Partially Submerged Propeller Analysis in Open Water Condition by Developing Boundary Element Method Based on Potential

Document Type : Research Article

Authors

Department of Maritime Engineering, Amirkabir University of Technology, Tehran, Iran

Abstract

Since the design algorithm of partially submerged propeller (PSP) is under the influence of the various geometrical and physical parameters; so a new convenient method and numerical tools is required to flow analysis on propeller and consider the effect of all parameters simultaneously. The aim of this study is the development of boundary element method (BEM) based on potential for PSP analysis under open water condition. Using the concept of material derivative and kinematic boundary condition, a BEM algorithm has been developed to analyze the growth, development and change in thickness of ventilation-cavitation regimes in both chord and radial directions on wide range of advance velocity coefficients. Based on the obtained results, in the high advance coefficients there are very good conformity between the values obtained from the numerical simulation compared with experimental data and observations. This adaptation is reduced by reducing the value of advance coefficient. For the low advance coefficients ((J<0.4)) due to the intense eddy shedding (according to experimental results), oscillation of the ventilated surface end is effective on the propeller wake and is the cause of instability. While at the higher advance coefficients (J>0.4), hydrodynamic coefficients obtained from numerical results and efficiency of propeller compared with experimental measurements are desirable.

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