Reply To: Strange Divergence in natural circulation simulation simulation using VOF

[Dato]

Sorry that I'm not exactly understand what "modelling the vapour density" means. Initially, It fills with water and constant wall temperature is applied. I heard Rayleigh number should be evaluated but I ignore it and k-epsilon model is applied. 

Dimension of calculation domian is shown below. Boundary layer cells are considered. 

I have another question:  when using Multiphase models like VOF or RPI model, whether near-wall mesh should be placed in turbulence fully developed region, while  I always have Y+=1 in single phase flow to use visous sublayer resolved method.