Journal of Advanced Marine Engineering and Technology

The Korean Society of Marine Engineering (한국마린엔지니어링학회)
권호 표지

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)
  • Published : 2005.11.01
Download PDF
⟨ Previous Next ⟩

Abstract

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.

Keywords

References

  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. Lighthill, M. J., 'On the Weis-Fogh Mechanism of Lift Generation', J. Fluid Mech, Vol. 60, pp. 1-17, 1973 https://doi.org/10.1017/S0022112073000017
  3. 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 https://doi.org/10.1115/1.3242629
  4. 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
  5. 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
  6. 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
  7. Leonard, A., 'Vortex Methods For Flow Simulations', J. Comp. Pbys., Vol. 37, pp. 289-335, 1980 https://doi.org/10.1016/0021-9991(80)90040-6
  8. 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