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Since 1978
Published in Sarov (Arzamas-16), Nizhegorodskaya oblast |
RUSSIAN FEDERAL
NUCLEAR CENTER -
ALL-RUSSIAN RESEARCH INSTITUTE
OF EXPERIMENTAL PHYSICS |
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 Русский |  English
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TECHNIQUE FOR NEUTRON SCATTERING ANISOTROPY MODELING IN Pn-APPROXIMATION
A. N. Ivanov, N. V. Ivanov
VANT. Ser.: Mat. Mod. Fiz. Proc 2014. Вып.2. С. 3-13.
In the multi-group approximation the neutron scattering anisotropy is described by the coefficients of expansion into Legendre polynomials. At numerical problem solving the low order expansions of three or five terms are usually employed. The scattering angle cosine distribution density, retrieved from such expansions, can have negative values, which makes impossible solving the transport problems with the Monte-Carlo method in the same setting with difference methods. To avoid this, the initial density is replaced by the equivalent discrete density. The equivalency is understood as the agreement of the density moments. To smoothen the radial effect, the combination of triangular densities preserving the first two initial density moments is added to the discrete density.Keywords: Monte-Carlo method, neutron transport, scattering anisotropy, multi-group approximation.
| LOGOS-PREPOST PREPOSTPROCESSOR. BUSINESS-LOGICS LEVEL ARCHITECTURE, DATA STORAGE, IMPORT AND EXPORT
A. A. Anishchenko, V. I. Deryugin, V. N. Dyupin, K. V. Ivanov, A. S. Santalov, E. E. Santalova
VANT. Ser.: Mat. Mod. Fiz. Proc 2014. Вып.2. С. 78-82.
The paper describes the business-logics level architecture of the LOGOS-Prepost program application which is a component of the LOGOS simulation program complex. The paper describes the business-logics level interaction with the representation and data levels; the issues of data storage, import and export are tackled upon. The solutions which make the application flexible, adjustable and easily upgradable are indicated.Keywords: prepostprocessor, LOGOS, architecture, business-logics, data import, data export.
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