In addition to the other comments, I just want to point out that we _do_ do a tremendous amount of CFD. The Pleiades supercomputer [0] sits in a building just down the street from the large wind tunnel at Ames Research Center, is generally ranked somewhere in the top 150 supercomputers in the world, and is largely used for CFD work to complement the wind tunnel work.

0: https://en.wikipedia.org/wiki/Pleiades_(supercomputer)