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Numerical analysis of cavitating propeller and pressure fluctuation on ship stern using a simple surface panel method “SQCM”

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Abstract

This paper presents a calculation method for the pressure fluctuation induced by a cavitating propeller. This method consists of two steps: the first step is the calculation of propeller sheet cavitation, and the second step is the calculation of pressure fluctuation on the ship stern. It is for practicality that we divide the method into two steps but do not calculate these steps simultaneously. This method is based on a simple surface panel method “SQCM” which satisfies the Kutta condition easily. The SQCM consists of Hess and Smith type source panels on the propeller or cavity surface and discrete vortices on the camber surface according to Lan’s QCM (quasi-continuous vortex lattice method). In the first step, the cavity shape is solved by the boundary condition based on the free streamline theory. In order to get the accurate cavity shape near the tip of the propeller blade, the cross flow component is taken into consideration on the boundary condition. In the second step, we calculate the cavitating propeller and the hull surface flow simultaneously so as to calculate the pressure fluctuation including the interaction between the propeller and the hull. At that time, the cavity shape is changed at each time step using the calculated cavity shape gotten by the first step. Qualitative agreements are obtained between the calculated results and the experimental data regarding cavity shape, cavity volume and low order frequency components of the pressure fluctuation induced by the cavitating propeller.

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  1. Faculty of Engineering, Kyushu University, Fukuoka, Japan

    T. Kanemaru & J. Ando

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  1. T. Kanemaru
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  2. J. Ando
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Correspondence to T. Kanemaru.

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Kanemaru, T., Ando, J. Numerical analysis of cavitating propeller and pressure fluctuation on ship stern using a simple surface panel method “SQCM”. J Mar Sci Technol 18, 294–309 (2013). https://doi.org/10.1007/s00773-012-0208-8

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  • DOI: https://doi.org/10.1007/s00773-012-0208-8

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