Verification and Validation Testing of the FLEXO Extended-MHD Code*

FLEXO (Flux-Limited Extended-MHD Ohm’s Law) is a production-line extended- magnetohydrodynamics (MHD) code being developed at Sandia National Laboratories for modeling high-energy-density (HED) plasma in a pulsed-power device, primarily with applications to the study of inertial confinement fusion (ICF).  We present recent results from verification and validation testing of various modeling capabilities in FLEXO, including hydrodynamics, MHD, extended-MHD, multi-material modeling, and adaptive mesh refinement.  These include the acceleration of a flyer plate, for which flyer velocities are compared against experimentally-measured values, several tests of Hall physics, and a number of tests for which a multi-material result with two identical materials is compared against a single-material result.

SAND2024-07896A