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Author: Farouk Owis
Publisher:
ISBN:
Category : Acoustical engineering
Languages : en
Pages : 322
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Book Description
Author: Farouk Owis
Publisher:
ISBN:
Category : Acoustical engineering
Languages : en
Pages : 322
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Book Description
Author: Christophe Brun
Publisher: Springer Science & Business Media
ISBN: 3540899561
Category : Technology & Engineering
Languages : en
Pages : 344
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Book Description
Large Eddy Simulation (LES) is a high-fidelity approach to the numerical simulation of turbulent flows. Recent developments have shown LES to be able to predict aerodynamic noise generation and propagation as well as the turbulent flow, by means of either a hybrid or a direct approach. This book is based on the results of two French/German research groups working on LES simulations in complex geometries and noise generation in turbulent flows. The results provide insights into modern prediction approaches for turbulent flows and noise generation mechanisms as well as their use for novel noise reduction concepts.
Author:
Publisher: DIANE Publishing
ISBN: 1428995218
Category :
Languages : en
Pages : 47
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Author: Bendiks J. Boersma
Publisher:
ISBN:
Category :
Languages : en
Pages : 8
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Book Description
In this paper we will investigate the sound field of a round turbulent jet with a Mach number of 0.6 based on the jet centerline velocity and the ambient speed of sound. The sound field is obtained by solving a wave equation for the acoustic field. Two different acoustic source terms are used as right hand side of the wave equation. One in which the source term is given by traditional Light hill stress tensor and a second one in which the source term is based on the vorticity in the fluid.
Author: Ram Mohan Rao
Publisher:
ISBN:
Category :
Languages : en
Pages : 264
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Author: André M. Hall
Publisher:
ISBN:
Category : Computational fluid dynamics
Languages : en
Pages : 66
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Book Description
The goal of this effort has been to identify the dominant source of the radiated aero-acoustic noise produced by high-speed, heated jets and develop control strategies to reduce it. To that end, two acoustically matched Mach 0.6 jets, at temperature ratio Tr=O.93 (cold) and Tr=1.7 (hot) are examined. The use of non-intrusive Particle Image Velocimetry (PIV) to sample the flow, allowed a true measure of the velocity field to be realized without fear of corrupting the radiated noise field intrinsic to each jet. The low-order modal dominance of each was determined using Proper Orthogonal Decomposition (POD), highlighting the low-dimensional nature of this highly turbulent flow field.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 50
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Book Description
Author: S. H. Shih
Publisher:
ISBN:
Category : Jet planes
Languages : en
Pages : 16
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Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781722052225
Category :
Languages : en
Pages : 38
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Book Description
Aeroacoustic noise generation in a supersonic round jet is studied to understand in particular the effect of turbulence structure on the noise without numerically compromising the turbulence itself. This means that direct numerical simulations (DNS's) are needed. In order to use DNS at high enough Reynolds numbers to get sufficient turbulence structure we have decided to solve the temporal jet problem, using periodicity in the direction of the jet axis. Physically this means that turbulent structures in the jet are repeated in successive downstream cells instead of being gradually modified downstream into a jet plume. Therefore in order to answer some questions about the turbulence we will partially compromise the overall structure of the jet. The first section of chapter 1 describes some work on the linear stability of a supersonic round jet and the implications of this for the jet noise problem. In the second section we present preliminary work done using a TVD numerical scheme on a CM5. This work is only two-dimensional (plane) but shows very interesting results, including weak shock waves. However this is a nonviscous computation and the method resolves the shocks by adding extra numerical dissipation where the gradients are large. One wonders whether the extra dissipation would influence small turbulent structures like small intense vortices. The second chapter is an extensive discussion of preliminary numerical work using the spectral method to solve the compressible Navier-Stokes equations to study turbulent jet flows. The method uses Fourier expansions in the azimuthal and streamwise direction and a 1-D B-spline basis representation in the radial direction. The B-spline basis is locally supported and this ensures block diagonal matrix equations which are solved in O(N) steps. A very accurate highly resolved DNS of a turbulent jet flow is expected. Rao, Ram Mohan and Lundgren, Thomas S. Ames Research Center NCC2-5017; DAAL03-89-C-0038...
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 80
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