All of the stuff at Ames that ran on the Cray, was written in HPE Fortran, because the compiler has the ability to vectorize it, and yes, a lot of those fluid simulations that are in their final form for airfoil design do get validated in wind tunnels.

I would love to see some fluid dynamic work run in a web browser, but ... You need the WebAssembly to be able to vectorize and optimize it: See Airvisual.com

or

https://paveldogreat.github.io/WebGL-Fluid-Simulation/