On Sat, 29 Apr 2017, Rossi, Simone wrote:
If I understand you correctly, performing more than one AMR step at
every timestep is “inefficient”. The strategy should be to run with
a fixed locally refined mesh for N timestep, before running a new
adaptive step.
Yes, although N=1 is often reasonable IMHO, if you're time stepping
aggressively enough.
Alternatively, could a possible strategy be to estimate the error at
every time step, and take the adaptive step only if the error is
larger than a given tolerance?
Hmm... I've never tried that, but it does sound like a good idea.
Another strategy I've seen in a paper was to use the same grid for
every time step of a transient calculation, but to determine *that*
grid adaptively, in a loop outside the transient loop. You then don't
need to compute the error indicator on your finest grind and you don't
need to compute projections ever. That was for a turbulent flow
problem, though; IIRC Boyce told me you had moving fronts, for which
that hack would be very suboptimal.
---
Roy
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