Location of Repository

Numerical simulation of boundary-layer control using MEMS actuation

By Duncan A. Lockerby

Abstract

MEMS actuators and their effect on boundary layers is investigated using numerical simulation. The thesis is specifically focussed on jet actuators and their application to the targeted control of turbulent boundary layers.\ud \ud A complete numerical model of jet-type actuators, including the popular synthetic-jet actuator, is developed. The assumed input is the voltage signal to the piezocermic driver and the calculated output is the exit jet velocity. Thorough validation of the numerical code is presented and simulations performed to highlight the key issues in MEMS-actuator design.\ud \ud The three-dimensional boundary-layer disturbance created by the MEMS actuator is modelled using a velocity-vorticity formulation of the Navier-Stokes equations. The parallel code is rigorously validated against results from linear stability theory and transitional-streak measurements. The boundary-layer code is used to determine a performance criterion for MEMS jets; it is shown that the net mass flow from a jet best determines its effectiveness. The code is also used to demonstrate the macro-scale capabilities of MEMS-scale actuators; a grid-scaling method is described and employed to facilitate this calculation.\ud \ud A method is presented that enables high- and low-speed streaks to be modelled economically in otherwise undisturbed mean flows. Using this model, the fundamental principles of targeted control using MEMS actuation are explored.\ud \ud The MEMS-actuator and boundary-layer models are coupled, and an investigation into the interactive effects of the two systems is described. Using the coupled code, disturbances in the boundary layer are shown to induce velocities in inactive devices. One special case occurs when an oscillating pressure field creates Helmhotz resonance within the cavity of a MEMS actuator, thus causing large mass flow rates in and out of the device. It is also suggested that the MEMS device could strongly interact with the random fluctuations of a turbulent boundary layer, leading to highly unpredictable actuator responses

Topics: TK, TL
OAI identifier: oai:wrap.warwick.ac.uk:3076

Suggested articles

Preview

Citations

  1. 1.1975 An experimental investigation of the formation and development of a wave packet in a laminar boundary layer. doi
  2. 1.2000 Analysis of fluid flow and deflection for pressurebalanced MEMS diaphragm valves. Sensors and Actuators doi
  3. (1998). A large-scale control strategy for drag reduction in turbulent boundary layers. doi
  4. (1993). A mechanism for bypass transition from localized disturbances in wall-bounded shear flows. doi
  5. (1999). A nonlinear mechanism for receptivity of free-stream disturbances. doi
  6. (1980). A note on algebraic instability of inviscid parallel shear flows. doi
  7. (1999). A novel velocity-vorticity formulation of the Navier-Stokes: equations. pt. 1: mathematical and numerical methods with application to convective instabilities of the rotating-disk boundary layer.
  8. (1961). A single formula for the law of the wall. doi
  9. (1987). A study of hairpin vortices in a larninar boundary layer. Part 2. Hairpin vortices generated by fluid injection. doi
  10. (1975). A theoretical model of a wave packet in the boundary layer on a flat plate. doi
  11. (1999). Acoustic receptivity in boundary layers with surface roughness. doi
  12. (1978). Acoustic streaming J. Sound Vib. doi
  13. (1993). Active boundary layer control using flush-mounted surface actuators.
  14. (1996). Active control in the turbulent wall layer of a minimal flow unit. doi
  15. (1998). Active control of streamwise vortices and streaks in boundary layers. doi
  16. (1997). Active control of vortex-Nvall interactions. doi
  17. (1998). Active flow control applied to an airfoil. doi
  18. (1994). Active turbulence control for drag reduction in wall-bounded flows. doi
  19. (1987). Advances in Turbulence. doi
  20. (1998). Aerodynamic flow control using synthetic jet technology. doi
  21. Algebraic growth of disturbances in a larninar boundary layer. doi
  22. (1983). Analogies between transitional and turbulent boundary layers Phys. doi
  23. (1997). Application of neural networks to turbulence control for drag reduction. doi
  24. (2000). Changing lift and drag by jet oscillation: experiments on a circular cylinder with turbulent separation. doi
  25. (1991). Coherent motions in the turbulent boundary layer Annu. doi
  26. (1986). Coherent structures in a turbulent boundary layer. Part 1: generation of "artificial" bursts. doi
  27. (1997). Coupled fluid-structural characteristics of actuators for flow control. doi
  28. (1998). Development of a MEMS microvalve array for fluid control. doi
  29. (1997). Disturbances produced by the motion of an actuator. doi
  30. (1998). DNS of flow induced by a multi-flow actuator. ASME Fluids Engineering Division Meeting ASME paper number FEDSM98-5302.
  31. (1999). Effect of freestream turbulence and other vortical disturbances on a laminar boundarylayer.
  32. (1997). Effects of zero-mass "Synthetic" jets on the aerodynamics of the NACA-0012 airfoil. doi
  33. (1969). Elastic Plates.
  34. (1964). Elementary theory of elastic plates. doi
  35. (1994). Experimental investigation of a turbulent jet produced by an oscillating surface actuator. doi
  36. (1985). Experimental study of disturbances produced in a pretransitional laminar boundary layer by weak free stream turbulence. doi
  37. (1994). Experiments in a boundary layer subjected to free stream disturbances. doi
  38. (1958). Flow of rarefied gases.
  39. (1996). Flow over an obstacle emerging from the wall of a channel doi
  40. (1993). Innovative control of turbulent flows.
  41. (1994). Investigations of 'on-demand' vortex generators. Annual Research Briefs,
  42. (1972). Jets induced by oscillatory motion. doi
  43. (1998). Linear and nonlinear development of localized disturbances in zero and adverse pressure gradient boundary-layers. doi
  44. (1993). Manipulation of free shear flows using piezoelectric actuators.. doi
  45. (1996). Microelectromechanical systems for aerodynamics applications. doi
  46. (1994). Micromachined jets for manipulation of macro flows. Solid-State Sensor and Actuator Workshop,
  47. (1993). Mirbulent jets induced by surface actuators. doi
  48. (1998). Modification of lifting body aerodynamics using synthetic jet actuators. doi
  49. (1997). Modification of the aerodynamic characteristics of bluff bodies using fluidic actuators. doi
  50. (1996). Numerical investigation of suction in a transitional flat-plate boundary layer. doi
  51. (1999). Numerical investigation of sythetic-jet flow fields. doi
  52. (1998). Numerical investigation of the three-dimensional development in boundary-layer transition. doi
  53. (1990). Numerical methods for engineers. Second Edition,
  54. (1996). Numerical modelling of micromechanical devices using the direct simulation Monte Carlo method J. Fluids Eng. doi
  55. (1998). Numerical simulation and potential applications of zeromass jets for enhanced rotorcraft aerodynamic performance. doi
  56. (1997). Numerical simulation of synthetic jet actuators. doi
  57. (1997). Numerical simulation of the evolution of Tollmien-Schlichting waves over finite compliant walls. doi
  58. (1990). On management and control of turbulent shear flows. doi
  59. (1990). On sublayer streaks. doi
  60. (1991). On the dynamics of near-wall turbulence doi
  61. (1998). On the environmental realizability of algebraically growing disturbances and their relation to Klebanoff modes. doi
  62. (1994). On the generation of turbulent wall friction Phys. doi
  63. (1999). Optimal disturbances and by-pass transition in boundary layers. doi
  64. (1993). Optimal perturbations and streak spacing in wall-bounded turbulent shear flow. doi
  65. (1999). Oscillatory control of separation at high Reynolds numbers. doi
  66. (1999). Piezoelectric synthetic jets for aircraft control surfaces. doi
  67. (1932). Quelques solutions exactes des equations de Phydrodynarnique de fluide visqueux dans le cas d'un tube cylindrique.
  68. (1998). Reproducing the flow response to actuator motion. doi
  69. (1997). Response of the Blasius boundary-layer to free-stream vorticity. doi
  70. (1996). Review: MEMS and its applications for flow control. doi
  71. (1998). Scaling of an oscillatory flow-control actuator. AIAA Paper 98-0330. doi
  72. (1983). Scaling of the bursting frequency in turbulent boundary layers. doi
  73. (1995). Simulations of vortex generators. Annual Research Briefs,
  74. (1983). Sound and Sources of Sound. Ellis Horwood Pubs., doi
  75. (1975). Stability of linear flow. doi
  76. (1979). Streamwise vortices associated with the bursting phenomenon doi
  77. (1993). Studies on boundary-layer receptivity with parabolized stability equations. doi
  78. (1999). Synthetic jet actuators for flow control. doi
  79. (1997). Synthetic-jet microblowing for vortex asymmetry management on a hemisphere-cylinder forebody. doi
  80. (1997). System identification and active control of a turbulent boundary layer doi
  81. (1997). System identification and control of a turbulent boundary layer Phys. Fluids 9,1867-1869.
  82. (1989). The control of transient disturbances in a flat plate boundary layer through active wall motion. doi
  83. (1999). The development and implementation of synthetic jets for the control of separated flow. doi
  84. (1990). The evolution of a localized disturbance in a laminar boundary layer. Part 1. weak disturbances. doi
  85. (1990). The evolution of a localized disturbance in a laminar boundary layer. Part 2. strong disturbances. doi
  86. (1999). The fluid dynamics Of microdevices - The Freeman scholar lecture. doi
  87. (1998). The formation and evolution of synthetic jets. doi
  88. (1987). The growth and breakdown of strearnwise vortices in the presence of a wall. doi
  89. (1993). The Hydroelastic stability of threedimensional disturbances of a finite compliant Nvall J. Sound and Vibration doi
  90. (1956). The law of the wake in the turbulent boundary layer. doi
  91. (1991). The minimal flow unit in near-wall turbulence. doi
  92. (1997). The nonlinear hydroclastic behaviour of flexible Nvalls. doi
  93. (1967). The structure of turbulent boundary layers. doi
  94. (1971). The'bursting' phenomenon in a turbulent boundary layer. doi
  95. Three-dimensional optimal perturbations in viscous shear flow. doi
  96. (1930). Über den von doi
  97. (1969). Vibration of Plates. doi
  98. (1990). Viscous Flow. doi
  99. (1991). Viscous Fluid Flow. Second Edition,
  100. (1999). Vorticity flux control for a turbulent channel flow. doi
  101. WYGNANSKI, 1.1998 Effects of periodic excitation on turbulent flow separation from a flap. doi
  102. WYGNANSKIJ 1.1993 Oscillatory blowing: a tool to delay boundary-layer separation doi

To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.