Turbulence-induced noise of a submerged cylinder using a permeable FW-H method
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초록
Among underwater noise sources around submerged bodies, turbulence-induced noise has not been well investigated because of the difficulty of predicting it. In computational aeroacoustics, a number of studies has been conducted using the Ffowcs WilliamseHawkings (FWeH) acoustic analogy without consideration of quadrupole source term due to the unacceptable calculation cost. In this paper, turbulence-induced noise is predicted, including that due to quadrupole sources, using a large eddy simulation (LES) turbulence model and a developed formulation of permeable FWeH method with an open source computational fluid dynamics (CFD) tool-kit. Noise around a circular cylinder is examined and the results of using the acoustic analogy method with and without quadrupole noise are compared, i.e. the FWeH method without quadrupole noise versus the permeable FWeH method that includes quadrupole sources. The usability of the permeable FWeH method for the prediction of turbulence-noise around submerged bodies is shown.
Abstract
Among underwater noise sources around submerged bodies, turbulence-induced noise has not been well investigated because of the difficulty of predicting it. In computational aeroacoustics, a number of studies has been conducted using the Ffowcs WilliamseHawkings (FWeH) acoustic analogy without consideration of quadrupole source term due to the unacceptable calculation cost. In this paper, turbulence-induced noise is predicted, including that due to quadrupole sources, using a large eddy simulation (LES) turbulence model and a developed formulation of permeable FWeH method with an open source computational fluid dynamics (CFD) tool-kit. Noise around a circular cylinder is examined and the results of using the acoustic analogy method with and without quadrupole noise are compared, i.e. the FWeH method without quadrupole noise versus the permeable FWeH method that includes quadrupole sources. The usability of the permeable FWeH method for the prediction of turbulence-noise around submerged bodies is shown.
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