[pnguyen]

Hi all,

I'm relatively new to CFD and OpenFoam, and am having problems with a case, so please bare with me. I am an undergrad student doing a project for my supervisor comparing openfoam with fluent.

I am setting up a conjugate heat transfer case inside an oven, with 3 solid regions inside the oven. 2 nozzles direct flow into the oven. The mesh is a fluent mesh that my supervisor gave me.

I have set up the case using the chtMultiRegionSimpleFoam tutorial (multiRegionHeater), changing the 0/ files to suit my problem. I have an inlet velocity of 19m/s with a temp of 478K and the outlet is at zeroGradient for both velocity and temperature, and held at a constant pressure of 1 bar. You can find attached my 0/ files for my fluid and solid regions.

When I run the simulation, it diverges after 130 iterations. The temperature field and density seems to start diverging once the solid heats up. The region where the lowest temperature is on the last iteration via paraview is attached.

Could someone please give me any ideas on what is going wrong with the simulation? Could it be a boundary condition set up, solver set up or mesh? Any replies will be greatly appreciated.

Sincerely,

Peter Nguyen