Resolving Rapid Variation in Energy for Particle Transport

Haut, Terry Scot¹  Ahrens, Cory Douglas¹  Jonko, Alexandra¹  Till, Andrew Thomas¹  Lowrie, Robert Byron¹ 

[1] Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Computer, Computational, and Statistical Sciences Division

关键词: neutron transport;    thermal radiation transfer;    multigroup;    multiband;    homogenization;   

DOI  :  10.2172/1304798
RP-ID  :  LA-UR--16-26450
PID  :  OSTI ID: 1304798

美国|英语

来源: SciTech Connect

【 摘 要 】

Resolving the rapid variation in energy in neutron and thermal radiation transport is needed for the predictive simulation capability in high-energy density physics applications. Energy variation is difficult to resolve due to rapid variations in cross sections and opacities caused by quantized energy levels in the nuclei and electron clouds. In recent work, we have developed a new technique to simultaneously capture slow and rapid variations in the opacities and the solution using homogenization theory, which is similar to multiband (MB) and to the finite-element with discontiguous support (FEDS) method, but does not require closure information. We demonstrated the accuracy and efficiency of the method for a variety of problems. We are researching how to extend the method to problems with multiple materials and the same material but with different temperatures and densities. In this highlight, we briefly describe homogenization theory and some results.