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COMSOL Failed to find a solution error

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Hello,

I am getting an error message:

Failed to find a solution.
Maximum number of Newton iterations reached.
Returned solution is not converged.
- Feature: Stationary Solver 1 (sol1/s1)

This message comes whenever I increase the density of the liquid in a simple laminar fluid flow in channel. I have volume forces in a certain part of the channel.

Is there a way to avoid getting this message?

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