Since 1978
Published in Sarov (Arzamas-16), Nizhegorodskaya oblast
RUSSIAN FEDERAL
NUCLEAR CENTER -
ALL-RUSSIAN RESEARCH INSTITUTE
OF EXPERIMENTAL PHYSICS
 
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Issue No 1, 2020


ACCURACY OF FEM SCHEMES FOR SOLVING THE TRANSPORT EQUATION ON UNSTRUCTURED TETRAHEDRAL AND PRISMATIC GRIDS

O. V. Nikolaeva, A. S. Kazantseva
VANT. Ser.: Mat. Mod. Fiz. Proc. 2020. No 1. P. 3-19.

The paper presents testing and analysis results for the grid schemes of the finite element method (FEM) used to solve the transport equation on unstructured grids with two types of cells: tetrahedrons and triangular prisms. The first-order differential approximation has been obtained for these schemes. The grid solution convergence has been numerically studied using a condensing spatial grid in the problem of interpenetrating radiation and in models of a thermal reactor and a fast reactor. Relative runtimes depending on the result accuracy degree are given.


Key words: transport equation, unstructured grids, tetrahedral grids, prismatic grids, the finite element method.
CALCULATION OF NEUTRONIC PARAMETERS FOR THE "FullCore" BENCHMARK USING THE TDMCC AND "SAPFIR_95&RC_VVER" CODES

S. N. Antonov, A. D. Rusakov, A. N. Ustinov, M. V. Fateev, M. V. Frolova, T. V. Semenova, N. A. Volkov
VANT. Ser.: Mat. Mod. Fiz. Proc. 2020. No 1. P. 20-33.

Verification results are presented for the SAPFIR_95&RC_VVER software complex used to calculate the neutronic parameters for VVER cores.
The "FullCore" benchmark was used for the verification. The geometric and material parameters of the Temelin NPP core form the basis for the input data used in the benchmark. The accuracy of simulations by mbox{SAPFIR\_95{&}RC\_VVER } was proved using the obtained results of Monte Carlo simulations by the TDMCC code. The TDMCC results were previously compared to the results obtained using the precision codes Serpent, MCNP, and MCU.


Key words: verification, neutronic parameters, core, benchmark, the Monte Carlo method, precision codes.
THE SPECIFICS OF THE TIME-OF-FLIGHT DETECTOR SIGNAL GENERATION IN MEASUREMENTS OF THE PLASMA FOCUS RADIATION IN A CLOSED SPACE

V. E. Ablesimov, O. Yu. Pasharina
VANT. Ser.: Mat. Mod. Fiz. Proc. 2020. No 1. P. 34-42.

The analysis of experimental measurement results was performed for the DD-neutron yield experiments with the Mather-type plasma focus chamber. Calculations of the signal generation were carried out for the experiment on recording the plasma focus radiation by scintillation detectors (SD) with the time-of-flight method under specific measurement conditions in the experimental hall. The measurement conditions are a 3D geometry of the medium surrounding the radiation source and detector and a noticeable contribution of the neutron- and gamma-radiation caused by the neutron-medium interaction to the signal recorded by the detector. The measurement experiment was simulated by the C-007 code using the Monte Carlo method.
It was demonstrated that the anisotropy of the neutron flux generated in the plasma focus chamber has a significant effect on the SD signal generation. The role of the contribution to the detector signal from radiation scatted in the environment was established.


Key words: plasma focus, neutron yield anisotropy, scintillation detectors, the time-of-flight method, the Monte Carlo method.
ATOMATIC GENERATOR OF UNSTRUCTURED TETRAHEDRAL GRIDS WITH PRISMATIC LAYERS IN THE LOGOS SOFTWARE PACKAGE PREPROCESSOR

N. V. Popova, O. N. Borisenko, I. I. Korneeva, N. V. Chukhmanov, E. V. Potekhina, V. V. Lazarev, A. G. Giniyatullina
VANT. Ser.: Mat. Mod. Fiz. Proc. 2020. No 1. P. 43-57.

The description of the automatic generator of unstructured tetrahedral isotropic grids with prismatic layers is given. The generator is used to construct grid models when solving the aero- and hydrodynamics problems with the LOGOS software package. The stages of generating a volume grid are considered. The specific features of the arbitrarily-shaped model geometry are taken into account in the grid generation.


Key words: LOGOS software package, preprocessor, unstructured grids, prismatic layer, Delaunay triangulation with limitations, moving front.
CAPABILITIES OF THE USER INTERFACE OF THE OptIMUS VISUALIZATION-AND-INTEGRATION PLATFORM WITH REGARD TO PROSPECTS FOR THE ARTIFICIAL INTELLIGENCE TECHNOLOGIES INTEGRATION

O. V. Kovalenko, I. A. Kryuchkov, A. V. Ogorodnikov, N. I. Khochkin
VANT. Ser.: Mat. Mod. Fiz. Proc. 2020. No 1. P. 58-65.

The paper describes the program architecture of the pre-postprocessor of the OptIMUS visualization-and-integration platform for the optimization simulation and management of systems on the base of multiagent technologies. The platform provides a scalable set of components for the development of program complexes supporting the decision-making processes, which are required in designing and improving characteristics of high-cost unmanned aircrafts, control systems, armaments, military and special-purpose equipment.
The artificial intelligence technologies are presented: a domain-specific programming language, ontological representation, navigation networks, metaheuristic optimization. The integration of these technologies in GUI of the OptIMUS visualization-and-integration platform would allow significantly extending the range of capabilities for the development and improvement of weapons, military and special-purpose equipment.


Key words: simulation, pre-postprocessor, artificial intelligence, intellectual agents, domain-specific language, ontology, navigation network, metaheuristic optimization, armaments, military and special-purpose equipment, user interface, visualization-and-integration platform OptIMUS.
TESTING PROCEDURE FOR THE LOGOS SOFTWARE PACKAGE

N. S. Averina, T. Yu. Bakanova, M. G. Lashmanova, E. A. Savinykh, T. N. Serova
VANT. Ser.: Mat. Mod. Fiz. Proc. 2020. No 1. P. 66-76.

The paper considers the problem of quality assurance for complex software products by the example of the LOGOS software package developed at FSUE “RFNC-VNIIEF”. The testing procedure developed and used to assure a high quality of the LOGOS software package, the types of test efforts for various LOGOS components, and frequency of testing are described. Also, the data used for testing are considered. The description of how to use tools to automate the execution of tests is given.


Key words: testing, LOGOS software package, test basis, procedure, types of test efforts, quality of software.
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