Abstract
The noise emitted by ships is one of the most important noises in the ocean, and the propeller noise is one of the major components of the ship noise. Measuring the propeller noise in a laboratory, despite the high accuracy and good reliability, has high costs and is very time-consuming. For this reason, the calculation of propeller noise using numerical methods has been considered in recent years. In this study, the noise of a propeller in non-cavitating conditions is calculated by the combination of the panel method (boundary element method) and solving the Ffowcs Williams-Hawkings (FW-H) equations. In this study, a panel method code is developed, and the results are validated by the experimental results of the model tests carried out in the cavitation tunnel of the Sharif University of Technology. Software for numerical calculation of propeller noise, based on FW-H equations, is also developed and the results are validated by experimental results. This study shows that the results of the panel method code have good agreement with experimental results, and that the maximum error of this code for the thrust and torque coefficients is 4% and 7%, respectively. The results of the FW-H noise code are also in good agreement with the experimental data.
Highlights
The use of numerical methods has become very common in modeling the flow around marine propellers
Compared to other numerical methods such as finite element or finite volume method which interior of domain should be considered, boundary element method (BEM) exhibits less solution time and computation cost and it is preferred to other methods
The results of this study show that the panel method can model cavitation on propeller blades with good accuracy
Summary
The use of numerical methods has become very common in modeling the flow around marine propellers. Bagheri et al [12] carried out some numerical and experimental tests on the noise of marine propellers and the effects of cavitation on the sound pressure level of propeller. They used viscous flow with FW-H solver for noise calculation. The FW-H equations are used for acoustic performance analysis of these propellers For this purpose, two codes have been developed by authors and their results validated using experimental tests carried out in cavitation tunnel of Sharif University of Technology. The most significant novelty of our paper is that we used experimental noise measurements to validate the results of the FW-H equations code
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