Scientific computing is a large group of users who do applied mathematics, numerical linear algebra, numerical differential equations, mathematical modeling, etc. One of the first questions on the discourse site was on FEM discretization of PDEs. With how tailor made Julia is to scientific computing, it should probably have its own domain.
While some may not like the name, it’s always been named either this or Computational Science, see anything you count as a reference. The StackOverflow for this group is named Computational Science but is prefixed with “scicomp” for scientific computing. It’s pretty much agreed on what “Scientific Computing” means.