Browsing by Author "Bouwmeester, R. J. B., author"
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Item Open Access Preliminary measurements of flow over model, three-dimension hills(Colorado State University. Libraries, 1978-03) Meroney, Robert N., author; Sandborn, Virgil A., author; Chien, Ho-Chen, author; Bouwmeester, R. J. B., author; College of Engineering, Colorado State University, publisherItem Open Access Sites for wind power installations: wind tunnel simulation of the influence of two-dimensional ridges on wind speed and turbulence -- tabulated experimental data(Colorado State University. Libraries, 1976) Meroney, Robert N., author; Sandborn, V. A., author; Bouwmeester, R. J. B., author; Rider, M. A., author; Fluid Mechanics & Wind Engineering Program, Civil Engineering Department, Colorado State University, publisherItem Open Access Sites for wind power installations: wind tunnel simulation of the influence of two-dimensional ridges on wind speed and turbulence: annual report, first year(Colorado State University. Libraries, 1976) Meroney, R. N., author; Sandborn, V. A., author; Bouwmeester, R. J. B., author; Rider, M. A., author; Fluid Mechanics and Wind Engineering Program, Civil Engineering Department, Colorado State University, publisherItem Open Access Sites for wind power installations: wind tunnel simulation of the influence of two-dimensional ridges on wind speed and turbulence: draft final report, second year(Colorado State University. Libraries, 1977-07) Meroney, Robert N., author; Sandborn, V. A., author; Bouwmeester, R. J. B., author; Rider, M. A., author; Fluid Mechanics and Wind Engineering Program, Civil Engineering Department, Colorado State University, publisherWind tunnel studies of optimum sites for wind power turbines were made. A systematic evaluation of the flow over two-dimensional ridges is reported. Two-dimensional ridges with definite crests, such as ideal triangular or sinusoidal shapes, produce the greatest amplifications in local wind speed. Bluff, very steep and flat topped ridges do not produce as large an increase in velocity as the crest ridges. The ridges tested were of small characteristic size compared to the boundary layer thickness. The models correspond to ridges of the order of 100 meters or less in the atmosphere. For these ridges it is found that local viscous effects are of second order and the speedup of velocity can be predicted by inviscid flow considerations. Only near the surface (corresponding to approximately one to two ridge heights) are large changes in velocity observed. Wind velocity increases of the order of two times or greater than that of the approach velocity are measured at the crest of the triangular ridge. A slope of 1 to 4 (14 degrees) for the triangular ridge gives the optimum speedup at the crest. The flow in the outer region of the boundary layers over the ridge was found to remain similar to the flow upstream of the ridge. The longitudinal turbulent velocity component was found to decrease slightly near the ridge surface as the flow progressed over the windward face of the ridge. The vertical turbulent velocity component increased slightly along the windward face of the ridge. The variation in turbulent velocities over the windward face of the ridge correspond to effect of a contraction on isotropic turbulence.Item Open Access Sites for wind-power installations: physical modeling of the influence of hills, ridges and complex terrain on wind speed and turbulence(Colorado State University. Libraries, 1978-06) Meroney, Robert N., author; Sandborn, Virgil A., author; Bouwmeester, R. J. B., author; Chien, H. C., author; Rider, M., author; Fluid Mechanics and Wind Engineering Program, Civil Engineering Department, Colorado State University, publisherWind-tunnel model measurements have been performed to study the influence of topography profile, surface roughness and stratification on the suitability of various combinations of these variables for wind-power sites. For the range of examined cases (large turbulence integral scales with respect to surface feature scales) the flow is dominated by inviscid dynamics. Hence, the influence of hill shape, surface roughness, and mild stratification can be reliably estimated by simple prediction procedures for the range of situations considered (i.e., horizontal length scales of the order of 1000 meters). Detailed tables of velocity, turbulence intensity, pressure, spectra, etc., have been prepared to guide numerical model design and experimental rule of thumb constrictions. Cases include hill slopes from 1:2 to 1:20, neutral and stratified flows, two- and three-dimensional symmetric ridges, six alternate hill and escarpment shapes, and a variety of windward versus leeward slope combinations to evaluate ridge separation characteristics. In addition, one comparison program over complex terrain consisting of both field and laboratory measurements has been completed. The final product of this investigation is a summary of criteria to be satisfied for potential sites. Included was validation that certain criteria are satisfied which ensure similitude between the laboratory experiment and the atmospheric situation being modeled. The laboratory data were verified by comparison with field measurements in a well documented case of flow over known terrain. Emphasis was placed on effects of surface layer separation and topography scales larger than turbulence integral scales, i.e., hills small with respect to atmospheric surface layer depth.Item Open Access Sites for wind-power installations: wind characteristics over ridges. Part I(Colorado State University. Libraries, 1978-06) Bouwmeester, R. J. B., author; Meroney, R. N., author; Sandborn, V. A., author; Fluid Dynamics and Diffusion Laboratory, Department of Civil Engineering, Colorado State University, publisher