[FLASH-USERS] Error in AMR Prolong Routine

[James Guillochon]

Hi guys,

I am running a simulation in FLASH 3.0 using multiple species, and  
after about 5000 time steps, I run into the following error:

[amr_prolong_gen_unk1_fun] PE=      7, ivar= 13, value= 24.0
Trying to convert non-zero mass-specific variable to per-volume form  
in monotonic mesh interpolation, but dens is zero!

The ivar = 13 being referred to here is the first species in my  
species list defined in Flash.h, which at the time of the abort is  
equal to smallx everywhere. It appears from the code that the recv  
variable array must have a zero value for density in at least one grid  
cell, but as far as I'm aware the density variable should never drop  
below smallrho!

Tracking the origin of this issue could take a very long time, so I  
was hoping someone here has encountered this issue before and knows of  
a remedy? Is there anywhere in FLASH where the density is set  
explicitly to zero?

Thanks!

-- 
James Guillochon
Department of Astronomy & Astrophysics
University of California, Santa Cruz
jfg at ucolick.org

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