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Issues in low-dimensional modeling of unsteady flows : convergence, asymptotic stability and reconstruction procedures /Sirisup, Sirod. January 2005 (has links)
Thesis (Ph.D.)--Brown University, 2005. / Vita. Thesis advisor: George Em Karniadakis. Includes bibliographical references (leaves 166-175). Also available online.
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Circulation methods in unsteady and three-dimensional flowsYuan, Jiankun. January 2002 (has links)
Thesis (Ph. D.)--Worcester Polytechnic Institute. / Keywords: Vortex; unsteady flow; circulation; three-dimensional flow; aerodynamics; instantaneous lift. Includes bibliographical references (p. 182-188).
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A numerical study of the Weis-Fogh mechanismSohn, Myonghan 08 1900 (has links)
No description available.
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An analytical method for the prediction of unsteady rotor/airframe interactions in forward flightMavris, Dimitri N. 08 1900 (has links)
No description available.
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Airloads on a finite wing in a time dependent incompressible freestreamGillam, David A. 08 1900 (has links)
No description available.
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Ordered and random structures in pulsatile flow through constricted tubesLieber, Baruch Barry 12 1900 (has links)
No description available.
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The prediction of unsteady three-dimensional aerodynamics on wind turbine bladesMunduate, Xabier. January 2002 (has links)
Thesis (Ph.D.) -- University of Glasgow, 2002. / Ph.D. thesis submitted to the Faculty of Engineering, Department of Aerospace Engineering, University of Glasgow, 2002. Includes bibliographical references. Print version also available.
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Flow visualization studies over a UCAV 1303 modelChua, Weng Heng. January 2009 (has links) (PDF)
Thesis (M.S. in Mechanical Engineering)--Naval Postgraduate School, June 2009. / Thesis Advisor(s): Chandrasekhara, M. S. "June 2009." Description based on title screen as viewed on July 10, 2009. Author(s) subject terms: Unsteady Aerodynamics, UCAV Maneuvers, 2D-unsteady flows. Includes bibliographical references (p. 43-44). Also available in print.
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An experimental and numerical investigation of a turbulent round jet issuing into an unsteady crossflow夏麗萍, Xia, Liping. January 1998 (has links)
published_or_final_version / Civil Engineering / Doctoral / Doctor of Philosophy
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Nonlinear interactions in mixing layers and compressible heated round jets.Jarrah, Yousef Mohd. January 1989 (has links)
The nonlinear interactions between a fundamental instability mode and both its harmonics and the changing mean flow are studied using the weakly nonlinear stability theory of Stuart and Watson, and numerical solutions of coupled nonlinear partial differential equations. The first part of this work focuses on incompressible cold (or isothermal; constant temperature throughout) mixing layers, and for these, the first and second Landau constants are calculated as functions of wavenumber and Reynolds number. It is found that the dominant contribution to the Landau constants arises from the mean flow changes and not from the higher harmonics. In order to establish the range of validity of the weakly nonlinear theory, the weakly nonlinear and numerical solutions are compared and the limitation of each is discussed. At small amplitudes and at low-to-moderate Reynolds numbers, the two results compare well in describing the saturation of the fundamental, the distortion of the mean flow, and the initial stages of vorticity roll-up. At larger amplitudes, the interaction between the fundamental, second harmonic, and the mean flow is strongly nonlinear and the numerical solution predicts flow oscillations, whereas the weakly nonlinear theory yields saturation. Beyond the region of exponential growth, the instability waves evolve into a periodic array of vortices. In the second part of this work, the weakly nonlinear theory is extended to heated (or nonisothermal mean temperature distribution) subsonic round jets where quadratic and cubic nonlinear interactions are present, and the Landau constants also depend on jet temperature ratio, Mach number and azimuthal mode number. Under exponential growth and nonlinear saturation, it is found that heating and compressibility suppress the growth of instability waves, that the first azimuthal mode is the dominant instability mode, and that the weakly nonlinear solution describes the early stages of the roll-up of an axisymmetric shear layer. The receptivity of a typical jet flow to pulse type input disturbances is also studied by solving the initial value problem and then examining the behavior of the long-time solution. The excitation produces a wave packet which consists of a few oscillations and is convected downstream by the mean flow. The magnitude of the disturbance in the jet depends on the location of the excitation and there is an optimum position at which little energy input will produce large perturbations. It is found that in order to generate the largest perturbations at any point in the jet, the disturbance should be deposited into the flow at a point where the phase velocity of the most amplified wave equals the fluid velocity (of the base flow).
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