Journal of Wind Engineering
Online ISSN : 1349-340X
Print ISSN : 1349-3507
ISSN-L : 1349-340X
Volume 24 , Issue 3
[No. 80]
Showing 1-2 articles out of 2 articles from the selected issue
Technical Paper
  • Toshihiro WAKAHARA, Harry Yeh
    1999 Volume 24 Issue 3 Pages 80_65-80_73
    Published: 1999
    Released: December 14, 2005
    JOURNALS FREE ACCESS
    Spectral characteristics of wind-induced forces on rectangular column structures are analyzed for the frequency range higher than the spectral peak. The developed model is based on the assumptions that 1) ambient wind turbulence is fully developed and isotropic, and 2)dominant wind forces on the structure are caused by pressure fluctuations associated with the ambient turbulence. Using the Kolmogorov theory and length scales of effective pressure fluctuation, the power spectra of the transverse force on the column are found to be proportional to the frequency to the -10/3 power. The similar analysis leads to the result that the power spectra of the streamwise force are proportional to the frequency to the -4/3 power or -2/3 power, depending on the frequency range.
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  • Part 3, Simulation of Reynolds Stress Coefficient
    Shuyang CAO, Akira NISHI, Hiromori MIYAGI, Hironori KIKUGAWA, Yuji MAT ...
    1999 Volume 24 Issue 3 Pages 80_75-80_84
    Published: 1999
    Released: December 14, 2005
    JOURNALS FREE ACCESS
    In an Atmospheric Boundary Layer, turbulent shear stress or Reynolds stress is one of the most important factors to express the turbulent characteristics. In this study, the Reynolds Stress was simulated in an actively controlled turbulent wind tunnel, in which the turbulence was controllable. The Reynolds Stresses were reproduced in an uniform shear flow with grids (1), in a turbulent shear flow with grids (2), and in a turbulent flow by controlling both fans and airfoils (3). As the results showed, the Reynolds stress could be simulated with any one of these methods, however the obtained other turbulent parameters, such as integral scale and power spectrum were different for individual method. Moreover the transitions of the mean velocity, turbulent intensity, integral scale and power spectrum along the mean flow direction in the case of controlling the fans and airfoils were also examined.
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