On Oct 22, 2025, at 11:51, Rhiannon Silva SilvaRL@cardiff.ac.uk wrote:
Hi,
The GW150914 example parameter file uses 8th order finite differencing and I need a 6th order version for comparison in terms of both accuracy and speed. Apart from changing the finite differencing orders from 8 to 6, and I assume GlobalDerivative automatically selects the correct dissipation order since it's not specified, what would I use for the following values?
Driver::ghost_size = 5 Coordinates::patch_boundary_size = 5 Coordinates::additional_overlap_size = 3 Coordinates::outer_boundary_size = 5
You would set "ghost_size = 4" and "patch_boundary_size = 4" and "outer_boundary_size = 4". You might be able to reduce "additional_overlap_size" as well.
Carpet::prolongation_order_space = 5
It is up to you whether you reduce "prolongation_order_space". Probably not.
-erik
Is there anything else I missed that I should change?