期刊
JOURNAL OF SOUND AND VIBRATION
卷 571, 期 -, 页码 -出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jsv.2023.118024
关键词
Finite Element Method; Frequency domain; Acoustics; Rotating Source; Rotating Obstacles; Frequency scattering boundary conditions
This paper presents a frequency domain numerical method for solving the propagation of sound waves in a three-dimensional domain with rotating obstacles. The method uses domain decomposition to embed rotating parts in a cylindrically-shaped domain and employs Frequency Scattering Boundary Conditions to achieve transmission conditions between fixed and rotating domains.
A frequency domain numerical method aimed at solving the propagation of sound waves in a three-dimensional domain enclosing rotating obstacles is presented. It relies on a domain decomposition whereby rotating parts are all embedded in a cylindrically-shaped domain. Following the classical Arbitrary Lagrangian Eulerian formalism, the governing equation, which is written in the local rotating frame, takes the form of a convected wave equation. The transmission conditions at the interface between the fixed and rotating domains is accomplished via the Frequency Scattering Boundary Conditions which, after classical FEM discretization, give rise to a series of coupled problems associated with a discrete set of frequencies. The performances of the method are demonstrated through several test cases involving rotating sources and/or obstacles inserted in circular and rectangular ducts.
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