I can say, with some exposure to the issue through my own work, that as time passes CFD modeling, mostly in the form of numerical differential equations played

I can say, with some exposure to the issue through my own work, that as time passes CFD modeling, mostly in the form of numerical differential equations played out in a supercomputer simulation, is rapidly replacing physical models, partly because computer modeling is becoming less expensive, and partly because one can try more design variations in a shorter time than one can with real models.