Status of transition delay using compliant walls
Abstract
An account is given of the current understanding of drag-reduction phenomena associated with compliant walls for turbulence-transition delay in hydrodynamic boundary layer flows, first noted in connection with the achievement of anomalously high speeds by dolphins in virtue of the compliant character of their epidermis. Compliant walls may take the form of a slime layer-modified rigid wall, a passively compliant flexible wall, an active flexible wall, and a sensor-actuated flow-control active flexible wall. An order-of-magnitude increase in transitional Reynolds number, relative to rigid walls, is ultimately expected to be achieved.
- Publication:
-
Viscous Drag Reduction in Boundary Layers
- Pub Date:
- 1990
- Bibcode:
- 1990vdrb.rept...79C
- Keywords:
-
- Boundary Layer Transition;
- Delay;
- Drag Reduction;
- Wall Flow;
- Boundary Layer Flow;
- Fluid-Solid Interactions;
- Reynolds Number;
- Three Dimensional Flow;
- Turbulence Effects;
- Unsteady Flow;
- Fluid Mechanics and Heat Transfer