Does anyone have any insight as to how much modern simulation software helps the process? From what little I remember of reading about the first attempts at su

Does anyone have any insight as to how much modern simulation software helps the process? From what little I remember of reading about the first attempts at supersonic flight, there were a lot of unknowns and somewhat counter-intuitive factors, and it was being calculated on slide rules. Can modern engineering and simulation software reasonably predict the effects of supersonic flight on a model?