There’s a lot of variance between codes that run on a HPC system like this. You’d expect to see molecular dynamics, fluid dynamics, weather forecasting codes, density functional theory etc. etc., and the first two especially have a lot of variance in the codes and methods used to do those simulations.

I can’t remember the figures off of the top of my head but I read a report those use cases dominated ARCHER (UK national supercomputer) compute time a few years ago.