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Very ill-conditioned preconditioner.

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Hi-

I am modeling a fluid flow in a pipe that is ~15 meters long with a reducer on each end of the pipe. This pipe will eventually become a chemical reactor. I obtained the following message about the conditioner.


Failed to find a solution.
In segregated group 1:
Very ill-conditioned preconditioner.
The relative residual is more than 1000 times larger than the relative tolerance.
Returned solution has not converged.


Should I mesh the geometry differently, or is there another reason this is happening?

--
JDP

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