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

RUSSIAN FEDERAL
NUCLEAR CENTER -
ALL-RUSSIAN RESEARCH INSTITUTE
OF EXPERIMENTAL PHYSICS
 
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METHODS FOR PARALLELIZING MULTIDIMENSIONAL PROBLEMS OF GAS DYNAMICS WITH HEAT CONDUCTION ON THE GRIDS OF MODULAR-MATRIX TYPE

B.L. Voronin, O.I. Butnev, A.N. Bykov, A.M.Erofeev,S.I.Skrypnik, I.D. Sofronov, D. Nilsen
VANT. Ser.: Mat. Mod. Fiz. Proc 2000. Вып.1. С. 3-7.

The paper describes parallelization methods used for developing parallel program implementing Eulerian-Lagrangian technique for numerical solution of 3D time-dependent problems of gas dynamics with heat conduction on the grids of modular-matrix type. Two fundamentally different approaches to arranging array-parallel computations were developed.

       Parallelization efficiency has been numerically studied for various methods of a problem geometrical decomposition, for two modes of processor load and depending on the relation between arithmetic and communication work.

       Parallelization efficiency of the parallel program developed is presented for different high-parallel computer systems.



TECHNIQUE FOR CALCULATING SPECTRAL RADIATION TRANSPORT IN 2D MIMOZA-ND COMPLEX

I.D. Sofronov, S.A. Bel'kov, O.A.Vinokurov, L.S. Mkhitar'yan, N.A. Ryabikina
VANT. Ser.: Mat. Mod. Fiz. Proc 2000. Вып.1. С. 8-15.

The paper deals with a technique for calculating spectral radiation transport in diffusion approximation in MIMOZA-ND program complex and an implementation of ionization kinetics equation calculation in mean ion approximation.

       2D calculations were performed for asymmetric targets, examined in experiments intended for irradiating X-rays targets on "Iskra-5" plant using the upgraded MIMOZA-ND complex capable of considering time-dependent non-equilibrium spectral transport of X-rays radiation. Computed data were compared with experimental results. It is demonstrated that computed neutron yields and neutron generation time agreed satisfactorily with experimental data.



PARALLELIZATION USE ON THE MULTIPROCESSOR MP-3 FOR ANALYSIS OF ZABABAKHIN SLOYKA

I.D. Sofronov, I.V. Demin, V.A.Novichikhin, L.N. Smirnova, A.A. Solonenkov, S.A. Kholin
VANT. Ser.: Mat. Mod. Fiz. Proc 2000. Вып.1. С. 8-15.

MIMOZA code was used for computing Zababakhin sloyka (layer cake type) in 16 pairs of heavy and light layers with aspect ratios 0.1 and 0.2 respectively with outer radius 10{cm} and central domain radius 0.0652{cm}. The computations were carried out with/without regard to heat conduction. Parallelization is essential with domain size difference by the factor of 1000. As the basis for paralellization algorithm the authors used a scheme, in which different computational domains were computed on separate processor elements, the values obtained at the previous time step were taken as at the next step. To shorten processors downtime computational domains are rearranged at the end of each step and the order of their computation is changed according to statistics, obtained at the previous step.



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