PCM Heat Exchanger Melting Simulation

I am looking for a complete numerical model that captures how quickly the phase-change material (PCM) inside a latent-heat storage unit melts and solidifies when heat-transfer fluid flows through several parallel tubes... (Budget: ₹12500 - ₹37500 INR, Jobs: Computational Fluid Dynamics, Finite Element Analysis, Fortran, LabVIEW, Matlab and Mathematica, Python, Simulation, Thermal Analysis)