Turbulent drag reduction by nonplanar surfaces - A survey on the research at TU/DLR Berlin
Abstract
The use of riblets for drag reduction is examined theoretically. For various riblet shapes, the anisotropic properties of the viscous flow over the riblets are determined. The results obtained can be used for riblet optimization and as input data for computer simulations of the complete turbulent flow field. Attention is also given to other concepts, such as hypothetical mechanisms derived from observations of the shark skin. The experimental facilities that would be required to test these new concepts are discussed.
- Publication:
-
Structure of Turbulence and Drag Reduction
- Pub Date:
- 1990
- Bibcode:
- 1990stdr.proc..525B
- Keywords:
-
- Drag Reduction;
- Riblets;
- Surface Geometry;
- Turbulent Flow;
- Viscous Flow;
- Cross Flow;
- Reynolds Number;
- Fluid Mechanics and Heat Transfer