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Abstract
This paper proposes a new method that makes the direct volume integration of the Lighthill stress term in FWH acoustic analogy affordable in terms of both computational time and disk storage requirement. The method is based on a dual mesh concept, i.e. while a fine mesh is used in CFD, a relatively coarse mesh is used for the acoustic calculation. The terms being independent of the observer positions in the integral formula of FWH acoustic analogy are calculated on the CFD mesh and mapped onto the acoustic mesh during the simulation. These sound source terms are used for the on-the-fly acoustic computation or saved for later use in the post-processing. A formulation of the Lighthill stress tensor in cavitating flow is also derived. The method is verified with the acoustic assessment of an inclined marine propeller case. A reduction of the calculation time by 98% and disk storage by 99% is achieved while maintaining small acoustic error.
Original language | English |
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Article number | 112087 |
Number of pages | 11 |
Journal | Ocean Engineering |
Volume | 261 |
DOIs | |
Publication status | Published - 1 Oct 2022 |
MoE publication type | A1 Journal article-refereed |
Keywords
- Underwater noise
- Acoustic analogy
- Dual mesh technique
- Cavitation
- Propeller
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Dive into the research topics of 'A fast and storage-saving method for direct volumetric integration of FWH acoustic analogy'. Together they form a unique fingerprint.Projects
- 1 Finished
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Green Small Craft: Green Cruising for High-speed Small Craft in The Baltic Sea
Wang, Y. (Project Member), Raitio, R. (Principal investigator) & Hirdaris, S. (Project Member)
19/06/2020 → 30/09/2021
Project: EU: Structural funds EAKR (incl. Interreg)