DESCRIPTION OF A TEST SET FOR 2-D PROCEDURES AND PROGRAMS IN GAS DYNAMICS. PT. 1

Yu. A. Bondarenko, B. L. Vоrоnin, V. I. Delоv, E. N. Zubоv, N. P. Kоvalуоv, S. S. Sокоlоv, V. E. Shmarulin
VANT. Ser. Mat. Mod. Fiz. Proc 1991. Вып.2. С. 3-9.

      A problem set is proposed designed for testing 2-D procedures and programs in gas dynamics. The authors kept in mind that a test problem must have properties similar to those of most typical actual problems. It is desired for the test problem to have an exact solution. The set consists of 15 tests. This part contains the first seven tests while the others are presented in part 2.

      A problem set is proposed designed for testing 2-D procedures and programs in gas dynamics. The authors kept in mind that a test problem must have properties similar to those of most typical actual problems. It is desired for the test problem to have an exact solution. The set consists of 15 tests. The first seven are described in part 1 while this part contains the others.

      Multichannel computer and KAMAK-hardware based analyzers are widely uaed for investigations in nuclear physics. Most of implemented analyzer programs are oriented to a fixed recorder system structure and perform within a specific experiment. For a broad range of multiparameter experiments, the general purpose pulse analyzer program provides a flexible organization of spectrometry measurements based on KAMAK-hardware.
      The program tuning to a specific configuration of a measurement KAMAK system, structure definition of data to be accumulated and experiment monitoring are performed in an interactive mode. The program includes service capabilities for data set control, spectrometry data visualization, its simplest preprocessing and holding it on external magnetic media, along with facilities for measurement process automatization.
The program is written in Assembler language and executes on the SM and Electronica-60 computers under OS RAFOS or RT-11.

      The paper proposes a hybrid plasma model modification to take into account nonelastic particle collisions leading to changes of ion charge states. Particle recharge and ionization kinetics is described by a collision integral, quasilinear in distribution function, which was obtained using small ion velocity and energy change approximations for nonelastic collisions.
      A numerical solution of a kinetic equation for the plasma ion component is defined by a particle method including a way to account collisions specially developed based on splitting by physical processes. Numerical results are given for two test problems related to recharge kinetics in moving plane plasma flows.

      A widely used discontinuity breakup model is considered based on replacing rarefaction waves by rarefaction "jumps" assuming that left and right quantities differ only slightly. Numerical results of shock-initiated nozzle and detonation ware propagation from a closed tube and calculations with the Godunov scheme are analyzed. For this type of problems, an approximate discontinuity breakup model is shown to give errors in the numerical solution and to distort the results. The calculations indicate that more accurate models must be used in the Godunov scheme.