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Hydrodynamic Characteristics of a Small Bee in Hovering Flight

Ro, Ki-Deok   (School of Mechanical and Aerospace Engineering.Institute of Marine Industry, Gyeongsang National UniversityUU0000114  ); Kim, Kwang-Seok   (Graduate School of Gyeongsang National University, Department of Mechanical system EngineeringUU0000114  );
  • 초록

    The three-dimensional flows in the Weis-Fogh mechanism are studied by flow visualization and numerical simulation by the vortex method. The vortex method. especially the vortex stick method, is employed to investigate the vortex structure in the wake of the two wings. The pressure is estimated by the Bernoulli equation, and the lift on the wing are also obtained. As the results the eddies near the leading edge of each wing in the fling stage take a convex shape because the eddies shed from both tips entrain the flows and the downwash in the rotating stage is deflected toward the outside because the outside tip vortex is stronger than the inside one. And the lift coefficient on the wings in this mechanism is almost independent of the Reynolds number.


  • 주제어

    Computational Fluid Dynamics .   Vortex Method .   Unsteady flow .   Random Walk Method.  

  • 참고문헌 (9)

    1. Sarpkaya,T., 'Computational Methods with Vortices,' ASME Journal of fluids Engineering, Vol.111, March, pp5-52, 1989 
    2. Chorin,A.J., 'Numerical Study of Slightly Viscous Flow,' Journal of Fluid Mechanics, Vol.57,pp.785-796, 1973 
    3. Spedding,G.R. and Maxworthy,T., 'The Generation of Circulation and Lift in a Rigid Two-Dimensional Fling,' Journal of Fluid Mechanics, Vol.165, pp.247-272, 1986 
    4. Leonard,A., 'Vortex method for Flow Simulation,' Journal of Computational Physics. Vol.37, pp289-335, 1980 
    5. Shirayama, S.,et al., 'A Three dimen- sional Vortex Method', AIAA Paper, 85-1488, pp.14-24, 1985 
    6. Maxworthy,T., 'Experiments on the Weis- Fogh Mechanism of Life Generation by Insects in Hovering Flight,' Journal of Fluid Mechanics, Vol.93,pp.47-63, 1979 
    7. Weis-Fogh,T., 'Quick Estimates of Flight Fitness in Hovering Animals, Including Novel Mechanism for Lift Production,' Journal of Experimental Biology, Vol.59, pp.169-231, 1973 
    8. Lighthill,M.J., 'On the Weis-Figh Mechanism of Lift Generation,' Journal of Fluid Mechanics, Vol.60, pp.1-17, 1973 
    9. Ro, K. D. and Tsutahara. M., 'Numerical Analysis of Unsteady Flow in the Weis-Fogh Mechanism by the 3D Discrete Vortex Method with GRAPE3A,' Transactions of the ASME, Journal of Fluids Engineering, Vol.119, pp. 96-102, 1997 

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  • 노기덕 (28)

    1. 1997 "Weis-Fogh형 선박 추진기구의 역학적 특성계산" 大韓機械學會論文集. Transactions of the Korean Society of Mechanical Engineers. B. B 21 (11): 1518~1526    
    2. 1998 "2단식 Weis-Foghg형 선박 추진기구의 유동장 특성계산" 韓國舶用機關學會誌 = Journal of the Korean Society of Marine Engineers 22 (3): 371~380    
    3. 1998 "이산와법에 의한 원호형 Sea Anchor의 유동장 수치해석" 大韓機械學會論文集. Transactions of the Korean Society of Mechanical Engineers. B. B 22 (8): 1041~1051    
    4. 2000 "Calculation of Thrust and Drag Characteristics for Ship′s Propulsion Mechanism of Weis-Fogh Type" KSME international journal 14 (11): 1257~1266    
    5. 2001 "표면에 딤블이 있는 원주의 항력감소" 韓國舶用機關學會誌 = Journal of the Korean Society of Marine Engineers 25 (1): 155~161    
    6. 2002 "표면에 정방형 딤플을 가진 원추의 항력저감 특성" 韓國舶用機關學會誌 = Journal of the Korean Society of Marine Engineers 26 (2): 233~239    
    7. 2003 "직렬 및 병렬배열에서 2원주의 유체역학적 간섭" 韓國舶用機關學會誌 = Journal of the Korean Society of Marine Engineers 27 (1): 49~56    
    8. 2003 "이산와법에 의한 다양한 배열에서 2원주 주위의 유동장 계산" 韓國舶用機關學會誌 = Journal of the Korean Society of Marine Engineers 27 (3): 365~372    
    9. 2004 "정방형 딤플을 가진 회전원주의 유동장 특성" 大韓機械學會論文集. Transactions of the Korean Society of Mechanical Engineers. B. B 28 (4): 486~492    
    10. 2004 "Numerical Calculation of Flow Pattern and Fluid Force on a Circular Arc-type Sea Anchor" 韓國舶用機關學會誌 = Journal of the Korean Society of Marine Engineers 28 (8): 1258~1269    
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