Hello I am trying to model the heat transfer for a vehicle with outside air through vehicle walls. I have my mesh inside the vehicle. I have two questions here:

1) If at all I want to implement insulation to my vehicle ceiling, should I implement shell conduction for wall thermal boundary condition and add a second layer with insulation material.

2) Since my mesh is inside the vehicle, if I have to consider the moving effect of my vehicle, how to implement flow of air at a certain temperature and velocity over my vehicle walls. Is it necessary or free stream temperature will take care of it?

 Thank you