Since 1978
Published in Sarov (Arzamas-16), Nizhegorodskaya oblast

RUSSIAN FEDERAL
NUCLEAR CENTER -
ALL-RUSSIAN RESEARCH INSTITUTE
OF EXPERIMENTAL PHYSICS
 
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NUMERICAL STUDY OF THE X-RAY TRANSPORT IN VACUUM CAVITY

V. V. Vatulin, K. A. Volkova, A. A. Kibkalo, P. I. Pevnaya, N. P. Pleteneva, R. M. Shagaliev
VANT. Ser.: Mat. Mod. Fiz. Proc 2020. Вып.2. С. 33-44.

The problem of X-ray transport in vacuum cavity of a target has been solved using techniques based on different physical models and mathematical methods: "vacuum" approximation with the use of angular visibility factors, diffusion approximation, multigroup kinetic approximation, and the Monte Carlo method.

Keywords: transport of X-rays, visibility factors, vacuum approximation, multigroup kinetic approximation, the Monte Carlo method, diffusion approximation.

METHODOLOGICAL APPLICATION TESTS DEVELOPED AT RFNC-VNIIEF FOR NUMERICALLY STUDYING PARAMETERS OF HPC SYSTEMS

A. V. Alekseev, S. P. Belyaev, A. I. Bochkov, A. N. Bykov, M. V. Vetchinnikov, A. N. Zalyalov, A. A. Nuzhdin, S. P. Ognev, N. S. Samsonova, I. S. Sapronov, I. N. Chistyakova, T. V. Shemyakina, R. M. Shagaliev, Yu. V. Yanilkin
VANT. Ser.: Mat. Mod. Fiz. Proc 2020. Вып.2. С. 86-100.

The paper considers the issues of testing high-performance computing systems for the numerical simulation of complex physical processes. Methodological application tests (miniapps) developed at RFNC- VNIIEF are reviewed. A test package includes codes for the simulation of various physical processes: neutron transport simulations using difference methods (in kinetic and diffusion approximation) and the Monte Carlo method, gas dynamics, heat transfer, and molecular dynamics processes. These test codes are used to assess the efficiency of paralleling, real performance, and correctness of simulations by high-performance computing systems. The general functionality of test codes, as well as the specific features of algorithms and testing procedures for each code are considered.

Keywords: high-performance computing systems, numerical simulation of physical processes, a test program, miniapps, efficiency of paralleling, performance.








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