[FLASH-USERS] restart PM run in UG mode

[Tomasz Plewa]

The simplest way of eliminating most of the AMR overhead is to set
lrefine_min=lrefine_max upon restart, dump a checkpoint after the first
mesh refinement, and restart again but now with nrefs=0.

It will not be as fast as real UG, but estimating possible gains is not
straightforward. If I remember correctly and for simple hydro, the above
approach offers gains provided the filling factor exceeds about 0.3.

Tomek
--
On 3/29/2010 7:49 PM, Alexander Wagner wrote:
> Dear FLASH developers/users,
>
> Just a quick question, as I can't find the answer in the manual or
> mailing list archive;
>
> Is it possible to restart an AMR simulation in UG mode with a
> checkpoint file created in PM mode? Or does it involve starting a new
> run and reading in the initial conditions from the checkpoint file
> manually.
>
> I can imagine this being a scenario commonly required when the flow in
> a simulation (especially in 3D) becomes more complex and fills larger
> portions of the domain; at some point most of the domain is maximally
> refined and the overhead in AMR exceeds the advantages of using AMR.
>
> Many thanks,
> Alex
>
>