Publication Date:
2022-05-26
Description:
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.
Description:
Funding was provided by the Minerals Management Service under contract Number 14-12-0001-30262;
Sea Grant under contract Number NA86AA-D-FG090; and the Office of Naval Research
Young Investigator Program under contract
Number N00014-86-K-0579.
Keywords:
Hydraulic models
;
Turbulence
Repository Name:
Woods Hole Open Access Server
Type:
Technical Report
Format:
application/pdf
Permalink
