Hydrodynamic and Acoustic Performance Analysis of Marine Propellers by Combination of Panel Method and FW-H Equations

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.

Numerical solution and experimental investigation for hydro-acoustic analysis and noise reduction assessment of ship ducted propeller

“…Another type of propeller noise which is negligible in Mach numbers smaller than 0.8, is caused by Disturbances and sheer tension in the fluid is known as Quadrupole. In this article for solving the FWH, considering the low value of Mach number, the Quadrupole noise in negligible therefore total noise contains only monopole (thickness noise) and dipole (loading noise) terms [ 22 ].…”

Special Issue “Mesh-Free and Finite Element-Based Methods for Structural Mechanics Applications”

“…The noise emitted by ships is one of the most important noises in the ocean, and propeller noise is one of the major components of ship noise. Ebrahimi et al [3] carried out a calculation of propeller noise using numerical methods because evaluation of propeller noise in the laboratory, despite the high accuracy and good reliability, has high costs and is very time-consuming. Software for numerical calculation of propeller noise, based on FW-H equations, was developed and the results were validated by experimental results.…”