Summary of LLNL Russian Projects | |
Schilling, O | |
Lawrence Livermore National Laboratory | |
关键词: Lawrence Livermore National Laboratory; Approximations; Efficiency; 71 Classical And Quantumm Mechanics, General Physics; Algorithms; | |
DOI : 10.2172/902309 RP-ID : UCRL-TR-227384 RP-ID : W-7405-ENG-48 RP-ID : 902309 |
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美国|英语 | |
来源: UNT Digital Library | |
【 摘 要 】
The objective of this project is to develop and demonstrate more efficient methods for solving radiation transport equations using adaptivity in angle variables. Conventional angular discretization methods require that the angular finite-difference grid be fine enough in any region. If the grid is too coarse, the well-known ''ray effects'' appear. In addition, subdomains appear with a highly anisotropic particle flux distribution over directions (where a very fine angular difference grid must be used), as well as subdomains where the distribution is nearly isotropic. In view of this, a promising approach to multi-dimensional transport solution efficiency enhancement using finite-difference approximations is one employing adaptive grids. Such adaptive methods are expected to resolve the ''ray effect'' problem in a cost-efficient manner. The algorithm for solving the radiation transport equation using an angle-adaptive method with dynamic criteria for constructing the grid was evaluated using a set of benchmark test problems (pipe, slit, vacuum, and spherical).
【 预 览 】
Files | Size | Format | View |
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902309.pdf | 838KB | download |