convergence problem

limseokmin

Hi every one. I'm facing with serious problem that problem dosen't converge. If somebody help me, greatly appreciated.

Problem description)

Large tank with small inlet & ourlet, contain wall which has heat flux to inner fluid. The fluid is liquid nitrogen. It's the cryostat.

My solving approach)

Use turbulent model(k-e model) - if do not use, the temperature near hear flux wall is much high. not phisical. Use varying properties(k, rho, C etc.) - polynomial interpolation (4th order). It's steady. It include enegy equation. Use default setting(relaxation factor, descretization scheme)

The difficulty is hard to obtain convergence. Especially the continuity convergence condition is main cause.

How do I can improve my problem solving conditions and reach the complete convergence. Please help me to follow up.