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 an incredible position in lots of fluid dynamics difficulties and engineering purposes. This booklet offers and up to date account of modern effects acquired within the examine of bluff-body wakes. Experimental, theoretical and numerical techniques are all comprehensively lined and in comparison. subject matters of specific curiosity contain hydrodynamic instability analyses, three-d trend formation difficulties, stream regulate tools, bifurcation analyses, numerical simulations and turbulence modelling. the most originality of thisvolume is that fresh conceptual advances made to explain nonlinear phenomena in most cases are placed to the attempt on a classical challenge in basic fluid mechanics, specifically the wake constitution generated at the back of a bluff object.
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Additional info for Bluff-Body Wakes, Dynamics and Instabilities: IUTAM Symposium, Göttingen, Germany September 7–11, 1992
One is for smaller twbulence intensities, and the other is for higher twbulence intensities. The former might be affected by the residual twbulence in the wind tunnel. This was because the autocorrelation function of the longitudinal velocity fluctuation (not shown) had a long tail for the smaller twbulence intensities. The long tail is expected to be associated with low-frequency distwbances in the wind tunnel. On the other band, the autocorrelations for the higher intensities had no such a long tail; that is, the grid-generated twbulence counteracted the residual twbulence.
Then the tunnel was operated to study the pattern-switching property at the same distance. By this procedure the flow was expected to lose its memory about its previous patterns. Figure 2 shows a sample of time histories of the pressure fluctuation at the rear stagnation point of the upstream cylinder Pl' Pattern 1 and pattern 2 are associated with time intervals in which the pressure fluctuation p, is quiet and violent, respectively. The time intervals during which pattern 1 or pattern 2 is recorded is denoted by t, or t2• and the fraction of time for pattern I or pattern 2 is denoted by y, and Y2' In the present study the distance 1 10 .
It can be seen that as aspect ratio is reduced below about 8, C'L increases by as much as 50%. Even with end plates there is still some three-dimensional disturbance introduced into the flow but any strong mean cross flow near the ends is eliminated. At high Reynolds numbers there are unsteady pressure gradients imposed along the span, as evidenced by vortex shedding not being in phase over large spanwise distances. The unsteady cross flows induced by these pressure gradients are suppressed near an end plate and this seems to lead to an enhancement in the mean strength of the shed vortices in this region.