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    The 17-meter flume at the Coastal Research Laboratory. Part II, Flow characteristics : technical report

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    WHOI-89-11.pdf (6.871Mb)
    Date
    1989-05
    Author
    Trowbridge, John H.  Concept link
    Geyer, W. Rockwell  Concept link
    Butman, Cheryl Ann  Concept link
    Chapman, Robert J.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/6413
    DOI
    10.1575/1912/6413
    Keyword
     Hydraulic models; Turbulence 
    Abstract
    This report summarizes the characteristics of the idealized one-dimensional turbulent channel flow for which the 17-Meter Flume was designed, and describes a measurement program designed to determine whether the flume can in fact produce such a flow. The measured quantities include mean velocities, Reynolds stresses, turbulence intensities and velocity spectra. Measured profiles of mean velocity, Reynolds stress and turbulence intensity are consistent with previous theoretical and empirical results. Measured spectra, although consistent with expectations over a wide range of frequencies, indicate a few unexpected features, including a constant spectral density at high frequencies (possibly due to aliasing or high-frequency noise) , motion at a few well-defined high frequencies of order 10 hz (possibly due to structual vibrations), oscillations with time scales of order 30 s (possibly due to low-mode standing surface waves) and irregular motions with time scales of several minutes (possibly due to fluctuations in pump performance) . The unexpected features indicated by the spectra at high and low frequencies do not have a significant effect on mean velocities and low-order statistics, but they may be important in some applications.
    Collections
    • Applied Ocean Physics and Engineering (AOP&E)
    • Coastal Ocean Institute and Rinehart Coastal Research Center
    • WHOI Technical Reports
    Suggested Citation
    Technical Report: Trowbridge, John H., Geyer, W. Rockwell, Butman, Cheryl Ann, Chapman, Robert J., "The 17-meter flume at the Coastal Research Laboratory. Part II, Flow characteristics : technical report", 1989-05, DOI:10.1575/1912/6413, https://hdl.handle.net/1912/6413
     
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