Hi Michael, On 06/03/2020 07:00, Michael Laufer wrote: > I am trying to recreate the computations from Park > <https://arc.aiaa.org/doi/10.2514/1.J055304> (2017) and Witherden > <https://arc.aiaa.org/doi/10.2514/1.J058434> (2020) on a NACA 0021 > airfoil in deep stall. > I run into an issue almost immediately during the low-order (P1) start > up phase without anti-aliasing, where I get a divergence error > ("RuntimeError: Minimum sized time step rejected") > I have also tried running with a lower Re=27K and only after afterwards > changing to the nominal Re=270K like explained in Park, but it still > diverges once the Reynolds number is increased. > In addition, I have tried both Riemann-solver types (roem and rusanov) > that were used in both papers, but no difference was seen. > Lastly, I am seeing this phenomenon with both the P3 and P4 meshes > provided in Park.
My start-up procedure was to run at p = 1 and Re = 27k with no anti-aliasing until t = 100. Then, restart with the 'main' .ini file (final p, correct Re, anti-aliasing/filtering as required). Regards, Freddie. -- You received this message because you are subscribed to the Google Groups "PyFR Mailing List" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/pyfrmailinglist/33714d61-5126-9b1b-87e7-ae3c49f6a08a%40witherden.org.
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