lazareva_4.pdf303.55 KB
At INP SB RAS, various mechanisms for the erosion of tungsten samples
during the pulsed heating were studied. Data were obtained that made it
possible to analyze the experimental results of the surface temperature dynamics
taking into account the cooling due to the vaporation in vacuum. A numerical
model was...
medvedev_2.pdf746.3 KB
A two-dimensional case of the process of laminar flow passing through
a pipe constriction is investigated. The two-dimensional statement corresponds
to the case with a three-dimensional flow between two parallel planes. A cellular
automaton model of a flow is used, which has an integer alphabet of cell states and
a...
migov_1.pdf608.11 KB
The problem of the network reliability calculation is studied. As the
network reliability we mean the classical reliability measure, i.e. the network probabilistic connectivity. It is assumed that the network has unreliable communication
links and perfectly reliable nodes. The problem of computing this characteristic is
known to be NP-hard. For...
snytnikov_2.pdf1.08 MB
Computational plasma physics problems are a wide field with its own
hardware, software and scheduling strategies. There is a set of physical phenonena,
mathematical equations, numerical approaches, programming strategies and architecture concepts directly followed by each other. This means that an efficient code
for the plasma physics must involve all...
tarkov_5.pdf192.63 KB
The influence of the weight quantization levels number on a capsule
neural network functioning quality is studied. The network is tested on the MNIST
dataset recognition. It is shown that to achieve the performance of the network
with continuous weights it is enough to have 16 levels of uniform quantization...
imomnazarov_0_1.pdf438.56 KB
The paper illustrates the applicability of the Laguerre spectral method to solving a one-dimensional problem of the dynamics of a saturated porous medium. A one-dimensional non-stationary problem of a pulsed action on a saturated porous medium is investigated taking into account the effects of electromagnetoacoustics. The features of the acoustic...
kalinnikov_v2.pdf667.47 KB
The paper explores the possibility of modifying the creepex (creep and explosion) parameter, an increase in its informativeness and applicability of using public catalogs by the GIS-ENDDB geoinformation system. Instead of the canonical form of the creepex (Cr = MS - kmb - l), the introduced normalized...
marchuk_12.pdf1.03 MB
Application of the variation method to simulate tsunami wave rays and to estimate the wave travel times corresponding is studied. In some cases, the wave ray determined by this method, connecting two points of the water area, may not present the global extreme, which provides the shortest tsunami travel time...
mikheeva_v2.pdf489.57 KB
In order to explain the process of forming the outer rings of an impact crater, a model of an underground explosion of an impactor penetrating into the target is proposed. Intense crushing of the surface rocks is explained by the effect of the primary compression wave if it propagates from...
perepechko_3.pdf578.3 KB
The paper studies the flow of a two-phase medium in a gravity field channel. The thermodynamically consistent equations of the mathematical model of the dynamics of a two-velocity medium with an admixture were developed within the framework of the method of conservation laws. Its numerical implementation was carried out based...
vasiliev_0.pdf335.63 KB
The paper considers a system of equations of motion of a two-phase medium with phase equilibrium in terms of pressure and temperature. The spectral analysis of the system was carried out for a one-dimensional case. Approximate numerical solutions of the Riemann problem about the decay of an arbitrary discontinuity were...
boronina.pdf324.28 KB
Conditional stability of explicit schemes in finite differences complicates the choice of a time step. The increase in the number of the grid nodes for more precise computations and the corresponding space step decrease leads to the increase in computer costs due to the decreasing of the time step. We...
dudnikova.pdf381.51 KB
The self-consistent evolution of the ion-acoustic collisionless shock with shock-reflected ions is numerically studied with kinetic simulations. We want to compare different approaches to the shock simulation based on the PIC-method. The results of one-dimensional fully kinetic simulation for both plasma components with the real ion-to-electron mass ratio are compared...
genrikh.pdf297.61 KB
Today the method for the development of portable numerical simulation programs is very important because of the two main reasons. The first reason is the diversity of supercomputer architectures in Top500 and the second one is a demand for using the most powerful computers to simulate, for example, plasma. The...
lazareva.pdf512.76 KB
The paper reviews the problem of forecasting the possible maximum pressure at the well-head, at the well-bore and at near-wellbore zone of reservoir during the process of new stimulation technology like reactive chemistry application. The technology provides stimulation by thermobaric effects. This impact occurs as a result of thermal decomposition...
perepechko.pdf751.2 KB
This paper investigates a magma flow in permeable zones of the lithosphere. The model equations describing the dynamics of saturated porous media both without tangential stresses and with them are presented. The phenomenological method used for deriving the equations provides the thermodynamic correctness. Based on the model of the heterophase...
prigarin.pdf374.42 KB
This paper deals with an ill-posed problem to determine the size distribution for water drops in a cloud from a given scattering phase function. Numerical experiments have shown that a method based on non-negative least squares with additional requirements of smoothness can be used to solve the ill-posed problems.
sapetina.pdf325.44 KB
In order to create systems of vibroseismic monitoring for earthquakeprone areas it is needed to carry out the simulation of seismic wave propagation in the media typical of volcanic structures. To this end it is required to develop supercomputer technologies for decreasing the computation time and simulation of "big" 3D...
stoyanovskaya.pdf629.72 KB
New parallel algorithm is developed for simulating the dynamics of a thin circumstellar disk. It is based on the combination of a gridless method of smoothed particle hydrodynamics (SPH) and the grid-based convolution method for calculating a gravitational potential. To develop the algorithm, we made software profiling of numerical experiments...
borovko_3.pdf331.53 KB
Potential vorticity (PV) streamers and cutoffs are indicators to the Rossby wave breaking (RWB) near the extratropical tropopause. In the Rossby waves breaking, the formation of elongated high-PV stratospheric air tongues extending to the equator and tropospheric low PV air tongues extending to the pole are obtained. There are two...
iakshina_0.pdf985.64 KB
A numerical simulation of the water and sea ice dynamics of the Arctic Ocean was carried out to identify the physical mechanisms that determine the variability of the state of the ice cover. For the research, we used the coupled ocean-ice regional numerical model of the North Atlantic and the...
kraineva_0.pdf683.79 KB
The Laptev Sea, one of the most severe Arctic shelf seas is the focus of the international research on account of a pronounced climate change (warming of the atmosphere temperature, lengthening of the summer open-water season, reduction of the ice extent, rapid coastal erosion). In recent years, as compared to...
kravtchenko.pdf1.67 MB
In this paper, the adaptation of the SibCIOM three-dimensional thermodynamic model is considered that allows modeling a three-dimensional velocity and temperature distribution, as well as a two-dimensional field of the ice cover for the Novosibirsk reservoir with seasonal changes in the water level. An analysis of the numerical results shows...
krylova_2.pdf671.92 KB
A hydrologically correct digital model of the bottom topography of the Lena River basin with a resolution of (1/3)° x (1/3)° is constructed. Based on the linear model of forming a water balance in the river-bed network and a model network of river channels schematized in the form of a...
penenko_5.pdf1.63 MB
In the data assimilation algorithms for the air quality applications, the source identification problem can be considered as an auxiliary one for the solution of the model state function continuation problem. The algorithm based on the ensembles of the adjoint problem solutions is applied to solve the inverse problems. The...
raputa_8.pdf1.25 MB
The satellite observations of smoke plumes from the pipes of power stations make possible to obtain prompt information about the processes of impurities distribution in the atmosphere and about the source parameters. This paper proposes a method of numerical reconstruction of characteristics of the active stage of the smoke stream...