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Direct computation of zero-net-mass-flux synthetic jets
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Hayes-McCoy, Declan, Xi, Jiang and Lockerby, Duncan A. (2007) Direct computation of zero-net-mass-flux synthetic jets. In: 5th IASME/WSEAS International Conference on Fluid Mechanics and Aerodynamics, Vouliagmeni, Greece, 25-27 Aug 2007. Published in: Proceedings of the 5th IASME/WSEAS International Conference On Fluid Mechanics And Aerodynamics (FMA '07) pp. 217-222. ISBN 9789608457997.
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Abstract
Axisymmetric direct numerical simulations (DNS) are performed to study the formation criterion and evolution of zero net mass-flux synthetic jets. Jet formation is defined by an oscillating streamwise jet centreline velocity, showing net momentum flux away from the orifice. This momentum flux away from the orifice takes the form of a series of vortical structures, often referred to as a vortex train. Modelling of the jet actuator consists of a modified oscillating velocity profile applied to a wall boundary. The jet issues into quiescent air, and the Reynolds numbers used vary from 85 < Re < 1000. Variations to the input simulation parameters are carried out in order to determine the overall effects on the flow field. From these results the conditions necessary for the formation of the synthetic jet along with the input parameters that provide an optimal jet output are deduced. Jet optimisation is defined by both the vortical strength and longevity of the vortex train as it travels downstream. This study examines both the vortical structures, the jet centreline velocities along with other external flow characteristics in order to deduce and visualise the effects of the input parameters on the jet performance. The results attained on altering the oscillation amplitude and frequency of the jet actuator are in good agreement with previous studies. Further details on the jet centreline velocity for all cases are also presented; along with a study on the effects on the vortical structures of altering the Reynolds number of the flow.
Item Type: | Conference Item (Lecture) | ||||
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Subjects: | Q Science > QA Mathematics > QA76 Electronic computers. Computer science. Computer software T Technology > TK Electrical engineering. Electronics Nuclear engineering Q Science > QA Mathematics |
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Divisions: | Faculty of Science, Engineering and Medicine > Engineering > Engineering | ||||
Series Name: | Mathematics and Computers in Science and Engineering | ||||
Journal or Publication Title: | Proceedings of the 5th IASME/WSEAS International Conference On Fluid Mechanics And Aerodynamics (FMA '07) | ||||
Publisher: | World Scientific And Engineering Acad And Soc | ||||
ISBN: | 9789608457997 | ||||
Editor: | Sohrab, SH and Catrakis, HJ and Kobasko, N and Necasova, S | ||||
Official Date: | 2007 | ||||
Dates: |
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Number of Pages: | 6 | ||||
Page Range: | pp. 217-222 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Conference Paper Type: | Lecture | ||||
Title of Event: | 5th IASME/WSEAS International Conference on Fluid Mechanics and Aerodynamics | ||||
Location of Event: | Vouliagmeni, Greece | ||||
Date(s) of Event: | 25-27 Aug 2007 |
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