[aerohead]

There's much we'd need to know.
* The Space Shuttle was a MACH-8, un-powered glider. Automobiles are subsonic.
* It only spent a very limited time in the atmosphere.
* It entered the upper atmosphere at 18,000-mph.
* Transitioning down to a couple hundred mph upon touch down.
* It operated in an unbounded flow domain, unlike an automobile which is severely constrained by the ground plane.
* It was essentially an all-vortex-generator, delta-wing lifting device. Vortex-drag on an automobile is of the highest form of drag. Designers would do all they could to prevent its formation.
--------------------------------------------------------------------------------------
If Fluid X3D is an aeronautical CFD software package, it may be of zero use to us.
There may be requirements for the data cloud which precede the use of the program.
We might need a mini-supercomputer to run it.
Automotive requirements include 3D flow, which in implied in the software's title.
Viscous flow is a requirement.
Theoretically, it would require solving the Full Navier-Stokes Equation, which is for supercomputers, not desk-tops. 130-parallel desk-tops, yes!

We'd need the help of a qualified modeler.