Control of Fluid Flow by Petros Koumoutsakos, Igor Mezic

By Petros Koumoutsakos, Igor Mezic

This conscientiously edited monograph provides the state-of-the-art of concept and functions in fluid movement keep watch over. It collects contributions through top specialists within the box of fluid move keep an eye on fascinating for engineers, physicists, or mathematicians up to speed and fluid dynamics. "Control of Fluid circulation" covers quite a lot of contemporary issues together with vortex dependent regulate algorithms, incompressible turbulent boundary layers, aerodynamic movement keep watch over, keep watch over of combining and reactive stream strategies or nonlinear modeling and keep an eye on of combustion dynamics.

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The results from the parameter optimization are shown in Fig. 27. Here the non-dimensional reattachment length xR /xR0 is plotted against the excitation frequency as a function of two sweep angles and two amplitudes A = vrms /UN . The optimum excitation frequency is approximately 100 Hz, independent of sweep angle and amplitude, and close to the maximum excitation frequency of the Kelvin-Helmholtz instability. 128) the development of the reattachment length as a function of the amplitude vrms /UN shows a minimum at A = 85 % (for α∗ = 0◦ this value is practically identical).

8, 49–58. -H. & Quast, A. 1981 Widerstandsvermeidung durch Blasturbulatoren. Tech. Rep. FB 81–33. DFVLR. , Liu, C. F. & Shyu, J. Y. 1990 Control of wall-separated flow by internal acoustic excitation. AIAA J. 28, 1440–1446. -H. Fernholz and F. Urzynicok [30] Huang, L. , Bryant, T. D. & Maestrello, L. 1988 The effect of acoustic forcing on trailing edge separation and near wake development of an airfoil. AIAA Paper 88–3531-CP. [31] Huang, L. , Maestrello, L. & Bryant, T. D. 1987 Separation control over an airfoil at high angles of attack by sound emanating from the surface.

E. no vortex pairing Control of Weak and Strong Reverse-Flow Regions (a) 31 (b) Fig. 27. 018, α∗ = 20◦ ). From Huppertz & Fernholz [33] occurred [33]. 25. Figure 28 presents the development of Ecoh (u) in streamwise direction for α∗ = 20◦ and A = 25 % at four excitation frequencies (f = {51, 75, 102, 150} Hz) and a bandwidth of Δf = 4 Hz. Amplification, saturation and a decrease of the coherent energy can be observed. Each curve has a saturation value Ecohmax at a different height and at a different streamwise location x/h.

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