Ship radiated sound computation in a constrained domain

Abstract

Nowadays, many computational methods are used to predict propeller-radiated noise. Nevertheless, the results from physical measurements and computer models show significant discrepancies. The difference between the results is due to the capabilities and limitations of measurement methods and simulation models. Therefore, approaches that mimic actual environments are needed. Bearing in mind that today’s seas and oceans are polluted by sound, understanding the underwater sound propagation phenomenon can help set appropriate points for real-scale physical measurements and support the silent design of propellers. The thesis purpose is to design a three-dimensional Finite Difference Time Domain model for calculating underwater sound propagation with features of fully reflective and semi-reflective boundary conditions and free space propagation. The code is implemented in Matlab and validated by different experiments and comparisons with analytical solutions. Essentially, these simulations imitate environments like open seas, shallow waters, water canals, and cavitation tunnels.