Read e-book online Bluff-Body Wakes, Dynamics and Instabilities: IUTAM PDF

By P. W. Bearman (auth.), Prof. Dr. Helmut Eckelmann, Prof. Dr. J. Michael R. Graham, Prof. Dr. Patrick Huerre, Prof. Dr. Peter A. Monkewitz (eds.)

ISBN-10: 3662004143

ISBN-13: 9783662004142

ISBN-10: 366200416X

ISBN-13: 9783662004166

Bluff-body wakes play an incredible position in lots of fluid dynamics difficulties and engineering functions. This publication supplies and updated account of modern effects bought within the examine of bluff-body wakes. Experimental, theoretical and numerical techniques are all comprehensively lined and in comparison. issues of specific curiosity contain hydrodynamic instability analyses, 3-dimensional trend formation difficulties, circulation regulate equipment, bifurcation analyses, numerical simulations and turbulence modelling. the most originality of thisvolume is that contemporary conceptual advances made to explain nonlinear phenomena often are placed to the try out on a classical challenge in basic fluid mechanics, particularly the wake constitution generated in the back of a bluff object.

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New PDF release: Bluff-Body Wakes, Dynamics and Instabilities: IUTAM

Bluff-body wakes play a big position in lots of fluid dynamics difficulties and engineering functions. This publication supplies and updated account of contemporary effects acquired within the examine of bluff-body wakes. Experimental, theoretical and numerical ways are all comprehensively coated and in comparison. subject matters of specific curiosity contain hydrodynamic instability analyses, third-dimensional development formation difficulties, movement regulate equipment, bifurcation analyses, numerical simulations and turbulence modelling.

Additional resources for Bluff-Body Wakes, Dynamics and Instabilities: IUTAM Symposium, Göttingen, Germany September 7–11, 1992

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Durand). p. 308. Leipzig: Springer Verlag. 2. OHASHI H. AND ISHIKAWA N. 1972 Visualization study of a now near the trailing edge of an oscillating airfoil. Bulletin 0/ the Japanese Society 0/ Mechanical Engineers 15. 840·845. 3. KOOCHESFAHANI M. 1989 Vorticai patterns in the wake of an oscillating airfoil. AIAA Journal 27,1200·1205. 4. TRIANTAFYLLOU G. • KUPFER K. AND BERS A. 1987 Absolute instabilities and self· sustained oscillations in the wakes of circular cylinders. Physical Review Lellers 59.

Pattern 1 Fig. 1 Two patterns of flow around two circular cylinders of same diameter; pattern 1 : reattaching flow, pattern 2: vortex-sheddingflow. u... 18 Fig. 2 Sample record of pressure fluctuation at time-mean rear stagnation point of upstream cylinder PI. 47 . Fig. s as functions of Reynolds number for main flow without turbulence-generating grid. " 4 0 {; ~ {; 0 ..? 855. sld and different symbols for different experimental runs. , \.. 0 0 • \• \ 10- 2 • 3 0 ~ i A • .......... 8 "" . '::;)8 0 A Re ..

Hence at this frequency optimal efficiency is obtained. e. maximum thrust per unit input energy. 35. Experiments confirm this result, while the analysis of a large number of data from observations on fish and cetaceans confirm that optimal fish propulsion is achieved within this range of Strouhal number. Introduction An oscillating foil (heaving and/or pitching) moving with forward speed produces thrust under certain conditions. The generation of steady thrust is associated with the formation of an average velocity profile behind the foil which has the form of a jet.

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Bluff-Body Wakes, Dynamics and Instabilities: IUTAM Symposium, Göttingen, Germany September 7–11, 1992 by P. W. Bearman (auth.), Prof. Dr. Helmut Eckelmann, Prof. Dr. J. Michael R. Graham, Prof. Dr. Patrick Huerre, Prof. Dr. Peter A. Monkewitz (eds.)


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