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Numerical investigation of the near-field flow-structures produced by a pitched and skewed vortex generating jet
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Jewkes, James and Chung, Yongmann M. (2011) Numerical investigation of the near-field flow-structures produced by a pitched and skewed vortex generating jet. In: Turbulence Shear Flow and Phenomenon (TSFP-7), Ottawa, Canada, Jul 28-31, 2011. Published in: Proceedings of the Seventh International Symposium on Turbulence and Shear Flow Phenomena
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Official URL: http://www.tsfp7.org/papers/5D3P.pdf
Abstract
A large-eddy simulation of a velocity-ratio (VR = 1:0),
pitched and skewed vortex generating jet issuing into a turbulent boundary layer (Red delta* = 2000) is presented. As the jet issues from the orifice, an asymmetrical counter-rotating vortex pair is produced, consisting of a strong primary vortex and a weaker secondary vortex. The secondary vortex quickly dissipates to leave the primary vortex, which persists farther downstream. The primary vortex replaces the near-wall region with higher momentum fluid, and is shown to be associated with improved skin friction downstream of the jet. This increase in skin friction has been previously shown to be associated with improved resistance to boundary-layer separation.
| Item Type: | Conference Item (Paper) | ||||
|---|---|---|---|---|---|
| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) | ||||
| Divisions: | Faculty of Science, Engineering and Medicine > Engineering > Engineering | ||||
| Journal or Publication Title: | Proceedings of the Seventh International Symposium on Turbulence and Shear Flow Phenomena | ||||
| Official Date: | 2011 | ||||
| Dates: |
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| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Open Access (Creative Commons) | ||||
| Funder: | Engineering and Physical Sciences Research Council (EPSRC), UK Turbulence Consortium | ||||
| Grant number: | Grant EP/G069581/1 | ||||
| Conference Paper Type: | Paper | ||||
| Title of Event: | Turbulence Shear Flow and Phenomenon (TSFP-7) | ||||
| Type of Event: | Other | ||||
| Location of Event: | Ottawa, Canada | ||||
| Date(s) of Event: | Jul 28-31, 2011 |
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