Read e-book online Advances in Turbulence 3: Proceedings of the Third European PDF

By James G. Brasseur, Wen-Quei Lin (auth.), Professor Arne V. Johansson, Professor P. Henrik Alfredsson (eds.)

ISBN-10: 3642843999

ISBN-13: 9783642843990

ISBN-10: 3642844014

ISBN-13: 9783642844010

The e-book covers the subsequent major themes: turbulence constitution, transition, dynamical structures in terms of transition, turbulent combustion and combining, turbulence stricken by physique forces, turbulence modeling, drag aid, and novel experimental suggestions. as well as 6 invited survey lectures the reader will locate good over 50 contributions via experts within the box. The ebook addresses researchers in physics, engineering, and numerical simulation.

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Read or Download Advances in Turbulence 3: Proceedings of the Third European Turbulence Conference Stockholm, July 3–6, 1990 PDF

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Additional resources for Advances in Turbulence 3: Proceedings of the Third European Turbulence Conference Stockholm, July 3–6, 1990

Example text

Turb. Shear Flows, Cornell. , Kupfer, K. & Bers, A. 1987 Absolute Instabilities and Self-Sustained Oscillations in the Wakes of Circular Cylinders, Pkys. Rev. Lett. 59,1914. F. & Rockwell, D. 1988 On Vortex Formation From a Cylinder. Part 1. The Initial Instability, J. Fluid Meek. 190, 491. S. Kachanov Institute of Theoretical and Applied Mechanics, Novosibirsk 630090, USSR The paper is devoted to a review of recent studies (mainly experimental ones) where a set of principle results on the problem of the generation, development and breakdown of specific nonlinear wave packets (coherent structures) in a transitional boundary layer were obtained~ These results are generalized and applied to the description of the developed turbulent boundary layer.

Validation of the numerically simulated wake based on comparisons t- 36 Fig. 2. Evolution of 2D wake flow. Passive mixing scalar. - - :> OJ - - - :< O. of shedding frequencies and base-pressure coefficients with those of experiments has been reported elsewhere (Grinstein, Boris & Griffin 1990). The spanwise perturbation of the transverse velocity at the inflow is a symmetric function of the spanwise variable z of the form cos(27rz/>"span). In response to this excitation, the centers and ends of the rollers are advanced in opposite streamwise directions, in such a way that the undulation of the rollers on one side of the wake has a 180 0 phase shift relative to that of the rollers on the other side.

The results obtained in work [6] led its authors to the two majn conclusions: (i) the mechanism of the LHS instability of the flow actually takes place in the K-regime of the boundary-layer transition (the same as in work [12] for the channel flow); however (ii) the generation of the flashes-spikes is not connected immediately with this mechanism. On the basis of a detailed analysis of the experimental and theoretical data a physical model of the development of the deterministic stages of the K-regime of the breakdown has been developed in [3].

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Advances in Turbulence 3: Proceedings of the Third European Turbulence Conference Stockholm, July 3–6, 1990 by James G. Brasseur, Wen-Quei Lin (auth.), Professor Arne V. Johansson, Professor P. Henrik Alfredsson (eds.)


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