Journal of Wind Engineering
Online ISSN : 1349-340X
Print ISSN : 1349-3507
ISSN-L : 1349-340X
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Volume 26, Issue 3
[No. 88]
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Technical Paper
  • Effects of Space Average on Wind Fluctuations
    - in Relation to the Simulation of Multi-dimensional Wind Fluctuations -
    Yoshiharu IWATANI
    2001 Volume 26 Issue 3 Pages 88_131-88_141
    Published: 2001
    Released on J-STAGE: August 25, 2005
    DOIhttps://doi.org/10.5359/jwe.26.88_131
    JOURNAL FREE ACCESS
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    In the present paper we wish to propose a calculating method of power spectra and cross spectra of wind fluctuations averaged over a distance along a horizontal straight line in an arbitrary direction to mean wind direction and to show some results calculated according to the method. Examples of weighting functions related to space average, by which the original power spectra are cut off, are shown. When wind fluctuations are averaged over a distance, coherences between them at two different points usually become larger than the original ones. On the other hand, phase differences become smaller.
    A method for combining the effects of space average into a program for simulation of multi-dimensional wind fluctuations is proposed. The method simplifies the procedure of simulation of multi-dimensional space-averaged wind fluctuations, and is very convenient for practical use.
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