Large eddy simulation of entrainment mechanism of a passive flow control for base drag reduction

Yunchao Yang, GeCheng Zha

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Large eddy simulation (LES) of a passive flow control application, namely Jet Boat Tail (JBT), on a base configuration is performed. LES results indicate that a significant reduction of base drag by 15.6% is achieved using the JBT passive flow control. Two different flow structures are detected for the baseline model. The lower outstanding frequency of velocity fluctuation is attributed to the large scale instability of vortex shedding, whereas the higher frequency is the result of small scale instabilities from the separation of shear layer. For the baseline model, large scale vortex structures are dominant. For the JBT model, The periodically pulsing jet interacts with the base flow and free stream shear layer. The interactions generate vortex pairing and enhance the mixing and entrainment effect. Higher frequencies flow entrainment is dominant for the JBT model.

Original languageEnglish (US)
Title of host publication54th AIAA Aerospace Sciences Meeting
PublisherAmerican Institute of Aeronautics and Astronautics Inc, AIAA
ISBN (Print)9781624103933
StatePublished - 2016
Event54th AIAA Aerospace Sciences Meeting, 2016 - San Diego, United States
Duration: Jan 4 2016Jan 8 2016

Other

Other54th AIAA Aerospace Sciences Meeting, 2016
CountryUnited States
CitySan Diego
Period1/4/161/8/16

Fingerprint

Drag reduction
Large eddy simulation
Flow control
Boats
Vortex flow
Vortex shedding
Flow structure
Drag

ASJC Scopus subject areas

  • Aerospace Engineering

Cite this

Yang, Y., & Zha, G. (2016). Large eddy simulation of entrainment mechanism of a passive flow control for base drag reduction. In 54th AIAA Aerospace Sciences Meeting American Institute of Aeronautics and Astronautics Inc, AIAA.

Large eddy simulation of entrainment mechanism of a passive flow control for base drag reduction. / Yang, Yunchao; Zha, GeCheng.

54th AIAA Aerospace Sciences Meeting. American Institute of Aeronautics and Astronautics Inc, AIAA, 2016.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Yang, Y & Zha, G 2016, Large eddy simulation of entrainment mechanism of a passive flow control for base drag reduction. in 54th AIAA Aerospace Sciences Meeting. American Institute of Aeronautics and Astronautics Inc, AIAA, 54th AIAA Aerospace Sciences Meeting, 2016, San Diego, United States, 1/4/16.
Yang Y, Zha G. Large eddy simulation of entrainment mechanism of a passive flow control for base drag reduction. In 54th AIAA Aerospace Sciences Meeting. American Institute of Aeronautics and Astronautics Inc, AIAA. 2016
Yang, Yunchao ; Zha, GeCheng. / Large eddy simulation of entrainment mechanism of a passive flow control for base drag reduction. 54th AIAA Aerospace Sciences Meeting. American Institute of Aeronautics and Astronautics Inc, AIAA, 2016.
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