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Flow through manifold: convergence issues

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Old   October 24, 2016, 03:39
Default Flow through manifold: convergence issues
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I try to simulate flow through a manifold with multiple inlets & outlets but I'm facing convergence issues.
I know that it may be due to poor quality mesh, but my mesh statistics are:
  • Minimum Orthogonal Quality = 0.115844
  • Maximum Ortho Skew = 0.853992
  • Maximum Aspect Ratio = 31.8148e
which doesn't look that bad to me.
Another point could be due to wrong BCs and I'm not sure wether my BCs are good. For the inlets I calculated mass flow in the domain (since the manifold is a physical part from a measurement system, I know roughly what the flow field looks like and what the flow in and out my domain is) and set it as mass-flow-inlet BC. For the outlets I also calculated mass flow and set it as pressure-outlet with a good guess for the initial gauge pressure and a target-mass-flow.
But as I said, I don't get a converged solution, is it due to these BCs?

I attach some residual plots. (I wanted to add more but I can only post 2 links...)

If you need more information let me know, I tried to keep it short.

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