By S. Tardu, T. V. Truong, B. Tanguay (auth.), K. Krishna Prasad (eds.)
The thrust of recent learn on turbulence in fluids is anxious with coherent buildings and modelling. Riblets were proven to lessen drag, and the papers offered 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 should be an invaluable reference paintings for engineers, physicists and utilized mathematicians attracted to the subject of fluid turbulence.
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Extra resources for Further Developments in Turbulence Management
17. 'Riblet induction'. 5. A conceptual model of tbe riblet sublayer The results discussed above provide further evidence that on a drag-reducing riblet surface, a region exists which may conveniently be referred to as the 'riblet sublayer'. Within this layer, the characteristics of the flow are significantly altered by the presence of the riblets and some flow features exist which are unique to the layer. These features are small in scale, and consist simply of interactions between the riblets and the flow configurations normally found in the near-wall layers of a turbulent boundary layer.
4. g. Choi (1989». 4mm, that is = 12. The turbulence intensity of the u velocity component and the distribution of turbulence shear stress u' v' are shown in Fig. 5, (a) and (b). Both figures cover the range y + ~ 200, to include the full logarithmic region. The origin in both these plots is the surface of the basic plate, and the variables are all reduced to non-dimensional form using the friction velocity u< on the plain surface. In Fig. 5(a) the peak in the u' profile shifts from y+ = 15 on the plain surface to y+ = 25 over the riblet surface, and the maximum value is reduced by 7%.
1991). Therefore, several methods were used to estimate the friction velocity for the smooth surface from the mean streamwise velocity profile and the respective results were compared with one another. One of the methods used here is the viscous layer method. Using this method for riblet surfaces, the virtual origin of the mean stream wise velocity profile can be estimated. The results of this method for the riblet surfaces were compared with the results of the methods of Choi, and Bechert and Bartenwerfer.
Further Developments in Turbulence Management by S. Tardu, T. V. Truong, B. Tanguay (auth.), K. Krishna Prasad (eds.)