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 language | English (US) |
|---|---|
| Title of host publication | 54th AIAA Aerospace Sciences Meeting |
| Publisher | American Institute of Aeronautics and Astronautics Inc, AIAA |
| ISBN (Print) | 9781624103933 |
| State | Published - 2016 |
| Event | 54th AIAA Aerospace Sciences Meeting, 2016 - San Diego, United States Duration: Jan 4 2016 → Jan 8 2016 |
Other
| Other | 54th AIAA Aerospace Sciences Meeting, 2016 |
|---|---|
| Country | United States |
| City | San Diego |
| Period | 1/4/16 → 1/8/16 |
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ASJC Scopus subject areas
- Aerospace Engineering
Cite this
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 proceeding › Conference contribution
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TY - GEN
T1 - Large eddy simulation of entrainment mechanism of a passive flow control for base drag reduction
AU - Yang, Yunchao
AU - Zha, GeCheng
PY - 2016
Y1 - 2016
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85007518130&partnerID=8YFLogxK
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M3 - Conference contribution
AN - SCOPUS:85007518130
SN - 9781624103933
BT - 54th AIAA Aerospace Sciences Meeting
PB - American Institute of Aeronautics and Astronautics Inc, AIAA
ER -