수중 프로펠러의 소음 예측에 관한 연구(Part 1. 비공동 소음)
Grid Generation and Flow Analysis around a Twin-skeg Container Ship
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Abstract
The non-cavitating noise of underwater propeller is considered numerically in this study. The main purpose is to analyze non-cavitating noise from underwater propellers in various operating conditions with different configurations. Noise is predicted by using time-domain acoustic analogy, boundary element method, and computational hydro-acoustics. The flow field is analyzed with potential-based panel method, and then time-dependant pressure data are used as the input for Ffowcs Williams-Hawkings formulation to predict far field acoustics. Furthermore, boundary element method and computational hydroacoustics are also considered to investigate duct propeller and ducted multi-stage propeller to consider the reflection and diffraction of sound waves. With this methodology, noise intensity and directivity of each noise sources could be well analyzed.
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