Mathematical Models and Computer Simulations

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Numerical simulation of impact of a jet on a wall
Mathematical Models and Computer Simulations - - 2017
А. А. Аганин, Т. С. Гусева
Numerical model of a turbulent flow behind a heated grid in a wind tunnel
Mathematical Models and Computer Simulations - Tập 4 - Trang 321-335 - 2012
M. K. Baev, G. G. Chernykh
A closure of the Corrsin equation is performed using the gradient hypothesis connecting a third-order mixed correlation moment with a second-order two-point correlation function of a passive scalar field. A numerical model of the locally isotropic turbulence is constructed based on the closed system of the Kolmogorov and Yaglom equations. On the assumption of constant Loitsiansky and Corrsin invar...... hiện toàn bộ
Numerical modeling of laser sintering of two-component powder mixtures
Mathematical Models and Computer Simulations - Tập 3 - Trang 723-731 - 2011
V. G. Niziev, A. V. Koldoba, F. Kh. Mirzade, V. Ya. Panchenko, Yu. A. Poveschenko, M. V. Popov
The process of direct sintering of metal powders induced by laser radiation is investigated. A two-component mix of powders consisting of low- and high-melting components is considered. The model is based on a self-consistent nonlinear equation of continuity for volume fractions of low- and high-melting components of the mixture and on the equation of energy transfer in the melt-powder mixture sys...... hiện toàn bộ
Boundary Conditions in Bicompact Schemes for HOLO Algorithms to Solve Transport Equations
Mathematical Models and Computer Simulations - Tập 12 Số 3 - Trang 271-281 - 2020
Е. Н. Аристова, Наталия Игоревна Караваева
A Numerical Study of the Effect of an Obstacle on the Flow around a Vertical-Axis Wind Turbine
Mathematical Models and Computer Simulations - - 2022
A. E. Bondarev, A. V. Bondarenko, V. A. Galaktionov, V. T. Zhukov, K. V. Manukovskii, N. D. Novikova, O. B. Feodoritova
The results of numerical simulation of a vertical-axis wind turbine (VAWT) based on the solution of three-dimensional Reynolds-averaged Navier–Stokes equations with the Spalart–Allmaras turbulence model are presented. The results of parametric calculations of a viscous compressible flow under conditions simulating urban infrastructure for a helicoid-type wind turbine with three spirally twisted bl...... hiện toàn bộ
Simulation of quantum dynamics of a wave packet in a semiclassical limit
Mathematical Models and Computer Simulations - Tập 3 Số 5 - Trang 629-636 - 2011
K. S. Arakelov
Efficiency of quasi-diffusion method for calculating critical parameters of a fast reactor
Mathematical Models and Computer Simulations - Tập 4 - Trang 568-573 - 2012
E. N. Aristova, D. F. Baydin
The efficiency of different implementations of the iterative process for solving a multigroup system of transport equations on the basis of the quasi-diffusion method is considered. Computations are performed for a two-dimensional model of the core of the BN-800 reactor working in the selfadjustable neutron-nuclear regime (SANNR). The results of this work make it possible to develop efficient meth...... hiện toàn bộ
Construction of substantially different solutions of an inverse problem for a toroidal plasma equilibrium equation
Mathematical Models and Computer Simulations - Tập 2 - Trang 334-340 - 2010
F. S. Zaitsev
The paper is devoted to the reconstruction of the current density in toroidal plasma, using experimentally measured data. The toroidal current density is characterized by two functions in the right-hand side of the Grad-Shafranov equation which, together with the poloidal flux, is to be deter-mined. The question about the uniqueness of the solution of the inverse problem was usually not addressed ...... hiện toàn bộ
Sufficient stability conditions in the calculations of steady supersonic flows using the marching technique and time-dependent flows with account for viscosity
Mathematical Models and Computer Simulations - Tập 1 - Trang 113-123 - 2009
V. G. Grudnitskii
The sufficient conditions for the stability and monotonicity in calculating supersonic steady flows by means of the marching technique are derived. The sufficient stability conditions are also obtained for constructing the solutions of time-dependent conservation laws with account for viscosity by explicit difference schemes. With increase in the viscosity coefficient, the conditions derived go ov...... hiện toàn bộ
Numerical simulation of processes in solid deformable media in the presence of dynamic contacts using the grid-characteristic method
Mathematical Models and Computer Simulations - Tập 6 - Trang 294-304 - 2014
K. A. Beklemysheva, I. B. Petrov, A. V. Favorskaya
Several problems of dynamic deformation in the presence of movable contacting surfaces are considered. A grid-characteristic method is adapted using two-dimensional irregular triangular grids and a hybrid scheme of the first or second order of approximation. An algorithm for the calculation of sliding and static friction is proposed. We obtained the numerical solution for problems of wheel rolling...... hiện toàn bộ
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