Hi, everyone. I just tested the dual time stepping for euler vortex case in the examples using following *.ini configuration:
[solver-time-integrator] formulation = dual scheme = bdf2 pseudo-scheme = tvd-rk3 tstart = 0.0 tend = 100.0 dt = 1 pseudo-dt = 0.01 controller = none pseudo-niters-max = 20 pseudo-niters-min = 5 pseudo-aresid = 1e-5 pseudo-rresid = 1e-5 It is really fast (4s) comparing with standard time integrator (39s). 100.00/100.00 ela: 00:00:04 rem: 00:00:00 However, the result is different from default setting. The vortex goes lower in the dual-time stepping case. dual: <https://lh3.googleusercontent.com/-GXzvC5V4K6c/WIdrpyT6amI/AAAAAAAAFu8/8dQSDiN4E4YQFPtucrVm8J6OqPne_UQcwCLcB/s1600/dual.png> std: <https://lh3.googleusercontent.com/-lgNIR1Ly9uU/WIdrNLuC0sI/AAAAAAAAFu4/maBfcsazhS08NsErlyoZwd6Qj7RpkGx_ACLcB/s1600/std.png> I also tried to use pseudo-dt = 0.05 and 0.1 but it resulted in NaN error. My question is: a. What is wrong with this euler-vortex case using dual time stepping? b. What can I expect from using dual-stepping? -- 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 post to this group, send an email to [email protected]. Visit this group at https://groups.google.com/group/pyfrmailinglist. For more options, visit https://groups.google.com/d/optout.
