I don't think you can define scientific computing in a way that excludes quantum mechanics, molecular dynamics, fluid dynamics, Monte Carlo simulations... There

I don't think you can define scientific computing in a way that excludes quantum mechanics, molecular dynamics, fluid dynamics, Monte Carlo simulations... There are lots of long-running applications. We don't want them to be long-running, but it's not unusual for a run to take weeks and not unheard-of for it to take months.