Reply To: NIMBY FUD

[asymmetric_implosion]

BSFusion wrote: Multiphysics

In what context? How do you go from using a fluid assumption to a kinetic description when you have to track extra variables you didn’t track before? You have to make assumptions on the transition. Depending on the problem the assumptions are reasonable. The plasma focus does not lend itself to a nice transition. I know a group at Livermore is working on a pure kinetic simulation and it takes days of computational time on something like 100 processors and they model only the last 100 ns of the implosion. Fluid-kinetic hybrids have yet to demonstrate agreement with experimental data. MHD models have generally been better when everyone knows they don’t work. Another group in the UK is working the problem on the plasma focus. I’m not familiar with Dr. Dumas, but the Imperial College group has a solid computational base and a 3D MHD code as a starting point.