Boundary condition for injection mold cooling process

[Nikvaid]

Hi,

I want to simulate injection mold cooling process in ANSYS CFX. My objectives are to find out temperature distribution on core surface and cycle time.

My question is how to give boundary condition to the core surface, which can represent periodic heat flux given in to the mold due to solidification of molten plastic during each cycle?

OR

Is there any other way to represent this periodic heat transfer process?