Hi

I am trying to simulate the airflow/ventilation out of a cricket helmet when worn by a player. I have modelled a basic head and a helmet, but i am unsure what wizard settings and boundary conditions to configure heat from a users head escaping through the helmet, and the best plot to visualise this.I have attached some pictures of the assembly. 

It does not need to be very accurate, just a visualisation of air escaping out of the ventilation slots in the helmet.  

Would really appreciate any help

Thank you