Re: [Users] Negative timesteps with timestep_method="courant_speed" and terminate="time"

Erik,

thanks for the reply.

On Thu, 2011-03-03 at 09:55 -0500, Erik Schnetter wrote:

Are you using mesh refinement in these simulations? Carpet's time stepping algorithm doesn't support changing the time step size. (It is fine if you use unigrid.) If you do, this may explain your symptoms, because the different time levels on the different refinement levels would become seriously inconsistent.

I am using Carpet, but with unigrid. The timestepping is done with MoL, RK3.

This issue disappears either by using a terminate condition based on the number of iterations or by applying that patch. (I checked that courant_wave_speed > 0).

David