By S. Tardu, T. V. Truong, B. Tanguay (auth.), K. Krishna Prasad (eds.)

ISBN-10: 9401047456

ISBN-13: 9789401047456

ISBN-10: 9401117012

ISBN-13: 9789401117012

The thrust of contemporary examine on turbulence in fluids is anxious with coherent buildings and modelling. Riblets were proven to minimize drag, and the papers awarded during this quantity take on the most query of the mechanism liable for this behaviour in turbulent flow.
The contributions during this quantity have been offered on the 6th Drag aid assembly held at Eindhoven in the course of November 1991.
This quantity might be an invaluable reference paintings for engineers, physicists and utilized mathematicians attracted to the subject of fluid turbulence.

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Scaling of the bursting frequency in turbulent boundary layers. F. Fluid Mech. 132 (1983) 87. D. Thesis, Purdue University (1982). G. , Burst detection with single point measurements. J. Fluid Mech. 162 (1986) 389. G. , Characteristics of ejections in turbulent channel flow. J. Fluid Mech. 179 (1987) 179. G. , Bursts and ejections in a LEBU-modified boundary layer. , A new look at the near-wall structure. In: Matthieu, J. and Compte-Bellot, G. (eds), Berlin: Springer-Verlag (1986). , The wall pressure fluctuations of modified turbulent boundary layer with riblets.

The slow moving, quiescent fluid from the grooves emerges, either by the action of an outer vortical structure producing a strong ejection, (E1) or simply by being gradually displaced (E2) as other more energetic fluid enters elsewhere, the latter being the dominant outward flow feature in the sublayer. The flow rate in and out of the riblet grooves should be directly related to the balance of mean momentum and turbulence within them, and will therefore be related to the skin friction. Acknowledgments The work was supported by a grant from the UK Department of Trade and Industry.

To avoid problems with K and the empirical constants, the velocity profile of the viscous layer was used to obtain the friction velocity. y oU. o = v oy = oP P + y ox . 8 Palm and y+ velocity u*, ~ 239 5 the following relation is valid for the friction (8) In these expressions is the wall shear stress and p is the density. Combining equations (7) and (8) the following relation is obtained 'ro - u; (9) U=-y. v Although this method has the disadvantage of estimating the range of the viscous layer by eye, the error will be much smaller than the approximately 5% to 10% error of the other two methods.

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Further Developments in Turbulence Management by S. Tardu, T. V. Truong, B. Tanguay (auth.), K. Krishna Prasad (eds.)

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