Vladimir Alekseevich. Zharov

• Master of Science
• Researcher at Central Aerohydrodynamics Institute by N.E. Zhukovskii, Rusian Federatiion

Aim: to consider the process of emitting a sound wave (main mode) from a semi-infinite channel without a flange when the air inside and outside the channel is at rest, to develop a procedure for approximating the solution, which allows us to obtain the reflection and transformation coefficients of the main mode wave on the channel slice, as well as...

A weakly nonlinear version of the wave model of a developed turbulent boundary layer is considered. The dispersion characteristics of the main (unstable mode) are qualitatively determined, and the conditions of three-wave resonance of the main mode (Tollmin-Schlichting waves) with the main mode and with waves of a continuous spectrum are analyzed....

This paper considers, in the framework of the model of the developed turbulent flow of an incompressible fluid over a plate in a boundary layer. The problem investigated the formulation of amplitudes in a single-mode approximation through a weakly nonlinear version of the wave model. The dispersion characteristics of the least damping wave mode are...

The aim is to study a model of a developed turbulent flow of an incompressible fluid in a boundary layer on a plate. The study is based on the analysis of the Navier-Stokes equations describing the behaviour of Tollmien-Schlichting wave amplitudes in a single-mode approximation. Methodology. A weakly nonlinear version of the wave model of a develop...

The possibility of the description of the heat transfer processes in the developed turbulent boundary layer on the flat plate at zero angle attack with zero longitudinal pressure gradient in incompressible fluid is considered as a consequence of the waveguide theory of turbulent boundary layer. It is shown that the logarithmic distribution of tempe...

The development of high speed aircraft technology requires continuous improvement of the research processes of heat exchange on the surface of the aircraft. In this paper present the methods for calculating the heat transfer coefficients on surface of high-speed aircrafts. The effective length method is suitable to calculate convective heat transfe...

The most significant problems of numerical schemes development, arising from specific problems of aeroacoustics are formulated. In this paper emphasized the necessity for the standard achievement, in which it is possible to test proposed scheme. The most reliable standard may be exact solution about propagation of sound in formulation approximate t...

Usually the science dealing with the problem of creating coherent radiation is called quantum electronics. Studying the properties of laser radiation has opened new page in science - non-linear optics. It seems that both of these disciplines are very far from the gas dynamics that has no relation to the creation and application of lasers. The purpo...

The advantage of Monte Carlo methods in the computational aerodynamics and application of these methods in rarefied fields are described in the present paper. The direct statistical simulation of aerodynamics processes with the solution of kinetic equations is considered. It is shown that the modern stage of the development of computational methods...

_________________________________________________________________________________ ABSTRACT— The purpose of this work is to analysis the history and future development of hypersonic vehicles all over the world and to determine the aerodynamic and aerothermodynamic characteristics of prospective hypersonic vehicles by using engineering methods at all...

This paper deals with the computational analysis of aerodynamics of space vehicle entering the Earth's atmosphere (from the free-molecular regime to the continuum flow regime) in rarefied gas flow. The use of approximate engineering methods is the most favorable approach to solve problems of spacecraft aerodynamics at the stage of conceptual design...

Approximate approach for the simple description of weakly nonlinear wave packet dynamics in laminar boundary layer is suggested. To this end time dependent integral nonlinear equation was obtained for the spectral amplitudes of disturbances in single-mode approximation with Gauss form of spectral distributions of every component in the state of 3-w...

A method of statistical modeling the flow in the boundary-layer transition region is proposed on the basis of experimental data on kinematics and dynamics of turbulent spots (Emmons spots) on a flat plate in an incompressible fluid. This method allows one to determine the intermittency with allowance for overlapping of the spots, the forces on the...

A statistical method for simulating a boundary layer transition flow is proposed as based on experimental data on the kinematics and dynamics of turbulent spots (Emmons spots) on a flat plate placed in an incompressible fluid. The method determines intermittency with allowance for overlapping spots, which makes it possible to determine the forces o...

The problem of the time-dependent viscous compressible gas flow excited by a small external time-dependent space-and time-periodic force is considered within the framework of the Navier-Stokes equations on a finite interval with periodic boundary conditions. The investigation is carried out numerically for a periodicity interval L, divided by the v...

Exact solutions of the following topics are reviewed: locally Maxwell solutions, spatially uniform relaxation of a binary mixture of gases (moment solutions and a generalization of the Bobylev-Krook-Wu solutions), homoenergetic affine flows (the Galkin-Truesdell class of exact solutions), spherical outflow-inflow (the Nikol'skii transformation), do...

A method for solving equations that describe the dynamics of wave packets of the Tollmien–Schlichting waves in the boundary layer is proposed. The method of splitting the initial problem into the linear and nonlinear parts at each time step is used. The linear part is resolved by using an equation for spectral components of the wave packet with a s...

The method of the wave packet dynamic description for Tollmien-Schlichting waves in boundary layer flow of incompressible fluid is suggested. The method is based on combined using of the one-mode spectral wave components equation and the wave packet envelope equation. This approach is available when splitting of nonlinear equations is used for line...

The relations necessary to calculate Burnett's corrections to the distribution functions of the molecules of multicomponent mixtures of polyatomic gases are derived. Effective expressions for the transport properties and “working” formulae for the transport coefficients of a binary mixture of monatomic gases and a polyatomic gas in Burnett's approx...

Using the method of moments in the space of wavenumbers, a class of models of a developed turbulent flow of an incompressible fluid in a flatplate boundary layer is proposed. The models are based on an analysis of the Navier–Stokes equations that describe the behavior of dynamic coherent structures associated with vorticity generation and also the...

Expressions for the linear Burnett transport properties with transfer coefficients in the Mason-Monchik approximation are presented. Problems of sound propagation and the structure of a weak shock wave are solved using them.

A Blasius laminar boundary layer and a steady turbulent boundary layer on a flat plate in an incompressible fluid are considered. The spectral characteristics of the Tollmien—Schlichting (TS) and Squire waves are numerically determined in a wide range of Reynolds numbers. Based on the spectral characteristics, relations determining the three–wave r...

The weakly linear version of the wave model of developed turbulent boundary layer is analyzed. The dispersion characteristics of the principal (unsteady) mode are determined quanlitatively, the conditions of three-wave resonance of the principal mode (Tollmien-Schlichting waves) with the fundamental mode and with waves of the continuous spectrum ar...

The problem of determining the electromagnetic field in an open unstable telescopic resonator filled with an active medium at high Fresnel numbers in regimes close to the threshold for laser action is considered. The method of matching asymptotic expansions is used to solve the initial equations. The cases when (L is the distance between the mirror...

In connection with the creation of fast-flow lasers, it is of great interest to investigate the characteristics of the electromagnetic field in open resonators filled with nonlinear active medium at large Fresnel numbers Fr, reaching 103-104 in practice. Numerical solution of the wave equation in the parabolic approximation at such Fr is complicate...

The problem of determining the slippage rate for a binary mixture of gases is considered on the basis of the linearized model equations of Hamel. It is shown that in a certain case the equations can be reduced to equations that are analogous to those applying to a one-component gas. We consider the flow of a gas mixture next to a plane wall in the...