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Fix PMPI_Abort in two_phase_flow/MultiPhase. #226

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Fixes #224. Related to #219.

Always rebuilding velocity preconditioners fixes the BoomerAMG issue.

However, I believe that this fix only masks the actual problem, and does not solve it. For instance, the program TestNavierStokes works fine.

I am fine with this solution though, as I have other problems to work on and already spent a significant amount of time on this. Do you agree with this patch?

@manuel-quezada -- FYI

@marcfehling marcfehling mentioned this pull request Jul 9, 2025
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It seems reasonable to rebuild the preconditioner if you rebuild the matrix.

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bangerth commented Jul 9, 2025

Let's give @manuel-quezada a day or two to respond before we merge this.

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two_phase_flow crashes during time step 2
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