Bluff-Body Wakes, Dynamics and Instabilities: IUTAM by P. W. Bearman (auth.), Prof. Dr. Helmut Eckelmann, Prof. Dr.

Bluff-Body Wakes, Dynamics and Instabilities: IUTAM by P. W. Bearman (auth.), Prof. Dr. Helmut Eckelmann, Prof. Dr.

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.)

Bluff-body wakes play a massive position in lots of fluid dynamics difficulties and engineering purposes. This ebook provides and updated account of contemporary effects got within the examine of bluff-body wakes. Experimental, theoretical and numerical techniques are all comprehensively lined and in comparison. themes of specific curiosity contain hydrodynamic instability analyses, third-dimensional trend formation difficulties, circulate keep an eye on tools, bifurcation analyses, numerical simulations and turbulence modelling. the most originality of thisvolume is that fresh conceptual advances made to explain nonlinear phenomena ordinarily are positioned to the try out on a classical challenge in primary fluid mechanics, specifically the wake constitution generated in the back of a bluff object.

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

Example text

AND BURGESS J. M. 1935 General aerodynamic theory: perfect nuids. In Aerodynamic Theory vol. II (cd. W. F. 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.

An impulsive start is assumed at time t = 0, and the initial condition for u is given by Ece et al. [6]. It is well known [3], [4] that once the boundary layer starts to develop local regions of strong outflow, computations in the Eulerian system are not able to cope with the severe gradients that occur as the flow focuses into a narrow spike just prior to the onset of eruption. The difficulty may be overcome by recasting the boundarylayer equations in terms of Lagrangian coordinates [3], [4], viz.

Through careful experiments [2], it has been possible recently to observe the narrow-band eruptions that are characteristic of boundary-layer separation at large Reynolds numbers. It may be noted, for example, that the principal mode of breakdown (or bursting) of the turbulent wall layer is due to such tightly focussed eruptions that lead to the production of new hairpin vortices [2]. In most circumstances, separation takes place as a particular fluid particle is compressed to zero thickness in the streamwise direction, thereby giving rise to a "spike-like" response in the displacement surface [3]; furthermore the most commonly observed situation is one in which the separation is moving in a direction opposite to 24 the local mainstream at the instant of the eruption.

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