[FLASH-USERS] Orbit Test Problem crash during runtime

[Ryan Farber]

Hi FLASH-users,

I am trying to perform the "Orbit" test problem that comes with FLASH4.2.2
to test Poisson solvers in simulations including particles.

I used the following setup command:
./setup Orbit -auto -3d

It compiled fine but crashed during runtime. The message dumped to
stdout/stderr was:

DRIVER_ABORT: src == gr_meshMe, and we still have unmatched neData, bad

while the orbit.log file had:

 [ 11-07-2017  15:38:20.889 ] step: n=440 t=1.756000E+03 dt=2.000000E+00
 [ 11-07-2017  15:38:20.894 ] [DRIVER_ABORT]: Driver_abort() called by
PE           0
 [ 11-07-2017  15:38:20.895 ] abort_message: src == gr_meshMe, and we still
have unmatched neData, bad

I managed to fix the issue by setting the logical parameter "regrid" to
.false. in Particles_advance.F90 (as reminded by looking at a previous
FLASH-USERS email), but I am concerned if this is an acceptable workaround.

Shouldn't particles that move off the block owned by its source processor
need to have regrid=.true.? Would anyone be able to explain in more detail
the purpose of having regrid=.true. or regrid=.false.

Thanks in advance for your help.

Best,
--------
Ryan Farber
Graduate Student
University of Michigan, Ann Arbor

P.S. Thanks Klaus for responding to my last question! I greatly appreciate
the help!
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