I am using VOF(3 phases liquid nitrogen, water, air) along with solidification and melting model, keeping k-epsilon for turbulence, but since the velocity at inlet is 70 m/s ,so I have to choose very low time step(0.0000001) in order to satisfy the courant number. Refining mesh increase the computation time. Selecting implicit scheme (in VOF) is not giving the proper result.
SUGGEST ANY REMEDY TO DECREASE THE COMPUTATION TIME.
WHY CAN'T WE USE IMPLICIT WITH VOF?