Open AccessInvestigation on noise generation of open cavity flow using Lagrangian coherent structures
Author(s) -
Shuaibin Han,
Yibin Luo,
Hu Li,
Conghai Wu,
Shuhai Zhang
Publication year - 2021
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1786/1/012047
Subject(s) - reynolds number , mach number , flow (mathematics) , helmholtz resonator , noise (video) , physics , mechanics , dynamic mode decomposition , field (mathematics) , classical mechanics , mathematics , optics , turbulence , computer science , resonator , artificial intelligence , image (mathematics) , pure mathematics
The noise generation mechanism of an open cavity flow is investigated using Lagrangian coherent structures (LCS) together with dynamic mode decomposition and Helmholtz decomposition methods. The flow field of an open cavity with the length-depth ratio L/D = 2, Mach number Ma = 0.8 and Reynolds number Re = 2500 is first obtained through direct numerical simulation with 5-th order weighted essentially non-oscillatory (WENO) scheme. LCSs are then obtained from flow field reconstructed by the mean velocity field and the decomposed modes. The interactions between LCSs inside the shear layer and the squeezing zone are found to be important sound sources. The method efficiently isolates the structures responsible for the noise generation.