The aerodynamics of a set of two-dimensional elliptic cylinders with eccentricity of 0.8 and 0.6 is studied experimentally during the organised wake condition. The dynamic calibration of the transducer used for measurement of fluctuating pressures is described in detail. The data on Strouhal number, unsteady pressures and wake geometry are presented as a function of angle of attack during static condition of the models. The effect of Reynolds number on the fluctuating pressure is also examined. The results indicate dependence of the unsteady forces on Reynolds number at zero angle of attack. Basing the Strouhal number on projected width appears to reduce its dependence on the angle of attack of the models. The existence of a large phase angle between the fluctuating pressures is of interest. The wake geometry study indicates a gradual reduction in the ratio of the lateral to the longitudinal spacing with increase in angle of attack. / Applied Science, Faculty of / Mechanical Engineering, Department of / Graduate

published_or_final_version / Civil Engineering / Doctoral / Doctor of Philosophy

published_or_final_version / Civil Engineering / Doctoral / Doctor of Philosophy

published_or_final_version / Civil Engineering / Doctoral / Doctor of Philosophy

published_or_final_version / Civil Engineering / Master / Master of Science in Engineering

published_or_final_version / Civil Engineering / Doctoral / Doctor of Philosophy

Sea level and the alongshore component of wind stress data at seven locations on the Pacific coast of Canada and the United States were analyzed. The effective data period was from August 1, 1973 to September 9, 1975. The seven locations were Tofino, British Columbia; Neah Bay and Toke Point, Washington; South beach (Newport) and Charleston, Oregon; and Crescent City and San Francisco, California. Sea level relative to the two year mean is higher at the northern locations during the winter months than it is at the southern stations. There appears to be an annual cycle in the sea level though the amplitudes are different for the two years. The monthly mean wind stress is northward during the winter months, and has a larger value at the northern locations. During the spring and summer the monthly mean wind stress is southward and has a larger value at the southern stations. Linear correlation analysis was performed on the sea level data and on the alongshore component of wind stress for the entire time period and seasonally. Auto-correlations and cross correlations were computed for the adjusted sea levels and wind stress. This analysis shows that the sea level and wind stress fluctuations among these seven locations are coherent. These show that the correlation is a function of location and that it has a seasonal variation. It also appears that by examining plots of correlation coefficients and of sea level slopes, that the region may be divided into two major regimes. This separation might be interpreted as the locale where the West Wind Drift impinges on the coast. / Graduation date: 1978

Photocopy of typescript. / Digitized by Kansas Correctional Industries

Thesis--Ph. D., University of Hong Kong.

Thesis--Ph. D., University of Hong Kong. / Errata slip inserted. Mimeographed.