[dvcauwe]

Hello,

I am currently working on my Master's Thesis and I'm trying to simulate turbulent air flow through finned tubes. For this I would like to use the Reynolds Stress Model with QUICK discretization scheme for all equations.

Unfortunately, whether I initialize from a fully converged ke-RNG (all QUICK) solution, or start from a fully converged RSM (all QUICK, except for 1st order upwind reynolds stresses), I can't achieve convergence.

For about 50 iterations, all appears normal, but then suddenly in 1 iteration, the temperature leaps out of bounds and all is lost.

I have also tried 2nd order upwind schemes and lowering the energy URF but nothing seems to work.

Thank you very much in advance for any advice you could give me!