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Numerical simulation of the interaction of microactuators and boundary layers

Carpenter, P. W., Lockerby, D. A. and Davies, Christopher 2002. Numerical simulation of the interaction of microactuators and boundary layers. AIAA Journal 40 (1) , pp. 67-73.

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A technique is presented for carrying out relatively low-cost numerical simulations of the interaction between three-dimensional microelectromechanical systems (MEMS)- and mesoscale actuators and a laminar boundary layer. The jet-type actuators take the form of a diaphragmlocated at the bottom of a cavity. When the diaphragm is driven by piezoceramic, for example, it de� ects, reduces the cavity volume, and drives air out of an ori� ce as a jet into the boundary layer. In an attempt to avoid an in� ow phase into the cavity, we study the effects of a “puff-like” jet produced when the diaphragmis driven by a short-duration constant force, or the cavity pressure is suddenly increased by providing air from a microvalve. The theoretical model for the actuator is based on classic thin-plate theory for the diaphragmdynamics andmodi� ed unsteady pipe-� owtheory for the � uid dynamics in the ori� ce/nozzle leading to the boundary layer. The cavity � uid dynamics is not modeled in detail; the compressible � owinit is neglected, and the instantaneouspressure there is determined viathe perfect gas law.A velocity–vorticity method is used to compute the perturbation � ow� eld created in the boundary layer. This method is capable of full direct numerical simulations, but for the present results the governing equations were linearized. The cavity and boundary-layer � ow� elds are linked by requiring continuity of velocity and pressure at the ori� ce exit. The computational methods are used to investigate such questions as the need for fully interactive computations and the differences between meso- and MEMS-scale actuators.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Mathematics
Subjects: Q Science > QA Mathematics
T Technology > TA Engineering (General). Civil engineering (General)
Publisher: The American Institute of Aeronautics and Astronautics (AIAA)
ISSN: 0001-1452
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Last Modified: 04 Jun 2017 03:41

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