VNIIEF CODES AND METHODS FOR THE CALCULATION OF 2D AND 3D NONSTATIONARY RADIANT ENERGY TRANSFER IN COMPLEX SHAPE REGIONS USING THE VISIBILITY COEFFICIENTS. CONVERSION APPLICATIONS PROBLEMS
Ju. N. Babaev, S. V. Bazhenov, A. A. Bazin, E. G. Vasina, V. V. Gorev, Yu. A. Dementiev, V. G. Zagrafov, E. A. Karpovtsev, A. I. Kirillov, V. F. Mironova, P. I. Pevnaya, P. A. Perepelkin, G. I. Skidan, I. D. Sofronov, B. P. Tikhomirov, E. N. Tikhomirova, N. I. Yurina VANT. Ser.: Mat. Mod. Fiz. Proc. 1995. Вып.4. С. 38.
The paper briefly reviews the codes and methods resulting from many years of experience in the calculation of nonstationary radiant energy transfer using the visibility coefficients. The visibility coefficients determine the geometrical transfer factors; their direct use in the computational schemes allows to increase the description accuracy of the angular distribution of the radiation energy, to account for the solution smoothness discontinuities and derivatives. The capability for solving the problems in complex shape regions can make useful the conversion variants of codes in engineering and research computations in the fields such as development of infrared and neutron emitters, optimization of radiant heating and energy transfer in outer space, computer graphics. Actually there is an increased interest to the use of the visibility coefficients and authors believe it will further increase in view of the evolution of nanosecond technologies.

NUMERICAL SIMULATION OF UNSHOCKED UNLIMITED GAS COMPRESSION IN LAGRANGIAN VARIABLES USING D CODE
A. Yu. Artemiev, V. I. Delov, L. V. Dmitrieva, I. D. Sofronov, Yu. D. Chernyshev VANT. Ser.: Mat. Mod. Fiz. Proc. 1995. Вып.4. С. 4247.
The paper considers unlimited adiabatic compression of gas regions with prism and cone shapes for which the exact, and approximate solutions are obtained by A.F. Sidorov. The discussion is given for the formulation in Lagrangian variables. Brief characteristics are given for Lagrangian D method using regular grid that was used for numerical simulation of gas compression. The numerical results are presented allowing to estimate the feasibility of numerical research for dense and fast jets with D code by comparing with analytical and approximate solutions. The numerical solutions are obtained by setting the velocity and pressure on a moving flexible piston.
