Non positive volume after solver settings
 

Hi everyone,

I run a case without problem with first order densty, momentum,... about 1000 iterations.Before run the case, i also check grid and no problem arises.But when i change properties of density and momentum to second order, FLUENT gives a problem of "non positive volume exist". Moreover i face with this problem at a specific Mach number.:confused:

Thanks for your replys

P.S:FLUENT world is really strange!