mahdi Momeni

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