Good question! This does seem like an embarrassingly parallel problem. Whenever I've used the big HPC centers, the secret sauce has been a fast low latency netw

Good question! This does seem like an embarrassingly parallel problem. Whenever I've used the big HPC centers, the secret sauce has been a fast low latency network interconnect. The fast interconnect is useful for PDE solvers which need a lot of processor-to-processor communication (i.e. for sending data back/forth periodically along the boundaries of the grid cells you're solving for).