Book contents
- Frontmatter
- Contents
- Preface
- Nomenclature
- 1 Introduction
- 2 Governing Equations
- 3 Unifying Principles
- 4 Coherent Structures
- 5 Reynolds Number Effects
- 6 Transition Control
- 7 Compliant Coatings
- 8 Separation Control
- 9 Low-Reynolds-Number Aerodynamics
- 10 Drag Reduction
- 11 Mixing Enhancement
- 12 Noise Reduction
- 13 Microelectromechanical Systems
- 14 Frontiers of Flow Control
- Epilogue
- Bibliography
- Index
7 - Compliant Coatings
Published online by Cambridge University Press: 23 December 2009
- Frontmatter
- Contents
- Preface
- Nomenclature
- 1 Introduction
- 2 Governing Equations
- 3 Unifying Principles
- 4 Coherent Structures
- 5 Reynolds Number Effects
- 6 Transition Control
- 7 Compliant Coatings
- 8 Separation Control
- 9 Low-Reynolds-Number Aerodynamics
- 10 Drag Reduction
- 11 Mixing Enhancement
- 12 Noise Reduction
- 13 Microelectromechanical Systems
- 14 Frontiers of Flow Control
- Epilogue
- Bibliography
- Index
Summary
There is no greater impediment to progress in the sciences than the desire to see it take place too quickly.
(George Christoph Lichtenberg, 1742–1799)There is a river in the ocean: in the severest droughts it never fails, and in the mightiest floods it never overflows; its banks and its bottom are of cold water, while its current is of warm; the Gulf of Mexico is its fountain, and its mouth is the Arctic Seas. It is the Gulf stream. There is in the world no other such majestic flow of waters.
(Matthew Fontaine Maury, 1806–1873)PROLOGUE
Boundary layer manipulation via reactive control strategies is now in vogue. The payoffs are handsome, but the difficulties involved are daunting. This topic is deferred to the last chapter of the book. There are, however, much simpler alternatives to such sophisticated flow alteration devices, and the present chapter discusses one such alternative: passive compliant walls. We particularly review the important developments in the field of compliant coatings that took place during the past decade or so. During this period, progress in theoretical and computational methods somewhat outpaced that in experimental efforts. There is no doubt that compliant coatings can be rationally designed to delay transition and to suppress noise on marine vehicles as well as other practical hydrodynamic devices. Transition Reynolds numbers that exceed by an order of magnitude those on rigid-surface boundary layers can readily be achieved.
- Type
- Chapter
- Information
- Flow ControlPassive, Active, and Reactive Flow Management, pp. 120 - 149Publisher: Cambridge University PressPrint publication year: 2000