Numerical Analysis of Fluiddynamic Instabilities and Pressure Fluctuations in the Near Field of a Detonation

2009 ◽  
pp. 239-259 ◽  
Author(s):  
Arno Klomfass
Keyword(s):  
Numerical Analysis ◽  
Near Field ◽  
Pressure Fluctuations

Optical near field scattered by surface defects: Two-dimensional numerical analysis

1997 ◽  
Vol 4 (1) ◽  
pp. 228-231 ◽  
Author(s):  
Shu Wang ◽  
Mufei Xiao
Keyword(s):  
Numerical Analysis ◽  
Surface Defects ◽  
Near Field ◽  
Two Dimensional

Numerical analysis of micro-aperture laser for near field optical data storage

2002 ◽  
Author(s):  
Xiaojin Jiao ◽  
Yonghua Lu ◽  
Hai Ming ◽  
Jiangping Xie
Keyword(s):  
Numerical Analysis ◽  
Data Storage ◽  
Near Field ◽  
Optical Data Storage ◽  
Optical Data

The Study on Automobile Electronic Key Systems using Numerical Analysis

2012 ◽  
Vol 490-495 ◽  
pp. 1655-1658
Author(s):  
Xu Song Sun
Keyword(s):  
Magnetic Field ◽  
Numerical Analysis ◽  
Near Field ◽  
Automobile Electronic

Paper was removed due to verbatim plagiarism. The original paper was published as follows: Sugahara, K.; Yamamoto, H..; Ouchi, H..; Nakano, Y.., "Numerical Analysis of Near-Field Magnetic Field for Automobile Electronic Key Systems," Magnetics, IEEE Transactions on , vol.43, no.8, pp.3375,3379, Aug. 2007 http://ieeexplore.ieee.org/xpls/icp.jsp?arnumber=4277913

On the hydrodynamic and acoustic nature of pressure proper orthogonal decomposition modes in the near field of a compressible jet

2017 ◽  
Vol 836 ◽  
pp. 998-1008 ◽  
Author(s):  
Matteo Mancinelli ◽  
Tiziano Pagliaroli ◽  
Roberto Camussi ◽  
Thomas Castelain
Keyword(s):  
Proper Orthogonal Decomposition ◽  
Time Pressure ◽  
Near Field ◽  
Pressure Fluctuations ◽  
Orthogonal Decomposition ◽  
Spectral Energy ◽  
Far Field ◽  
Turbulent Structures ◽  
Proper Orthogonal ◽  
Compressible Jet

In this work an experimental investigation of the near-field pressure of a compressible jet is presented. The proper orthogonal decomposition (POD) of the pressure fluctuations measured by a linear array of microphones is performed in order to provide the streamwise evolution of the jet structure. The wavenumber–frequency spectrum of the space–time pressure fields re-constructed using each POD mode is computed in order to provide the physical interpretation of the mode in terms of hydrodynamic/acoustic nature. Specifically, non-radiating hydrodynamic, radiating acoustic and ‘hybrid’ hydro-acoustic modes are found based on the phase velocity associated with the spectral energy bumps in the wavenumber–frequency domain. Furthermore, the propagation direction in the far field of the radiating POD modes is detected through the cross-correlation with the measured far-field noise. Modes associated with noise emissions from large/fine scale turbulent structures radiating in the downstream/sideline direction in the far field are thus identified.

Numerical Analysis of Shockwave Propagation in Urban Underpass

2012 ◽  
Vol 13 (2) ◽  
pp. 201-207
Author(s):  
Xin Li ◽  
Zhihua Wang ◽  
Guiying Wu
Keyword(s):  
Numerical Simulation ◽  
Numerical Analysis ◽  
Traffic Congestion ◽  
Traffic Accidents ◽  
Peak Pressure ◽  
Near Field ◽  
Horizontal Direction ◽  
Pressure Distributions ◽  
Blast Effects ◽  
Potential Damage

Abstract As an indispensable part of transportation system, urban underpass can alleviate traffic congestion and reduce traffic accidents effectively. In order to acquaint the hydrodynamics of shockwave in underpass and assess the potential damage and risk of bombing accidents, a numerical simulation was established to calculate the blast effects originating from the 13Kg TNT. Based on the location of detonation point, the shape of corridor section and the exit's cover, peak pressure distributions were predicted. The results indicate that the propagation of shockwave in horizontal direction switches to the inclined top of ground in a near-field due to the ground reflection and the set of exit's cover increases the risk of explosion to the structure and the users.

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