Type of Document Master's Thesis Author Al-Maaitah, Ayman Adnan URN etd-11152013-040410 Title Effect of roughness element on the stability of boundary layers Degree Master of Science Department Engineering Science and Mechanics Advisory Committee
Advisor Name Title Ali H. Nayfeh Committee Chair Saad A. Ragab Committee Co-Chair Dean A. Mook Committee Member Keywords
Date of Defense 1986-11-05 Availability restricted AbstractThe instability of flows around hump and dip imperfect1ons is invest1gated. The mean flow is calculated using interacting boundary
layers, thereby accounting for viscous/inviscid 1nteraction and separation bubbles. Then, the two-dimensional linear instability of this flow is analyzed, and the amplification factors are computed. Results are obtained for several height/width ratios and locations. The
theoretical results have been used to correlate the experimental results of Greening and Walker. The observed transition locations are found to
correspond to amplificat1on factors varying between 7.4 and 10, consistent with previous results for flat plates. The method accounts for Tol1mien—Schlichting waves, the shear layer instability, and their
interaction. Separation is found to increase significantly the amplification factor.
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