When I took CFD (Computational Fluid Dynamics) in grad school Fall 2020 we used ANSYS Fluent. That's one of the big programs for simulating liquid, gas and heat flow. I wanted to do a 2D simulation of airflow over my Duster but couldn't find a model online and didn't feel like making one lol. For one assignment we had to simulate turbulent airflow over a passenger airliner, very cool stuff. These modern programs are extremely powerful.
SolidWorks is currently the most popular 3D modeling software for making parts and assemblies. Like AutoCAD but much better lol. I use it at work from time to time.
