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Convergence plot
Posted 16 août 2023, 02:41 UTC−4 1 Reply
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When using a non-linear time dependent solver, convergence plot shows reciprocal of step size vs time step graph.How can I interpret that the solution is approaching convergence?
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Like you said, the "convergence" plot is simply showing the reciprocal of the time step size. Depending on your solver settings and the nature of your problem, this may or may not change from one time step to another. In configurations where the time step size is allowed to vary (which is the usual default), if you observe a tendency toward endlessly decreasing step sizes vs. time, then this generally implies the existence of undesirable numerical issues. If you look at the solution log, you can learn more about the seriousness of the errors that are causing the time-stepper to attempt to use shorter time steps (to address its difficulties). Modifying your geometry, mesh, solver settings, boundary and/or initial conditions, discretization, etc., can all impact success (or failure) of time-domain models to complete the calculations. Always prepare and solve simple problems first -- then work your way toward the more complicated problems of interest to you.
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