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Anelastic cutoff issues in Urca sims #382

@biboyd

Description

@biboyd

There appears to be some sort of perturbation that arises at the anelastic_cutoff_density. This grows and starts to limit the timestepping if the interior convection is relatively slow. Example slices of the density perturbation and resulting velocity:
plt0000075_Slice_x_rhopert
plt0000075_Slice_x_magvel

The provided inputs and model file can replicate this for a 256^3
inputs_model.zip

I've tested this using pure MPI and MPI+OMP, with the same results.

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