3D simulation of paraffin wax
 

I am simulating Paraffin wax (350*150*25 mm3). I have applied a temperature of 600K at the bottom wall and all other wall are adiabatic (Temp =0). I would like to know defined boundary conditions is correct or wrong. Because i can't see the melting of wax in the contours of liquid fraction.

I have used Pressure based solver, transient, energy equation, solidification/melting, piecewise for density calculation and PISO, PRESTO solution methods.

I have attached the image file of contours of liuquid fraction and static temperature. Please suggest me how to rectify the problem. Thanks in advance.