External Aero-boundary condition.
 

Dear All,

I have a question regarding boundary condition setup for external aero problems.

I have a car model with tyres of a certain radius. The car is supposed to be travelling at 20m/sec.

My questions are:

1. Do I define the moving ground as Relative or Absolute? 2. Velocity inlet is 20m/sec, relative or absolute. 3. Spinning tyre X rads/sec, relative or absolute.

Many thanks in advance.