There are fewer aerospace engineering graduates because they’re not in as much demand as computer people. How many people do you really need designing aircraft and rockets? Aerospace companies require more programmers than aerospace engineers.
The computational engineering program at Texas looks like the computational math programs I see at other schools. Actually, if I had it to do all over again, I’d have gone for something like computational engineering or computational math rather than CS. A few years ago at a local university, I took a class that was basically a survey of computational math applications, and it was fascinating.