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Acta Mechanica Sinica

, Volume 28, Issue 1, pp 221–231 | Cite as

Lateral dynamic flight stability of hovering insects: theory vs. numerical simulation

  • Yan-Lai Zhang
  • Jiang-Hao Wu
  • Mao Sun
Research Paper

Abstract

In the present paper, the lateral dynamic flight stability properties of two hovering model insects are predicted by an approximate theory based on the averaged model, and computed by numerical simulation that solves the complete equations of motion coupled with the Navier-Stokes equations. Comparison between the theoretical and simulational results provides a test to the validity of the assumptions made in the theory. One of the insects is a model drone-fly which has relatively high wingbeat frequency (164 Hz) and the other is a model hawkmoth which has relatively low wingbeat frequency (26 Hz). The following conclusion has been drawn. The theory based on the averaged model works well for the lateralmotion of the dronefly. For the hawkmoth, relatively large quantitative differences exist between theory and simulation. This is because the lateral non-dimensional eigenvalues of the hawkmoth are not very small compared with the non-dimensional flapping frequency (the largest lateral non-dimensional eigenvalue is only about 10% smaller than the non-dimensional flapping frequency). Nevertheless, the theory can still correctly predict variational trends of the dynamic properties of the hawkmoth’s lateral motion.

Keywords

Insect Hovering Lateral dynamic flight stability Averaged model Equations-of-motion Navier-Stokes simulation 

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Copyright information

© The Chinese Society of Theoretical and Applied Mechanics; Institute of Mechanics, Chinese Academy of Sciences and Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  1. 1.Ministry-of-Education Key Laboratory of Fluid MechanicsBeihang UniversityBeijingChina

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