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M. N. Ovchinnikov

Publications and source records attributed to M. N. Ovchinnikov.

4 recordsLinked to original sources
arXiv2019

The velocity of dynamical chaos during propagation of the positive Lyapunov exponents region under non-local conditions

The dynamics of the system is investigated when one part of the system initially behaves in a regular manner and the other in a chaotic one. The propagation of the chaos is considered as the motion of a region with the maximal Lyapunov exponent greater than zero. The time dependencies of the chaos propagation parameters were calculated for the classical and non-local models of non-stationary heat transfer. The system responses were considered to disturbances in the form of the Dirac delta function and the Heaviside step function.

cond-mat.stat-mech↗
arXiv2015

About Relationship Between Flux and Concentration Gradient of Particles at Description of Diffusion with the Usage of Random Walk Model

The fundamental solutions of diffusion equation for the local-equilibrium and nonlocal models are considered as the limiting cases of the solution of a problem related to consideration of the Brownian particles random walks. The differences between fundamental solutions were studied. It was shown that on the period of observation time and distances exceeding the time and space associated with one step of random walk the fundamental solutions of diffusion and telegraph equations are very close to each other. In particular, these fundamental solutions are very close to the values of the probability density distribution of diffusive particles that is obtained from the accurate solution of the random walk problem. The new modified non-local diffusion equation is suggested. It contains only microparameters of the random walk problem.

math-ph↗
arXiv2000

The modifications of customary filtrational equation

The usable limits of the customary and relaxational filtrational theories are considered. The questions of applicable the locality and local thermodynamical equilibrium principles to depict the nonstationary flows are discussed. The experimental procedures are proposed to determine the filtrational flows relaxation times.

physics.flu-dyn↗