A fast and storage-saving method for direct volumetric integration of FWH acoustic analogy
Loading...
Access rights
openAccess
URL
Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
This publication is imported from Aalto University research portal.
View publication in the Research portal (opens in new window)
View/Open full text file from the Research portal (opens in new window)
View publication in the Research portal (opens in new window)
View/Open full text file from the Research portal (opens in new window)
Date
2022-10-01
Major/Subject
Mcode
Degree programme
Language
en
Pages
11
Series
Ocean Engineering, Volume 261
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.Description
Keywords
Underwater noise, Acoustic analogy, Dual mesh technique, Cavitation, Propeller
Other note
Citation
Wang, Y, Mikkola, T & Hirdaris, S 2022, ' A fast and storage-saving method for direct volumetric integration of FWH acoustic analogy ', Ocean Engineering, vol. 261, 112087 . https://doi.org/10.1016/j.oceaneng.2022.112087