02142nam a2200241   450000500170000000800410001703500150005810000190007324500540009226000520014630000100019849000220020850001620023050200580039252011220045065000190157270000350159170000470162670000460167371000620171981000540178185600650183520260818171014.0200198         th                  eng    a.b104852111 aCheng, Kuo-pin10aOscillatory boundary layer flow above wavy bottom  aBangkok :bAsian Institute of Technology,c1977  a54 p.1 aThesis ;vno. 945  aA thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering of the Asian Institute of Technology, Bangkok, Thailand  aThesis (M.Eng.) - Asian Institute of Technology, 1977  aThe research reported. herein was conducted to study the characteristics of the velocity distribution and the vortex formation in the oscillatory  boundary layer above the wavy bottom. This study includes numerical calculation based on Navier-Stokes equation and the finite difference method. Numerical calculation technique proposed by Carl Pearson were developed to get the stream function, vorticity, and velocity distributions within the oscillatory boundary layer above the wavy bottom. Calculation were carried out for different conditions of flow and bottom roughness and results were compared with the experimental results for the corresponding case. It was concluded in this report that the horizontal and vertical velocity components are related to the magnitudes of the ·Reynolds, number and bottom roughness. The formation of the vortex around the ripple are  related strongly to Reynolds number and slightly to bottom roughness. For high Reynolds number case, the presence of large vortices distorts not only the vertical velocity but also the horizontal velocity within the  oscillatory boundary layer. 0aBoundary layer1 aWatanabe, Akira, eChairperson1 aArbhabhirama Anat, eExamination Committee0 a Prida Thimakorn, eExamination Committee2 aCarl Duisberg Gesellschaft (Germany), eScholarship Donor2 aAsian Institute of Technology.tThesis ;vno. 945  3Full-Textuhttp://203.159.5.9/ait-thesis/detail.php?q=B22688