Latest releases in the series
Computer-Aided Engineering (CAE) systems face significant challenges in modeling complex, nonlinear, and discrete engineering phenomena. Traditional numerical methods based on partial differential equations struggle to accurately simulate systems with intricate spatial dynamics and stochastic…
cellular automata, Computer-Aided Engineering, COMSOL Multiphysics, Simulation Modeling, Data ConversionIn this paper, we consider a one-dimensional inverse source problem for the Hopf equation. We show that it is uniquely solvable in the class of finite smoothness.
The direct dynamic problem of elasticity theory is solved numerically taking into account the energy dissipation caused by viscous (internal) friction, which models the formation and propagation of seismic waves from earthquakes. The problem is written in the form of dynamic equations of elasticity…
Elastic medium, seismic waves, earthquakes, direct problem, Laguerre transform, difference schemeUsing the example of the 14 largest earthquakes (MS ≥ 7.9) in area: −30–50°N, 78–180°E, the possible geodynamic interconnectedness of the processes of focus preparation with a preliminary moderate seismic activation in the subduction or collision zones crossing the areas of a future earthquake…
catalogs of earthquakes, parameters of the seismic geodynamic process, tectonic conditions, seismic activation systems, strong earthquakes, creepexThe paper numerically studies the flow of a high-temperature twophase mixture in a gravity field. Thermodynamically consistent equations of twospeed hydrodynamics of a suspension with a foreign impurity are developed within the framework of the conservation law method. The numerical non-stationary…
suspension, impurity, two-velocity hydrodynamics, heat and mass transfer, conservation law method, control volume methodThe inverse problem of determining a distributed source from a porodynamic system described by three elastic parameters in a reversible hydrodynamic approximation is considered. A theorem on solvability in the class of twice continuously differentiable in time and having Fourier transforms in the…
porous medium, Cauchy problem, direct problem, inverse problem, slow wave, porosityPotential 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…
potential vorticity streamers and cutoffs, Rossby wave breaking, climate modelingA 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 Arctic…
Arctic Ocean, sea ice, climate variability, numerical modelingThe 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…
Arctic Ocean, Laptev Sea, climate variability, numerical modelingIn 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…
Novosibirsk reservoir, three-dimensional thermodynamic model, the local one-dimensional ice modelA 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 graph of a…
hydrologically correct digital model, Lena River basin, linear formation model of water balance, channel network, surface runoff, river flow, dischargeIn 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…
source identification, inverse problem, continuation problem, adjoint equations, advection-diffusion-reactionThe 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…
satellite images, plume, buoyancy flow, atmosphere, hydrodynamics equations, impurities elevation heightConditional 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…
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…
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…
portability, hybrid supercomputers, GPU, function variables, computational plasma physicsThe 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…
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…
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…
ill-posed problem, numerical method, scattering phase function, water drop clouds in the atmosphere, size distribution of water dropletsIn 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…
elastic waves, 3D simulation, co-design, finite difference schemes, hybrid cluster, GPUNew 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…