[FLASH-USERS] Flash Users: usm solver with non cubic block size in Uniform Grid

[Gandhari Wattal]

Hi

I am using the Flash4.2.2 code to run a MHD simulation. When I run this 
simulation with Uniform Grid and a non cubic block size the code crashes 
with the error "DRIVER_ABORT: [Hydro]: Computed dt is not positive! 
Aborting!".

When I run the same code with a cubic block size in a uniform Grid, it 
works fine.

I also tried the sample MHD test setup  BrioWu with the usm solver. 
Again the BrioWu code would crash with the non cubic block and run fine 
with a cubic block. When I ran the BrioWu with the 8 wave solver it ran 
fine with the non cubic block size.

I also ran the hydro test setup Sod. The Sod setup runs fine with a non 
cubic grid.

So this leads me to believe that there is some problem with the usm 
solver in the non cubic block size uniform grid implementation.

Any help or suggestions in this regard will be highly appreciated.

Thanks
Gandhari

-- 
Gandhari Wattal
Doctoral student
Department of Physics
University of Wisconsin-Madison