Title page for ETD etd-062399-131503


Type of Document Master's Thesis
Author Tian, Lin
Author's Email Address ltian@vt.edu
URN etd-062399-131503
Title Analysis of Time-Varying Characteristics of Simulated Turbulence in Wind Tunnel
Degree Master of Science
Department Engineering Mechanics
Advisory Committee
Advisor Name Title
Hajj, Muhammad R. Committee Chair
Ragab, Saad A. Committee Member
Tieleman, Henry W. Committee Member
Keywords
  • small-scale turbulence
  • atmospheric turbulence
  • wind loads
  • orthonormal wavelets
  • intermittency
Date of Defense 1999-05-28
Availability unrestricted
Abstract
Eight roughness configurations in Clemson boundary layer wind tunnel are presented. For these configurations, flow parameters such as turbulent intensities, integral length scales, large- and small- scale turbulence, and spectra of velocity components of the wind are obtained and studied to the simulated turbulence. At the same time, new analyzing tools, orthogonal wavelet techniques, are applied to provide additional information in time domain. This makes it possible to study the intermittency event, one important characteristic associated with pressure peak activities in turbulence. Three parameters, scale energy, intermittency factor and intermittency energy are defined. Variation of these quantities as a result of different configuration is discussed. Finally, the corresponding variations in measured pressure peaks in relation with the variations of configuration as well as with the intermittency parameters are investigated. The work here is of important significance for future wind tunnel and field data comparison, and this could help to find the best simulation among all configurations.
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