Hi All,
I've been playing around with the GW150914 par file and have been trying
to set up a pure Cartesian AMR run with the exact same grid setup in the
Cartesian region.
I noticed that
Coordinates::additional_overlap_size = 3
(that appears to be required) not just increases the size of the
cubed-sphere patches, but also of all patches in the Cartesian region,
including refined regions. Is this a feature (if so, why?) or a bug?
Hi Christian,
I have never noticed this; I hope it's not happening, as it would be very strange! If it is happening, it definitely sounds like a bug. I'm fairly sure I have checked the refined regions in the past when using Llama, and they were the expected sizes. So if this is happening now, it is likely a change (probably to Carpet) that has happened relatively recently (the past year or two).
Can you post the parameter files and carpet-grid.asc files for the two runs which differ only in additional_overlap_size?
Is it possible that by increasing additional_overlap_size, the coarsest Cartesian grid RL0 is being moved inwards too close to the buffer zones of RL1, and RL1 is being extended to cover RL0 as a result? This would result in RL1 appearing to increase in size, but it shouldn't affect the finer levels. Do you see the finer levels also change?