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http://dx.doi.org/10.5050/KSNVN.2007.17.5.405

A Study on Turbulent Wall Pressure Fluctuations Using a Coherent Structure Model  

Ahn, Byoung-Kwon (Division of Aerospace Naval Architecture and Ocean Engineering, Chungnam National University)
Publication Information
Transactions of the Korean Society for Noise and Vibration Engineering / v.17, no.5, 2007 , pp. 405-414 More about this Journal
Abstract
In recent years, experimental and theoretical studies show that turbulent flows looking disordered have a definite structure produced repetitively with visible order. As a core structure of turbulence, hairpin vertices are believed to play a major role in developing and sustaining the turbulence process in the near wall region of turbulent boundary layers and may be regarded as the simplest conceptual model that can account for the essential features of the wall pressure fluctuations. In this work, fully developed typical hairpin vortices are focused and the associated surface pressure distributions and their corresponding spectra are estimated. On the basis of the attached eddy model, the overall surface pressure spectra are represented in terms of the eddy size distribution. The model is validated by comparison of predicted wavenumber spectra with existing empirical models, the results of direct numerical simulation (DNS) and also spatial correlations with experimental measurements.
Keywords
Turbulent Boundary Layer; Wall Pressure Fluctuations; Hairpin Vortex; Attached Eddy Model; Eddy Number Density; Wavenumber Spectrum; Spatial Correlation;
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