Flow-induced noise analysis for 3D trash rack based on LES/Lighthill hybrid method

Abstract A trash rack is used to obstruct dirt in a flow. As it is on the outside of the hull of a ship, such flow-induced noise cannot be ignored. This paper focuses on a hydrodynamic noise study of the trash rack installed on the inlet of pipelines to estimate the noise produced by the turbulent flow. A hybrid method of combining Large-Eddy Simulation (LES) and the Lighthill’s acoustic analogy theory simulate the flow-induced noise for a three-dimensional pipeline. The results of the simulation agree well with the experimental results available in the open literature. Following this, the hydrodynamic noise of flow through a three-dimensional pipeline with different types of trash racks is studied in order to determine the best form. For this objective, the flow and sound properties in different simulation models are analyzed and a low noise type of trash rack is proposed based on some general indexes.

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