Advection Tests and Tracers SIGABRT with `ref_ratio = 4 4 4 4`

[etpalmer63]

For both the tests, Advection_AmrCore and Advection_AmrLevel, a segfault occurs when ref_ratio = 4 4 4 4 and tracers are turned on. This happens for both 2D and 3D runs.

The error msg given is:

amrex::Abort::1::ParticleContainer::locateParticle(): invalid particle. !!!
SIGABRT

[etpalmer63]

Tracked the issue a bit more: Error only occurs when subcycling is turned on.

[WeiqunZhang]

Not enough ghost cells? Advection_AmrCore/Source/AmrCoreAdv.H: int nghost = 2; Need 4 if ref_ratio is 4 && tracer particle is on && subcycling is on?