Propagation of pressure waves in a gas-liquid medium with a cluster structure

Propagation of a stepwise shock wave in a liquid containing spherical gas-liquid clusters is experimentally studied. Measured results are compared with available theoretical models. It is shown that resonant interaction of gas-liquid clusters in the wave can increase the amplitude of oscillations in the shock wave. __________ Translated from Prikladnaya Mekhanika i Tekhnicheskaya Fizika, Vol. 46, No. 3, pp. 50–60, May–June, 2005.     

Shock Wave Structure in a Weakly Ionized Ion Plasma Containing Charged Particles

The shock wave structure in a three-component weakly ionized plasma containing fine metal particles (macroparticles) is considered. The particles are ionized due to thermionic emission and the ejected electrons adhere to molecules of the neutral carrier gas assumed to be electronegative. The resulting ion plasma contains charged components with sharply different masses which are differently decelerated in the shock wave. This leads to charge separation and the generation of self-consistent electric fields which in turn affect the motion of the charged components.__________Translated from Izvestiya Rossiiskoi Academii Nauk, Mekhanika Zhidkosti i Gaza, No. 3, 2005, pp. 179–188.Original Russian Text Copyright © 2005 by Bityurin and Klyuchnikov     

Asymptotic Investigation of the Thin Viscous Shock Layer Equations in the Neighborhood of the Stagnation Point for Low Reynolds Numbers

Hypersonic three-dimensional viscous rarefied gas flow past blunt bodies is investigated in the neighborhood of the stagnation point. The problem of applicability of the model of a thin viscous shock layer to the regime of transition from continuum to free-molecular flow is considered. In [1], it was shown that at low Reynolds numbers three hypersonic flow regimes can be distinguished and one of those regimes was investigated. In the present study an asymptotic solution of the thin viscous shock layer equations is obtained for another flow regime. With decrease in the Reynolds number the heat transfer coefficient determined by the solution obtained approaches its free-molecular value and the friction coefficient approaches its free-molecular limit, provided that the shock layer thickness is small. The analytical solution is compared with a numerical solution and the results of calculations based on direct Monte Carlo simulation.     

3-D DYNAMIC RESPONSE OF TRANSVERSELY ISOTROPIC SATURATED SOILS

Introduction Thedynamicanalysisofsaturatedporoelasticmediaisofbroadmeaninginmanyaspectssuchasseismology,earthquakeengineering,soilmechanicsandgeophysics,etc.Thetransverselyisotropicsaturatedsoilsissolid fluidcoupledtwophasemediainwhichthe soilskeletondisp…     

应力波传播规律研究中的一种快速分析方法

本文提出了一种能快速、简便、直观地分析了应力波传播状况的方法。该方法利用可视化计算并绘制流前图，而后将其与动光弹条纹图相比较，进而利用所推导的应力波迭加分析式判断出物体边界或其内部的应力波迭加效果。文中对圆盘中的几个典型区域进行了实例分析。     

对称表面动载下有限块体的破裂过程

实验表明,受对称布置的表面爆炸载荷的脆性块体,会在通过载荷作用点连线的某一平面上破裂。为解释这一现象并进一步探讨利用类似方法破碎岩块的可能性,本文介绍了应用弹性动力学理论建立的计算模型以及所进行的动光弹和混凝土块模型试验。研究结果表明:在所述载荷条件下,应力波特别是自由界面反射的拉伸波对块体的破碎起重要作用;由于多向拉应力集中,在块体加载端面梭边中部最易产生径向裂隙,此后在侧面反射波的作用下裂隙延伸,与中部可能存在的裂纹贯通,从而将块体破开;对称加载使应力波在块体内多次叠加有利于块体充分破碎。     

Cubically Nonlinear Waves in a Piezoelastic Material

The paper proposes a new deformation model of piezomaterials that includes linear, quadratic, and cubic, and piezoeffect mechanisms. A nonlinear system of equations describing the propagation of plane waves is derived. Two new problems are solved analytically: generation of the third harmonic of an SH-wave and generation and interaction of new SH- and SV-waves after SH- and SV-waves are excited. All data needed for computer modeling are determined. The results of computer modeling are discussed     

Numerical investigation of the propagation of shock waves in rigid porous materials: flow field behavior and parametric study

A numerical parametric study of the flow field which develops when a planar shock wave impinge on a rigid porous material is presented. This study complements an earlier study (Levy et al. 1996a) where the values of some dominating parameters were estimated and the dependence of the resulting flow field on these values was not checked. Received 22 April 1996 / Accepted 5 January 1997     

Boussinesq方程的发展形式与Airy波理论差异性研究

应用势流理论，采用递推函数方法推导出一个新形式的Ｂｏｕｓｉｎｅｓｑ方程。通过对新方程的参数设置，可以讨论出Ｂｏｕｓｓｉｎｅｓｑ方程发展趋势和不同的发展形式。对浅水波动的描述方程，Ｂｏｕｓｓｉｎｅｓｑ方程的发展趋势为适用水深范围的拓展。拓展应用范围的大小则由其方程频散特征向Ａｉｒｙ波频散解逼近程度来决定。而Ｂｏｕｓｉｎｅｑ方程又不同于Ａｉｒｙ波，主要原因是Ｂｏｕｓｓｉｎｅｓｑ方程中含有线性频散项，Ａｉｒｙ波则只是长波首项近似，无线性频散项。其频散特征为精确的线性频散解。对实际水波传播而言，Ａｉｒｙ波理论的局限性是不言而喻的。     

APPROXIMATE FORMULASOF IMPACT FORCE FOR NORMAL IMPACT OF A FINITE ELASTIC BEAM OF ELASTIC FOUNDATION BY A FINITE ROD

ＲｅｎＷｅｎｍｉｎ（任文敏）；ＨｕａｎｇＪｉａｎｍｉｎ（黄剑敏）；ＣｈｅｎＷｅｎ（陈文）（ＲｅｃｅｉｖｅｄＤｅｃ．２５，１９９４；ＣｏｍｍｕｎｉｃａｔｅｄｂｙＹａｎｇＧｕｉｔｏｎｇ）ＡＰＰＲＯＸＩＭＡＴＥＦＯＲＭＵＬＡＳＯＦＩＭＰＡＣＴＦＯＲＣＥＦＯ...