I'm new to Fluent and have run into a problem with mass-specified pressure boundaries that I can't seem to resolve. Specifically it seems that for the case that I am running, Fluent will run fine for first 50 iterations or so. After that the pressure in my domain suddenly explodes, with a high of around 14.5 million psi and a low at an equal negative number (one half the domain will be the high, the other half will be the low). Has anybody encountered such a problem before or have any idea why it's doing what it's doing?

Thanks, John

For this, in CFD, the solution is said to be diverging. You may like to reduce under-relaxation factors. Don't forget to check the case for appropriateness of models you've selected in case you're using Fluent 6.3.