## Numerical simulation of various scenarios of nonlinear evolution in a beam-plasma system

This paper is aimed at studying the efficiency of the electromagnetic radiation generation in various nonlinear processes occurring during the beamplasma interaction. The beam and plasma parameters were chosen close to the parameters in the experiment on the GOL-3 facility (BINP SB RAS). The research was conducted by means of...

## Parallel template implementation of a Particle-in-Cell code for the simulation of ultrarelativistic beam dynamics

In order to simplify the development of high-performance plasma physics codes for hybrid supercomputers, a template implementation of the Particlein-Cell (PIC) method was created. The template parameters are the problemspecific implementations of "particle" and "cell" (as C++ classes).

Thus, it is possible to develop a PIC code for the supercollider...

## The numerical simulation of interacting galaxies by means of hybrid supercomputers

In this paper, a new hydrodynamic numerical simulation of interacting galaxies is proposed. The main subgrid physics processes are: the star formation, the supernovae feedback, the cooling function and the molecular hydrogen formation. The collisionless hydrodynamic approach was used for the simulation of the stars and dark matter. An approach...

## A parallel method for reliability calculation of diameter constrained networks

The problem of network reliability calculation is studied. It is assumed that a network has unreliable communication links and perfectly reliable nodes. The diameter-constrained reliability for such a network is defined as probability that every pair of terminals of network is connected by operational paths with a number of included...

## Comparison between combinations of the splitting and the variational data assimilation schemes for atmospheric chemistry transport models

The atmospheric chemistry dynamics with a convection-diffusion model is studied. The numerical Data Assimilation (DA) algorithm presented is based on the additive-averaged splitting schemes. It carries out "fine-grained" variational data assimilation at separate splitting stages with respect to the spatial dimensions, i.e., the same measurement data are assimilated with different...

## Particle reordering optimization in the Particle-in-Cell method implementation for the GPU-based supercomputers

The main point of the performance of a code for a GPU (Graphical Processing Unit) is data locality. For the PIC method this means that all the particles belonging to one cell must be located closely in memory. During the particle push the particles might move to other cells, and...

## Optimized parallel algorithm for solving the Poisson equation in non-stationary problems

We compare two algorithms for solving the Poisson equation: the first one is based on domain decomposition with direct coupling of subdomains (DDCS) and the second one is based on multidimensional Fast Fourier Transform and data transposition (FFTT).

Results of the comparison made helped us to introduce several optimizations for...

## A domain decomposition algorithm using SPH and PIC methods for simulating gas-dust gravitating disks

We present a new parallel algorithm for supercomputer simulation of gas-dust circumstellar gravitating disks. The algorithm uses the domain decomposition technique and combines numerical methods of smooth particle hydrodynamics (SPH), particle-in-cell (PIC) and grid-based gravitational solver with the convolution method and parallel multidimensional Fast Fourier Transform.

The algorithm is designed...

## Hybrid simulation of collisionless shock waves using the PIC-method

We present a 2D hybrid numerical plasma model for the simulation of the physical processes in supernova remnant shock precursor. In simulation, a shock is generated by sending a supersonic ow against a reflecting wall. The interaction between the incoming and reflected streams produces a sharp discontinuity, which moves away...