Numerical study of wave propagation in a non-uniform flow Download PDF EPUB FB2
Numerical Study of Wave Propagation in a Non-uniform Flow Alex Povitsky ICASE, Hampton, Virginia Institute for Computer Applications in Science and Engineering NASA Langley Research Center Hampton, VA Operated by Universities Space Research Association September Prepared for Langley Research Center under Contract NAS The propagation of acoustic waves originating from cylindrical and spherical pulses in a nonuniform mean flow, and in the presence of a reflecting wall, is investigated by solving linearized Euler equations in terms of disturbances using high-order compact approximation of spatial derivatives.
The two-dimensional and three-dimensional stagnation flows and a flow around a cylinder are taken as Cited by: PDF | The propagation of acoustic waves originating from cylindrical and spherical pulses in a nonuniform mean flow, and in the presence of a reflecting | Find, read and cite all the research Author: Alex Povitsky.
Get this from a library. Numerical study of wave propagation in a non-uniform flow. [Alex Povitsky; Institute for Computer Applications in Science and Engineering.]. Numerical study of wave propagation in a nonuniform compressible ﬂow Alex Povitsky a) Department of Mechanical and Industrial Engineering, Concordia University, Montreal, Quebec.
CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): The propagation of acoustic waves originating from cylindrical and spherical pulses, in a non-uniform mean flow, and in the presence of a reflecting wall is investigated by Hardin and Pope approach using compact approximation of spatial derivatives.
The 2-D and 3-D stagnation ows and a flow around a cylinder are taken. NUMERICAL STUDY OF WAVE PROPAGATION IN A NON-UNIFORM FLOW. By Alex Povitsky. Abstract. The propagation of acoustic waves originating from cylindrical and spherical pulses, in a non-uniform mean flow, and in the presence of a reflecting wall is investigated by Hardin and Pope approach using compact approximation of spatial derivatives.
The 2-D. A numerical method for free-surface flow is presented to study water waves in coastal areas. The method builds on the nonlinear shallow water equations and utilizes a non-hydrostatic pressure term to describe short waves.
A vertical boundary-fitted grid is used Numerical study of wave propagation in a non-uniform flow book the water depth divided into a.
propagation of any potential detonation wave in this non-uniform mixture despite their relevance to safety concerns. Detonation propagation in a semi-confined flat layer filled with non-uniform hydrogen-air mixture with varying initial hydrogen pressures has.
The book presents the latest advances in numerical simulations of optical wave propagations in turbulent media.
The book is clearly written and abundant of excellent examples in MATLAB giving to the reader a lot of step-by-step introductions as well as understanding of the waves propagation.
The writing style is very s: 8. Numerical Simulation of Optical Wave Propagation is solely dedicated to wave-optics simulations. The book discusses digital Fourier transforms (FT), FT-based operations, multiple methods of wave-optics simulations, sampling requirements, and simulations in atmospheric turbulence.
This book will benefit optical scientists and engineers at all. In the present work we use a modified version of the weakly-compressible SPH scheme with diffusive terms described in Antuono et al.
 (hereinafter denoted by δ-SPH) to study the propagation of 2D gravity waves generated by a wave maker into a 2D wave basin.
In contrast with the numerical scheme proposed in , the present SPH scheme. This results in a general framework for the study of lumped mass matrices which can be employed in explicit time integration schemes with high-order accuracy. Numerical experiments are presented to demonstrate the applicability of the method to problems with smooth solutions as well as to wave propagation problems with reduced regularity.
This study investigates the effects of porosity variation on self-propagating high-temperature synthesis of Ti + 2B using numerical simulations. This study has shown that porosity variation influences the thermophysical/chemical parameters, such as thermal conductivity and density, and further changes the propagation manners of a combustion front.
Experimental and numerical study of shock wave propagation over cylinders and spheres A. Abe', K. Takayama', K. Itoh* * Shock Wave Research Center of Institute of Fluid Science, Tohoku University, Japan Kakuda Research Center, National Aerospace Laboratory, Japan Abstract This is a preliminary study of shock wave attenuation over arrays of.
Based on the numerical model, EOS, and the failure criterion, the influences of these factors on crack initiation and propagation will be investigated in the follows. Conclusions. This study emphasizes the role of stress wave loading on crack initiation and propagation during the initial stage of.
A comprehensive numerical study was carried out to investigate the unsteady cell-like structures of oblique detonation waves (ODWs) for a fixed Mach 7 inlet flow over a wedge of 30° turning angle.
developed for three-dimensional wave propagation have been built upon the potential flow theory. Using integral equation methods, highly accurate numerical models have been developed for wave propagation over varying bathymetry in shallow water and for wave-body interaction in deep water [3, 4, 5].
However, the potential flow assumption limits. We discuss the application of non-uniform rational B-splines (NURBS) in the scaled boundary finite element method (SBFEM) for the solution of wave propagation problems at rather high frequencies.
We focus on the propagation of guided waves along prismatic structures of constant isons are made between NURBS-based discretizations and high-order spectral.
A general numerical model study usually consists of the following components: Mathematical model is a simplified description of the geological problem, such as equations and boundary conditions. These governing equations of the model are often partial differential equations that are difficult to solve directly since it involves the derivative of the function, for example, the wave equation.
The ISSW26 focused on the following areas: Shock Propagation and Reflection, Detonation and Combustion, Hypersonic Flow, Shock Boundary Layer Interaction, Numerical Methods, Medical, Biological and Industrial Applications, Richtmyer Meshkov Instability, Blast Waves, Chemically Reacting Flows, Diagnostics, Facilities, Flow Visualisation.
The results of direct numerical simulations of the flow generated in a plane duct by a pressure gradient which is the sum of two terms are described. The first term of the pressure gradient is constant in space but it oscillates in time whereas the second term is constant both in space and in time.
Therefore, a pulsating flow is generated, similar to that generated at the bottom of a. 5) Sound propagation was affected by non-uniform flow to a large extent. When the noise problem caused by turbulent flow was numerically studied, therefore, the impact of such non-uniform shear flow should be taken seriously so as to obtain correct results.
Due immediately behind the barrier, where the flow is highly unsteady and nonuniform in the other, placed further downstream from the barrier, the flow approaches a steady and uniform state.
It is also shown that most of the attenuation experienced by the transmitted shock wave occurs in the zone where the flow is highly unsteady. A two-dimensional numerical model is developed to study the propagation of a solitary wave in the presence of a steady current flow.
The numerical model is based on the Reynolds-averaged Navier-Stokes (RANS) equations with a k-ε turbulence closure scheme and an internal wave-maker method. To capture the air-water interface, the volume of fluid (VOF) method is used in the numerical. Request PDF | On Dec 1,Fengru Wang and others published Practical Absorbing Boundary Conditions for Wave Propagation on Arbitrary Domain | Find, read.
In an effort to better understand the heating process in tissues with vascular structure we have developed a numerical simulation that couples models for ultrasound propagation, acoustic streaming, ultrasound heating and blood cooling in a Newtonian viscous medium.
The 3-D simulation allows for the study of complicated biological structures and. The swash of solitary waves on a plane beach is studied using large-scale experiments. Ten wave cases are examined which range from non-breaking waves to plunging breakers.
The focus of this study is on the influence of breaker type on flow evolution, spatiotemporal. Numerical Solution of Acoustic Propagation Problems Using Linearized Euler Equations. An integral formulation for wave propagation on weakly non-uniform potential flows. Journal of Sound and Vibration, Vol.
Effect of non-uniform mean flow field on acoustic propagation problems in computational aeroacoustics. 2 days ago wave propagation by k d prasad is universally compatible once any devices to read. Antennas and Wave Propagation-G.
Raju Antennas and Wave Propagation is written for the first course on the same. The book begins with an introduction that discusses the fundamental concepts, notations, representation and principles that govern the. Flood wave propagation is the unifying concept in representing open channel and overland flow.
Therefore, understanding flood wave routing theory and solving the governing equations accurately is an important issue in hydrology and hydraulics.A boundary element formulation is used in order to solve acoustic wave propagation in non-uniform potential subsonic mean flows.
An approach based on a Taylor--Lorentz variable transformation is. Propagation of wave formed due to back pressure changes by means of a choke is investigated.
In general, the reflection and transmission of pressure waves at intersection of conduits with different cross sections or in case of partial blockage typical of drilling practices is multidimensional and caused by nonuniform boundary conditions over.