共查询到20条相似文献,搜索用时 15 毫秒
1.
V. I. Bukreev E. M. Romanov N. P. Turanov 《Journal of Applied Mechanics and Technical Physics》1998,39(2):205-210
Experimental data on gravity shallow-water waves generated by a vertical plate moving in a predetermined manner are given.
The plate completely covers the cross section of the channel. It is found that with when the wave speed exceeds the first
critical value known in hydraulics, the wave retains smoothness. Breaking of the waves begins at the second critical speed
(which is about 1.3 times as high), whose value coincides with the limiting propagation speed of a solitary wave.
Lavrent'ev Institute of Hydrodynamics, Siberian Division, Russian Academy of Sciences, Novosibirsk 630090. Translated from
Prikladnaya Mekhanika i Tekhnicheskaya Fizika, Vol. 39, No. 2, pp. 52–58, March–April, 1998. 相似文献
2.
V. I. Bukreev 《Journal of Applied Mechanics and Technical Physics》1999,40(3):399-406
Experimental data on surface solitary waves generated by five methods are given. These data and literature information show
that at amplitudes 0.2<a/h<0.6 (h is the initial depth of the liquid), experimental solitary waves are in good agreement with
their theoretical analogs obtained using the complete model of liquid potential flow. Some discrepancy is observed in the
range of small amplitudes. The reasons why free solitary waves of theoretically limiting amplitude have not been realized
in experiments are discussed, and an example of a forced wave of nearly limiting amplitude is given. The previously established
fact that during evolution from the state of rest, undular waves break when the propagation speed of their leading front reaches
the limiting speed of propagation of a solitary wave is confirmed.
Lavrent’ev Institute of Hydrodynamics, Siberian Division, Russian Academy of Sciences, Novosibirsk 630090. Translated from
Prikladnaya Mekhanika i Tekhnicheskaya Fizika, Vol. 40, No. 3, pp. 44–52, May–June, 1999. 相似文献
3.
N. V. Gavrilov E. V. Ermanyuk 《Journal of Applied Mechanics and Technical Physics》1999,40(2):258-262
Propagation of internal waves over a circular cylinder under the conditions of a continuous stratification characterized by
the presence of a high-gradient density layer (the pycnocline) of finite thickness is studied. The dependences of the coefficent
of wave propagation on the wavelength of the first-mode incident wave for various thicknesses of the pycnocline are obtained.
In the diffraction of internal waves, substantial nonlinear effects are shown to occur, which result in the appearance of
waves of double oscillation frequency compared to the frequency of the incident waves. The generation coefficient for these
waves is found.
Lavrent’ev Institute of Hydrodynamics, Siberian Division, Russian Academy of Sciences, Novosibirsk 630090. Translated from
Prikladnaya Mekhanika i Tekhnicheskaya Fizika, Vol. 40, No. 2, pp. 79–85, March–April, 1999. 相似文献
4.
The process of propagation of shock waves in two-component mixtures is considered. The studies were performed within the framework
of the two-velocity approximation of mechanics of heterogeneous media with account of different pressures of the components.
The stability of propagation of all types of stationary shock waves (fully dispersed, frozen-dispersed, dispersed-frozen,
and frozen shock waves of two-front configuration) to infinitesimal and finite perturbations is shown numerically, using the
method of coarse particles. The problem of initiation of shock waves (the formation of different types of shock waves from
stepwise initial data) is solved. Flows in the transonic range relative to the speed of sound in the first component are obtained.
Institute of Theoretical and Applied Mechanics, Siberian Division, Russian Academy of Sciences, Novosibirsk 630090. Translated
from Prikladnaya Mekhanika i Tekhnicheskaya Fizika, Vol. 40, No. 1, pp. 55–63, January–February 1999. 相似文献
5.
Yu. A. Drozdova 《Fluid Dynamics》2000,35(4):591-598
Nonlinear waves of small amplitude in wide horizontal channels are considered. The channel depth is assumed to be a function
weakly dependent on the transverse coordinate. To describe the waves, the two-dimensional Boussinesq equations in the form
obtained in this paper are used. Stationary solutions in the form of a soliton followed by a set of sinusoidal waves are found.
The phase velocity of these waves in the channel direction is equal to the soliton velocity.
Moscow. Translated from Izvestiya Rossiiskoi Akademii Nauk, Mekhanika Zhidkosti i Gaza, No. 4, pp. 147–155, July–August, 2000.
The work was financially supported by the Russian Foundation for Basic Research (project No. 99-01-00277). 相似文献
6.
A linearized equation of the internal waves developing in an ideal stratified gas under the action of potential vortices concentrated
in a vertical cylinder is obtained. The Cauchy problem for the internal wave equation with right side depending on the vortex
intensity is solved by the integral transform method. In the case of a vortex filament the exact solution is found. Approximate
formulas are obtained on the basis of the steady-phase method when the vorticity is exponentially stratified along the vertical.
Expressions for the phase velocity and amplitude of the radial wave traveling away from the cylindrical vortex are found.
Moscow. Translated from Izvestiya Rossiiskoi Akademii Nauk, Mekhanika Zhidkosti i Gaza, No. 1, pp. 118–123, January–February,
1998.
The work was carried out with the support of the Russian Foundation for Fundamental Research (project No. 96-01-04599). 相似文献
7.
V. M. Teshukov 《Journal of Applied Mechanics and Technical Physics》1999,40(2):263-275
Generalized characteristics and Riemann invariants that are preserved along the characteristics are found for a kinetic model
of motion of bubbles in a fluid. Conditions that ensure the hyperbolicity of a set of equations of a bubbly flow are obtained.
It is shown that the set of equations of motion has an infinite number of conservation laws. An infinite series of generalized
symmetries admitted by the equations is constructed. Solutions that are invariant under the generalized symmetries of solution
and describe the propagation of running and simple waves in a bubbly fluid are found.
Lavrent’ev Institute of Hydrodynamics, Siberian Division, Russian Academy of Sciences, Novosibirsk 630090. Translated from
Prikladnaya Mekhanika i Tekhnicheskaya Fizika, Vol. 40, No., 2. pp. 86–100, March–April, 1999. 相似文献
8.
V.Yu Zakharov 《Fluid Dynamics》1998,33(3):466-467
The effect of finite Hall dispersion on the propagation of linear waves is studied within the framework of isotropic magnetohydrodynamics.
It is shown that the presence of finite dispersion does not lead to instability of the uniform plasma state.
Moscow. Translated from Izvestiya Rossiiskoi Akademii Nauk, Mekhanika Zhidkosti i Gaza, No. 3, pp. 205–206, May–June, 1998.
The work was carried out with financial support from the Russian Foundation for Basic Research (project No. 94-01-01383). 相似文献
9.
V. I. Bukreev 《Journal of Applied Mechanics and Technical Physics》1998,39(5):659-665
Results of experimental studies of surface and internal waves generated by translational motion of a vertical plate covering
the entire cross section of the channel are discussed. It is found that the waves do not break at the critical propagation
speeds predicted by the linear theory or the first approximation of shallow water theory. Breaking begins only at higher propagation
speeds, at which the stabilizing effect of wave dispersion ceases. Quantitative information is given that can be used to test
mathematical models and numerical methods.
Lavrent'ev Institute of Hydrodynamics, Siberian Division, Russian Academy of Sciences, Novosibirsk 630090. Translated from
Prikladnaya Mekhanika i Tekhnicheskaya Fizika, Vol. 39, No. 5, pp. 11–18, September–October, 1998. 相似文献
10.
The problem of the unsteady propagation of a thermal detonation wave in a high-temperature-melt-water system up to the steady-state
regime is considered on the basis of the three-dimensional and three-temperature vapor explosion model. The basic laws of
wave evolution are analyzed and the wave structure is studied.
Moscow. Translated from Izvestiya Rossiiskoi Akademii Nauk, Mekhanika Zhidkosti i Gaza, No. 4, pp. 115–125, July–August, 2000.
The work was supported by the Russian Foundation for Basic Research (project No. 98-02-17766) and the International Science
and Technology Center (project No. 408). 相似文献
11.
V. I. Bukreev 《Journal of Applied Mechanics and Technical Physics》2000,41(4):585-592
Four experimentally observed unstable and resonant regimes of generation of internal waves by a moving or oscillating cylinder
are considered. Two of them can be treated as a manifestation of the critical-layer effect, but for the group rather than
for the phase speed of propagation of small perturbations, one regime can be regarded as a manifestation of the effect of
compaction of the energy of two waves, and one more regime admits both of the indicated treatments.
Lavrent'ev Institute of Hydrodynamics, Siberian Division, Russian Academy of Sciences, Novosibirsk 630090. Translated from
Prikladnaya Mekhanika i Tekhnicheskaya Fizika, Vol. 41, No. 4, pp. 12–20, July–August, 2000. 相似文献
12.
N. D. Dikovskaya B. Yu. Zanin 《Journal of Applied Mechanics and Technical Physics》1999,40(1):108-113
The problem of the origin and evolution of two-dimensional waves of unstable disturbances in the boundary layer on an airfoil
in the region of adverse pressure gradient in the preseparation flow region is solved numerically. The stability of the experimental
velocity profiles, including the inflected profiles, is studied. As a result of the calculations, the boundaries of the instability
region and the parameters of the maximally unstable disturbances (frequency, growth rate, wavelength, and propagation velocity)
are determined for each velocity profile. The characteristics obtained in the present work are in good agreement with the
real experimental parameters of instability waves.
Institute of Theoretical and Applied Mechanics, Siberian Division, Russian Academy of Sciences, Novosibirsk 630090. Translated
from Prikladnaya Mekhanika i Tekhnicheskaya Fizika, Vol. 40, No. 1, pp. 126–132, January–February, 1999. 相似文献
13.
V. Yu. Liapidevskii 《Journal of Applied Mechanics and Technical Physics》1999,40(2):238-248
A mathematical model for the propagation of nonlinear long waves is constructed with allowance for nonhydrostatic pressure
distribution and the development of a surface boundary layer due to wave breaking. The problem of the structure of a bore
in a homogeneous liquid is solved. In particular, the transition of a wave bore to a turbulent bore as its amplitude increases
is described within a single model.
Lavrent’ev Institute of Hydrodynamics, Siberian Division, Russian Academy of Sciences, Novosibirsk 630090. Translated from
Prikladnaya Mekhanika i Tekhnicheskaya Fizika, Vol. 40, No. 2, pp. 56–68, March–April, 1999. 相似文献
14.
Stationary two-dimensional gravity waves on the free surface of a homogeneous fluid in a rectangular vessel in the presence
of vertical oscillations excited in harmonic Faraday resonance with identical frequencies are investigated. For the second
mode, the dependence of the amplitude on the excitation frequency is found and the wave profiles are obtained. The experimental
results are compared with the theoretical model.
Moscow. Translated from Izvestiya Rossiiskoi Akademii Nauk, Mekhanika Zhidkosti i Gaza, No. 1, pp. 185–188, January–February,
2000.
The work was supported by the Russian Foundation for Basic Research (project No. 99-01-01080) and CONACYT (Mexico, Catedra
Patrimonial, S. Ya. Sekerzh-Zen’kovich, Ref. 489100-2, Exp. 950060). 相似文献
15.
The interaction of a uniform hypersonic gas flow with a supersonic two-phase gas-particle source is considered. In the symmetry-axis
neighborhood between the bow and termination shock waves, an approximate analytical solution for the carrier-phase parameters
is found. On the basis of parametric numerical calculations, the behavior of the particle trajectories and the concentration
distribution in the shock layers are studied for both continuum and free-molecule flow regimes around the particles. The appearance
of regions with multiple intersections of the particle trajectories and the formation of "layer structures" in the particle
concentration distributions (particle accumulation regions near the envelopes of the particle trajectories) are indicated.
The dependence of the number of the high concentration layers on the governing parameters is studied.
Moscow. Translated from Izvestiya Rossiiskoi Akademii Nauk, Mekhanika Zhidkosti i Gaza, No. 3, pp. 134–147, May–June, 1998.
The work received financial support from the Russian Foundation for Basic Research (project No. 96-01-00313) and the National
Foundation for Natural Sciences of China (joint RFBR-NFNS grant No.96-01-00017c). 相似文献
16.
The far field asymptotics of internal waves is constructed for the case when a point source of mass moves in a layer of arbitrarily
stratified fluid with slowly varying bottom. The solutions obtained describe the far field both near the wave fronts of each
individual mode and away from the wave fronts and are expansions in Airy or Fresnel waves with the argument determined from
the solution of the corresponding eikonal equation. The amplitude of the wave field is determined from the energy conservation
law along the ray tube. For model distributions of the bottom shape and the stratification describing the typical pattern
of the ocean shelf eract analytic expressions are obtained for the rays, and the properties of the phase structure of the
wave field are analyzed.
Moscow. Translated from Izvestiya Rossiiskoi Akademii Nauk, Mekhanika Zhidkosti i Gaza, No. 3, pp. 111–120, May–June, 1998.
This work was financially supported by the Russian Foundation for Basic Research (project No. 96-01-01120). 相似文献
17.
V. V. Ostapenko 《Journal of Applied Mechanics and Technical Physics》1999,40(4):647-654
A mathematical model is developed for formation and propagation of discontinuous waves caused by sliding of a shoreside landslide
into water. The model is based on the equations of a two-layer “shallow liquid” with specially introduced “dry friction” in
the low layer, which allows one to describe the joint motion of the landslide and water. An explicit difference scheme approximating
these equations is constructed, and it is used to develop a numerical algorithm for simulating the motion of the free boundaries
of both the landslide and water (in particular, the propagation of a water wave along a dry channel, incidence of the wave
on the lakeside, and flow over obstacles).
Lavrent’ev Institute of Hydrodynamics, Siberian Division, Russian Academy of Sciences, Novosibirsk 630090. Translated from
Prikladnaya Mekhanika i Tekhnicheskaya Fizika, Vol. 40, No. 4, pp. 109–117, July–August, 1999. 相似文献
18.
V. I. Bukreev V. V. Degtyarev A. V. Chebotnikov 《Journal of Applied Mechanics and Technical Physics》2008,49(5):754-761
This paper presents results of an experimental study of waves generated by partial break of two model dams. The previously
proposed calculation methods are extended and compared with the experimental data obtained. It is shown that the wave propagation
speed in the tailwater is significantly influenced by the energy losses due to flow through the breach.
__________
Translated from Prikladnaya Mekhanika i Tekhnicheskaya Fizika, Vol. 49, No. 5, pp. 61–69, September–October, 2008 相似文献
19.
The propagation of shock waves in a medium with a nonuniform distribution of the parameters is the subject of recently published
research [1–3]. The present paper deals with the problem of the gas flow ahead of the forward point of a blunt body moving
at supersonic speed in air with variable parameters. The chemical reaction processes behind the shock front are taken into
account. As a result of numerical calculations by the method of characteristics with isolation of the forward shock the time-dependent
position of the shock front and the distributions of the composition and gas dynamic parameters in the shock layer are found.
Translated from Izvestiya Akademii Nauk SSSR, Mekhanika Zhidkosti i Gaza, No. 6, pp. 170–172, November–December, 1986. 相似文献
20.
A. D. Kosinov Y. G. Ermolaev N. V. Semionov 《Journal of Applied Mechanics and Technical Physics》1999,40(5):858-864
Nonlinear evolution of high-amplitude periodic disturbances in a boundary layer on a flat plate for Mach numberM=2 is studied. An anomalous downstream evolution of the disturbances is found, quasi-two-dimensional disturbances being most
unstable. The obtained phase velocities of the waves are 30–40% greater than the phase velocities of the Tollmien-Schlichting
waves. The nonlinear evolution of vortex waves is accompanied by an increase in steady disturbances from the source of controlled
vibrations. High-frequency disturbances decay, and a periodic wave train degenerates downstream into a quasiharmonic wave
train.
Institute of Theoretical and Applied Mechanics, Siberian Division, Russian Academy of Sciences, Novosibirsk 630090. Translated
from Prikladnaya Mekhanika i Tekhnicheskaya Fizika, Vol. 40, No. 5, pp. 91–98, September–October, 1999. 相似文献