Numerical analysis of unsteady viscous flow through a Weis-Fogh-type ship propulsion mechanism using the advanced vortex method
Numerical analysis of unsteady viscous flow through a Weis-Fogh-type ship propulsion mechanism using the advanced vortex method
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- New search for: Ro, Kideok
- New search for: Zhu, Baoshan
- New search for: Kang, Hokeun
The velocity and pressure field 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 unmodeled large fluctuations in the measured data. Both the velocity and the pressure fields are predicted with integral equations. The results are summarized as follows: (1) The vortices which rotated in opposite directions near the two walls of the water channel are generated by the reciprocating motion of the wing. (2) The pressure distribution on the wing surface is shown to have entirely different characteristics during the opening stage, the translating stage, and the closing stage. (3) The coefficients of thrust (CT) and drag (CD) gradually increased as the wing approaches the opposite wall from which it started.
Document information
Numerical analysis of unsteady viscous flow through a Weis-Fogh-type ship propulsion mechanism using the advanced vortex method
Numerische Analysis der instationären, reibungsbehafteten Strömung durch einen Weis-Fogh-Schiffsantrieb unter Verwendung der fortgeschrittenen Wirbelmethode
Transactions of the ASME, Series I. Journal of Fluids Engineering ; 128 , 3 ; 481-487
2006
7 Seiten, 13 Bilder, 13 Quellen
Article (Journal)
English
reibungsbehaftete Strömung , instationäre Strömung , numerische Analysis , Schiffsantrieb , Wirbel (Strömung) , Geschwindigkeitsfeld , Druckverteilung , Flügel , Tragfläche (Aerodynamik) , Kanal (Hohlleitung) , Diffusion , Strömungsfeld , Schubkraft , Strömungswiderstand , Integralgleichung , Widerstandsbeiwert
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