R is actually the basis of one of the CORAL2 benchmark sets, and there are published scaling results to 5000 cores as far as I remember. I've not done it, but p

R is actually the basis of one of the CORAL2 benchmark sets, and there are published scaling results to 5000 cores as far as I remember. I've not done it, but presumably you can substitute its BLAS with a GPU version, the same as with an OpenMP-parallelized one to get performance for anything linear algebra-ish. [HPC clusters on which you'd run CFD typically don't let you run for more than days, let alone months. There's probably no reason you couldn't use R the same way as Python for such things.]