[1911abh]

Hi everyone, I am solving a problem on "natural convection driven melting of phase change material". To solving it, I am choosing transient option. For density I have selected Boussinesq and entered the density of solid state of pcm there. Also from the help of fluent tutorial I have calculated thermal expansion coefficient and entered its value in the material properties section. My geometry is a 2D square and the boundary conditions are left wall at 321 K, right wall at 311 K and top and bottom wall are insulated. But when I am running the calculation then there is no natural convection effect occurring.

Does anybody know how to solve a problem like this?