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August 22, 2007, 15:46 |
Converged?
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#1 |
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This might be a moot point, but I ran a simulation overnight with the double precision solver, and I'm seeing something strange (at least to me) in the residual plots.
For reference, I'm modeling a turbulent multiphase shear flow with total energy heat transfer between two fluid layers. And I set the convergence criteria to E-5. All of the momentum, heat transfer, and turbulence residuals have dropped below E-7 RMS. The momentum imbalance(%) is below 4e-005, and the mass fraction imbalance(%) is below 0.3. The strange thing though, is that one of the RMS Mass fraction residuals is oscillating between E-4 and E-5, but never drops below E-5 (Hence why the solver didn't reach convergence and stop). But, the mass fraction residual of the other phase is below E-7. What I'm wondering is whether I should just accept this as a good result, or if I should revisit my mesh, and try to refine it. It just seems strange that all the other residuals would converge except that one. |
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