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Numerical Analysis of Unsteady Viscous Flow Through a Weis-Fogh Type Ship Propulsion Mechanism Using the Advanced Vortex Method

Ro Ki-Deok    (School of Mechanical and Aerospace Engineering, Institute of Marine Industry Gyeongsang Ntional University   ); Kang Myeong-Hun    (Graduate School, Department of Mechanical System Engineering, Gyeongsang National University   ); Kong Tae-Hee    (Graduate School, Department of Mechanical System Engineering, Gyeongsang National University  );
  • 초록

    The velocity and pressure fields of a ship's Weis-Fogh type propulsion mechanism are studied in this paper using an advanced vortex method. The wing (NACA0010 airfoil) and channel are approximated by source and vortex panels. and free vortices are introduced away from the body surfaces. The viscous diffusion of fluid is represented using the core-spreading model to the discrete vortices. The velocity is calculated on the basis of the generalized Biot-Savart law and the pressure field is calculated from an integral, based on the instantaneous velocity and vorticity distributions in the flow field. Two-dimensional unsteady viscous flow calculations of this propulsion mechanism are shown. and the calculated results agree qualitatively with the measured thrust and drag due to un-modeled large fluctuations in the measured data.


  • 주제어

    Computational fluid dynamics .   Vortex method .   Propulsion mechanism .   Unsteady flow.  

  • 참고문헌 (8)

    1. Weis-Fogh, T., 'Quick Estimates of Flight Fitness in Hovering Animals, Including Novel Mechanism for Lift Production', J. Exp. Bio. Vol. 59, pp. 169-230, 1973 
    2. Kamemoto, K., 'On Attractive Features of the Vortex Methods', Comp. Fluid Dyn. Rev. 1995 ed. Hafez, M. & Oshima, K. JOHN WILEY & SONS., pp. 334-353 
    3. Leonard, A., 'Vortex Methods For Flow Simulations', J. Comp. Pbys., Vol. 37, pp. 289-335, 1980 
    4. Uhlman, J. S., 'An Integral Equation Formulation of the Equation of Motion of an Incompressible Fluid', Naval Undersea Warfare Center T.R., pp. 10-086, 1992 
    5. Tsutahara, M., Kimura, T. & Ro, K. D., 'Ship Propulsion Using the Weis-Fogh mechanism', Bull. Mari. Eng. Soc. (in Japan). Vol. 17, No. 2, pp. 49-55, 1989 
    6. Ro, K. D., 'Calculation of Thrust and Drag Characteristics for Ship's Propulsion Mechanism of Weis-Fogh Type', KSME Intl. J., Vol. 14, No. 11, pp. 1249-1258, 2000 
    7. Tsutahara, M. & Kimura, T., 'An Application of the Weis-Fogh Mechanism to Ship Propulsion', Trans. ASME J. Fluids Eng, Vol. 109, No. 2, pp. 107-113, 1987 
    8. Lighthill, M. J., 'On the Weis-Fogh Mechanism of Lift Generation', J. Fluid Mech, Vol. 60, pp. 1-17, 1973 

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