Spartan SP_N Parallelization Strategies

• Strategy I: serial structure with spatial domain decomposition
• Strategy II: one diffusion solve per box (energy-angle parallelization), domain decomposition within a box
• Strategy III: serial structure, spatial domain decomposition, local on-box Krylov preconditioner
• Other Strategies:
  • Newton-Krylov instead of source iteration
  • DSA/LMFG preconditioning
  • coarse processor-level multigrid