LES of synthetic jets in boundary layer with laminar separation caused by adverse pressure gradient

Ozawa, T; Lesbros, S; Hong, G

LES of synthetic jets in boundary layer with laminar separation caused by adverse pressure gradient

Ozawa, T Lesbros, S Hong, G

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Publication Type:: Journal Article
Citation:: Computers and Fluids, 2010, 39 (5), pp. 845 - 858
Issue Date:: 2010-05-01

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Field	Value	Language
dc.contributor.author	Ozawa, T	en_US
dc.contributor.author	Lesbros, S	en_US
dc.contributor.author	Hong, G https://orcid.org/0000-0002-1905-1161	en_US
dc.date.issued	2010-05-01	en_US
dc.identifier.citation	Computers and Fluids, 2010, 39 (5), pp. 845 - 858	en_US
dc.identifier.issn	0045-7930	en_US
dc.identifier.uri	http://hdl.handle.net/10453/13526
dc.description.abstract	In the development of synthetic jet actuators (SJAs) for active flow control, numerical simulation has played an important role. In controlling the boundary layer flow separation, an integrated numerical model which includes both the baseline flow and the SJA is still in its initial stage of development. This paper reports preliminary results of simulating the interaction between a synthetic jet and a laminar separation bubble caused by adverse pressure gradient in a boundary layer. The computational domain was three-dimensional and Large-eddy simulation (LES) was adopted. The initial and boundary conditions were defined using or referring to our wind tunnel experimental results. Prior to numerically simulating the interaction between the synthetic jets and the baseline flow, a numerical model for simulating the separation bubble was developed and verified. In the numerical model including the SJA, the synthetic jet velocity at the exit of the SJA was defined as an input. The numerical model was further verified by comparing the simulation with experimental results. Based on reasonable agreement between the numerical and experimental results, simulations were carried out to investigate the dependency of flow control using synthetic jets on the forcing frequency, focused on the lower frequency range of the Tollmien-Schlichting (T-S) instability, and on the forcing amplitude which was represented by the maximum jet velocity at the exit of the SJA. Supporting the hypothesis based on the experiment, LES results showed that the forcing frequency had stronger influence on SJA's effective elimination of the separation bubble than the forcing amplitude did. © 2009 Elsevier Ltd. All rights reserved.	en_US
dc.relation.ispartof	Computers and Fluids	en_US
dc.relation.isbasedon	10.1016/j.compfluid.2009.12.012	en_US
dc.subject.classification	Applied Mathematics	en_US
dc.title	LES of synthetic jets in boundary layer with laminar separation caused by adverse pressure gradient	en_US
dc.type	Journal Article
utslib.citation.volume	5	en_US
utslib.citation.volume	39	en_US
utslib.for	0913 Mechanical Engineering	en_US
utslib.for	091305 Energy Generation, Conversion and Storage Engineering	en_US
utslib.for	0102 Applied Mathematics	en_US
utslib.for	0915 Interdisciplinary Engineering	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Mechanical and Mechatronic Engineering
utslib.copyright.status	open_access
pubs.issue	5	en_US
pubs.publication-status	Published	en_US
pubs.volume	39	en_US

Abstract:

In the development of synthetic jet actuators (SJAs) for active flow control, numerical simulation has played an important role. In controlling the boundary layer flow separation, an integrated numerical model which includes both the baseline flow and the SJA is still in its initial stage of development. This paper reports preliminary results of simulating the interaction between a synthetic jet and a laminar separation bubble caused by adverse pressure gradient in a boundary layer. The computational domain was three-dimensional and Large-eddy simulation (LES) was adopted. The initial and boundary conditions were defined using or referring to our wind tunnel experimental results. Prior to numerically simulating the interaction between the synthetic jets and the baseline flow, a numerical model for simulating the separation bubble was developed and verified. In the numerical model including the SJA, the synthetic jet velocity at the exit of the SJA was defined as an input. The numerical model was further verified by comparing the simulation with experimental results. Based on reasonable agreement between the numerical and experimental results, simulations were carried out to investigate the dependency of flow control using synthetic jets on the forcing frequency, focused on the lower frequency range of the Tollmien-Schlichting (T-S) instability, and on the forcing amplitude which was represented by the maximum jet velocity at the exit of the SJA. Supporting the hypothesis based on the experiment, LES results showed that the forcing frequency had stronger influence on SJA's effective elimination of the separation bubble than the forcing amplitude did. © 2009 Elsevier Ltd. All rights reserved.

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http://hdl.handle.net/10453/13526