Unexplained floating point exception

[Jmseele]

I am running a fluent simulation and get the message: 

iter continuity x-velocity y-velocity z-velocity energy time/iter

Stabilizing temperature to enhance linear solver robustness.

Stabilizing temperature using GMRES to enhance linear solver robustness.

Divergence detected in AMG solver: temperature

Error at host: floating point exception

===============Message from the Cortex Process================================

Compute processes interrupted. Processing can be resumed.

==============================================================================

Error at Node 0: floating point exception

Error: floating point exception

Error Object: #f

 

My mesh orthogonal quality is good and I can not find anything specific about the cause of error when running a mesh check. Can anybody help?

[Rob]

What models, materials and boundary conditions are you using? 

[Jmseele]

I am using laminar flow and energy model. My BCs are inlet velocity and pressure outlet with reverse flow prevented. Using propylene glycol/water mixture for fluid zones and copper aluminum steel for solid zones. I also have a heat generation source

[Rob]

OK, and what sort of temperatures are you expecting? The energy equation looks to have failed first, so start with the source term. What is the fluid density modelled as? Has it run any iterations or has the solver failed on the first iteration?

[Jmseele]

I'm expecting temperatures from 11-40 deg C. fluid density is constant 1085 kg/m^3. Fails on the first iteration.

[Rob]

OK. Turn off the source term and run 10 iterations. How does the flow look? Save case & data. Turn on the source term, run 10 iterations.