Vortex dynamics in near wake of a hovering hawkmoth

Aono Hikaru; Shyy Wei; Liu Hao

Vortex dynamics in near wake of a hovering hawkmoth

Aono Hikaru^*, Shyy Wei, Liu Hao

^*Corresponding author for this work

Research output: Chapter in Book/Conference Proceeding/Report › Conference Paper published in a book › peer-review

9 Citations (Scopus)

Abstract

Numerical investigation of vortex dynamics in near wake of a hovering hawkmoth and hovering aerodynamics is conducted with a biology-inspired dynamic flight simulator. This simulator is developed to be capable of 'flying' an insect on a basis of realistic wing-body morphologies and kinematics. The computed results show a three-dimensional mechanism of vortical structures in hawkmoth hovering. A horseshoe-shaped vortex is observed, which wraps around each wing during the early down- and upstroke but subsequently grows into a doughnut-shaped vortex ring, with an intense jet-flow present in its core, forming the downwash. The doughnut-shaped vortex rings of the wing pair eventually break up into two circular vortex rings downward in the wake. We furthermore evaluate the hovering energetics in terms of torques and powers based on the computed aerodynamic forces and velocity of the flapping wings.

Original language	English
Title of host publication	46th AIAA Aerospace Sciences Meeting and Exhibit
Publication status	Published - 2008
Externally published	Yes
Event	46th AIAA Aerospace Sciences Meeting and Exhibit - Reno, NV, United States Duration: 7 Jan 2008 → 10 Jan 2008

Publication series

Name	46th AIAA Aerospace Sciences Meeting and Exhibit

Conference

Conference	46th AIAA Aerospace Sciences Meeting and Exhibit
Country/Territory	United States
City	Reno, NV
Period	7/01/08 → 10/01/08

Cite this

@inproceedings{2e70c430e59b442abc3f2bf6daa57cff,

title = "Vortex dynamics in near wake of a hovering hawkmoth",

abstract = "Numerical investigation of vortex dynamics in near wake of a hovering hawkmoth and hovering aerodynamics is conducted with a biology-inspired dynamic flight simulator. This simulator is developed to be capable of 'flying' an insect on a basis of realistic wing-body morphologies and kinematics. The computed results show a three-dimensional mechanism of vortical structures in hawkmoth hovering. A horseshoe-shaped vortex is observed, which wraps around each wing during the early down- and upstroke but subsequently grows into a doughnut-shaped vortex ring, with an intense jet-flow present in its core, forming the downwash. The doughnut-shaped vortex rings of the wing pair eventually break up into two circular vortex rings downward in the wake. We furthermore evaluate the hovering energetics in terms of torques and powers based on the computed aerodynamic forces and velocity of the flapping wings.",

author = "Aono Hikaru and Shyy Wei and Liu Hao",

year = "2008",

language = "English",

isbn = "9781563479373",

series = "46th AIAA Aerospace Sciences Meeting and Exhibit",

booktitle = "46th AIAA Aerospace Sciences Meeting and Exhibit",

note = "46th AIAA Aerospace Sciences Meeting and Exhibit ; Conference date: 07-01-2008 Through 10-01-2008",

}

TY - GEN

T1 - Vortex dynamics in near wake of a hovering hawkmoth

AU - Hikaru, Aono

AU - Wei, Shyy

AU - Hao, Liu

PY - 2008

Y1 - 2008

N2 - Numerical investigation of vortex dynamics in near wake of a hovering hawkmoth and hovering aerodynamics is conducted with a biology-inspired dynamic flight simulator. This simulator is developed to be capable of 'flying' an insect on a basis of realistic wing-body morphologies and kinematics. The computed results show a three-dimensional mechanism of vortical structures in hawkmoth hovering. A horseshoe-shaped vortex is observed, which wraps around each wing during the early down- and upstroke but subsequently grows into a doughnut-shaped vortex ring, with an intense jet-flow present in its core, forming the downwash. The doughnut-shaped vortex rings of the wing pair eventually break up into two circular vortex rings downward in the wake. We furthermore evaluate the hovering energetics in terms of torques and powers based on the computed aerodynamic forces and velocity of the flapping wings.

AB - Numerical investigation of vortex dynamics in near wake of a hovering hawkmoth and hovering aerodynamics is conducted with a biology-inspired dynamic flight simulator. This simulator is developed to be capable of 'flying' an insect on a basis of realistic wing-body morphologies and kinematics. The computed results show a three-dimensional mechanism of vortical structures in hawkmoth hovering. A horseshoe-shaped vortex is observed, which wraps around each wing during the early down- and upstroke but subsequently grows into a doughnut-shaped vortex ring, with an intense jet-flow present in its core, forming the downwash. The doughnut-shaped vortex rings of the wing pair eventually break up into two circular vortex rings downward in the wake. We furthermore evaluate the hovering energetics in terms of torques and powers based on the computed aerodynamic forces and velocity of the flapping wings.

UR - https://www.scopus.com/pages/publications/78149428711

M3 - Conference Paper published in a book

AN - SCOPUS:78149428711

SN - 9781563479373

T3 - 46th AIAA Aerospace Sciences Meeting and Exhibit

BT - 46th AIAA Aerospace Sciences Meeting and Exhibit

T2 - 46th AIAA Aerospace Sciences Meeting and Exhibit

Y2 - 7 January 2008 through 10 January 2008

ER -

Vortex dynamics in near wake of a hovering hawkmoth

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Conference

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