[FLASH-USERS] split solver, timestepping/refinement and the time accuracy order

[Andrea Gatto]

Dear all,

for stability reasons I find myself forced to reduce the timestep after
the first call (in the first half of the Strang splitting loop) of the
source terms when using a split solver in Driver_evolveFlash.F90 .
This means that the second call of the solver (in the second half of the
loop) is performed on a different (smaller) timestep.
Could this cause the Strang splitting scheme accuracy order to be reduced
from 2 to 1? Are there any other problems with this timestep change?
Could this problem happen also when I force a refinement in a certain
region during the first call of the source terms?

Many thanks.

Best,

Andrea