Issue N^{o} 4, 1988 
ADAPTIVE DIFFERENCE METHODS FOR COMRUTER SIMULATION OF TIMEDEPENDENT GAS DYNAMICS FLOWS (REVIEW)
A. V. Zabrodin, I. D. Sofronow, N. N. Cheatsov VANT. Ser. Metodiki i Programmy Chislennogo Resheniya Zadach Matematicheskoy Fiziki. 1988. No 4. P. 322.
We examine difference methods for computing time dependent gas dynamics flows described by generalized solutions of differential equations in gas dynamics. Potential ways for increasing computer simulation method efficiencies are analyzed and their implementation is traced historically. Adaptive dtfference methods are proved to be more promising compared to homogeneous schemes for describing flows in gas dynamics. It is pointed out that creating special purpose computer networks is reasonable for solving a large number of 3D time  dependent problems.

SHOCK AND RAREFACTION WAVES IN A HETEROGENEOUS MIXTURE OF TWO CONDENSED MATERIALS O. V. Buriakov, V. F. Kuropatenko, V. K. Mustafin VANT. Ser. Metodiki i Programmy Chislennogo Resheniya Zadach Matematicheskoy Fiziki. 1988. No 4. P. 2329.
An exact solution is derived for a piston moving in a heterogeneous mixture of two condensed materials based on local component pressure equalibrium hypothesis. Component force interaction rate was represented as "joint masses" to use It for describing 119 pulse exchanges in the equation of motion. For a shock wave, the solution has a form of two large discontinuities, moving with different veloeities. Partial densities and velouties of both components experience a jump on each discontinuity. We found that the solution may have three types of structure depending on piston velocity and force interation rate.

ON MONOTONICITY OF AN IMPLICIT DIFFERENCE SCHEME A. N. Razin VANT. Ser. Metodiki i Programmy Chislennogo Resheniya Zadach Matematicheskoy Fiziki. 1988. No 4. P. 3037.
The paper examines the calculation of a supersonic flow field near bodies with negative and positive curvatures of the generating line. The computational algorithm is based on an implicit difference scheme proposed by Babenko and Voskresensky. Conditions are obtained to make the solution monotonous in the region of centered rarefaction wave. Computational results are given.

A SCHEME FOR A CONSISTENT APPROXIMATION OF CONVECTIVE FLOWS IN THE LEGAK PROCEDURE S. M. Bakhrakh, V. F. Spiridonov VANT. Ser. Metodiki i Programmy Chislennogo Resheniya Zadach Matematicheskoy Fiziki. 1988. No 4. P. 3843.
We consider some issues related to convective pulse flow approximations in a difference scheme of the LEGAK procedure designed for computing 2D gas dynamics flows in a nonhomogeneous medium using a concentration method and Lagrangian  Eulerian variables. A two  layer scheme is described to implement convective pulse mass approximation. The scheme conservatism is analyzed. A higher accuracy obtained with a new scheme is illustrated by solving a number of 1D problems.

INTERCELL EXCHANGES IN DMETALS A. I. Voropinov VANT. Ser. Metodiki i Programmy Chislennogo Resheniya Zadach Matematicheskoy Fiziki. 1988. No 4. P. 4449.
Eguationsofstate for metals are examined using the HartreeFock approximation. Our investigation relies upon accounting intercell exchanges of delectrons. An equation of state is solved for copper and vanadium. In addition, "theoretical" normal densities are calculated for 4 dmetals (niobium, ruthenium, and silver). Theoretical results are compared with experiment.

DATA MANAGEMENT IN A PROGRAM SUPPORT SYSTEM A. S. Kisel VANT. Ser. Metodiki i Programmy Chislennogo Resheniya Zadach Matematicheskoy Fiziki. 1988. No 4. P. 5054.
The paper describes some issues involved in implementing a program support system on the BESM6 computer and related to holding the source text of a program under development, service data and data access. The features include implementing library and key files and using the main memory in a dynamic/virtual mode. A FORTRAN component is described which provides a dynamic/virtual access to the main memory.

CONSTRUCTING A DATA TRANSFER NETWORK BASED ON SM COMPUTERS G. E. Potapov, S. I. Predeikin, Yu. I. Samsonov, I. D. Sofronov, E. P. Troitsky, V. A. Tsukanov, E. L. Shnepov VANT. Ser. Metodiki i Programmy Chislennogo Resheniya Zadach Matematicheskoy Fiziki. 1988. No 4. P. 5560.
We present the communication network architecture, hardware and software used. The network is a distributed switch composed of SM3 minicomputers to interconnect the network terminals with hosts in a central computer facility.

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