my solution ratio doesnt converge, need help

chris_z
chris_z Altair Community Member
in Community Q&A

Hello! I am still pretty new to altair hypermesh CFD. So while I was trying to run a simulation on my car team's model, my solution ratio was not converging at all.

On previous simulation runs, I've been able to successfully run sims that take about 30-60 minutes. However, this time my solution ratio and simulation wouldn't work after running the sim for 4+ hours.

For reference, I am using incompressible flow with a steady-state model of K-Omega. I've also attached the plot manager.
I would greatly appreciate any tips on running this simulation successfully. I also tried decreasing the volume meshing size from 0.75 to 0.25 but had no luck.

image.png

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Answers

  • Jagan Adithya Elango
    Jagan Adithya Elango Altair Community Member

    Oscillations in the steady state solution are inevitable if the flow being modeled is inherently unsteady.

    Let it run for 100 iterations and monitor surface outputs such as drag force or any other parameter of interest to determine how stable it is.

    Try modifying the flow stagger settings and setting the maximum linear iterations to 3000, as it might improve convergence.

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