Research and Development in the Jayenne Implicit Monte Carlo Project

Todd J. Urbatsch, Allan B. Wollaber, Kelly G. Thompson, Jeffery D. Densmore, Gabriel M. Rockefeller, CCS-2; Timothy M. Kelley, CCS-7 The Jayenne Project, which began in 1997, provides simulation capability for thermal radiative transfer in the X-ray regime for high-energy-density physics applications such as supernova explosions, inertial confinement fusion, and radiation flow experiments at facilities such as SNL’s Z-Pinch, the Omega Facility, and the National Ignition Facility [1]. The Jayenne Project uses the Fleck and Cummings [2] Implicit Monte Carlo (IMC) method to simulate the transport of thermal radiation that is non-linearly and tightly coupled to hot material. The Jayenne Project’s software is multi-dimensional, runs on Adaptive Mesh Refinement (AMR) meshes, has different parallel schemes, and provides continuously improving production-level simulation while serving as a vehicle for methods research. Some of the recent research items include more accurate sub-cell representation of emission locations, adaptive implicitness, efficiency improvements (both methodsand architecture-based), and variance reduction.