Is there a way to define the size of the computational domain in an external study by using model surfaces?  I'd like to have the computational domain resize when the model rebuilds, but I don't like the default size that Flow Simulation generates.  Is there a setting that defines the default +/- X,Y,Z offsets from the model?  I'm simulating airflow over and through a building located on the ground, so I would like to be able to force the minimum Z to equal zero.

Also, is it possible to define ambient wind speed simply using compass direction and velocity?  Changing Vx and Vy every time is a bit cumbersome.