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# Mathematical butterflies provide insight into how insects fly

Date:
March 25, 2013
Source:
American Institute of Physics
Summary:
Researchers have developed sophisticated numerical simulations of a butterfly's forward flight.

In Robert A. Heinlein's science-fiction novel, The Cat Who Walks Through Walls, one of the characters states that butterflies are just "…self-propelled flowers." While Heinlein's description of the insect's aerodynamic ability is quite poetic, it does little to scientifically explain it. Four Japanese researchers have done a bit better by developing sophisticated numerical simulations of a butterfly's forward flight.

In a paper in the American Institute of Physics' journal Physics of Fluids, the researchers describe how they mathematically modeled a butterfly as a four-link rigid-body system consisting of a thorax (the segment of the insect to which the wings are attached), an abdomen, and the two wings.

Using data from observations of butterfly flight in wind tunnels, the researchers conducted three different types of simulations with their model that were defined by the position and attitude of the thorax: tethered (where the thorax is fixed), prescribed (where the thorax is programmed to move in an expected manner) and free-flight (where the thorax movement is unrestricted). They found that their mathematical butterfly did -- as predicted -- make use of the tiny, swirling vortices that form in the direction of travel during a downward flap, pushing air down and providing lift. However, they also observed that the flow around the butterfly is much more turbulent than expected. This turbulent flow triggers the complex trajectories characteristic to the flights of butterflies that may be one of the strategies by which the insects avoid predators.

Finally, the researchers determined that the pitching angle of the thorax is the key to controlled periodic flight, noting that living butterflies likely can continually sense the attitude of their thorax and adjust their flapping motion accordingly to ensure stability. The researchers state that their future work will focus on identifying the mechanism by which this control is achieved.

Story Source:

The above story is based on materials provided by American Institute of Physics. Note: Materials may be edited for content and length.

Journal Reference:

1. Naoto Yokoyama, Kei Senda, Makoto Iima, Norio Hirai. Aerodynamic forces and vortical structures in flapping butterfly's forward flight. Physics of Fluids, 2013; 25 (2): 021902 DOI: 10.1063/1.4790882

American Institute of Physics. "Mathematical butterflies provide insight into how insects fly." ScienceDaily. ScienceDaily, 25 March 2013. <www.sciencedaily.com/releases/2013/03/130325125644.htm>.
American Institute of Physics. (2013, March 25). Mathematical butterflies provide insight into how insects fly. ScienceDaily. Retrieved July 24, 2014 from www.sciencedaily.com/releases/2013/03/130325125644.htm
American Institute of Physics. "Mathematical butterflies provide insight into how insects fly." ScienceDaily. www.sciencedaily.com/releases/2013/03/130325125644.htm (accessed July 24, 2014).

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