Abstract
Varieties of research on turbulent-induced noise are conducted with combinations of acoustic analogy methods and computational fluid dynamic methods to analyse efficiently and accurately. Application of FW-H acoustic analogy without turbulent noise is the most popular method due to its calculation cost. In this paper, turbulent-induced noise is predicted using RANS turbulence model and permeable FW-H method. For simplicity, noise from 2D cylinder is examined using three different methods: direct method of RANS, FW-H method without turbulent noise and permeable FW-H method which can take into account of turbulent-induced noise. Turbulent noise was well predicted using permeable FW-H method with same computational cost of original FW-H method. Also, ability of permeable FW-H method to predict highly accurate turbulent-induced noise by applying adequate permeable surface is presented. The procedure to predict turbulent- induced noise using permeable FW-H is established and its usability is shown.
Highlights
Objects in motion in fluid disturb its surroundings to produce noise
Direct method to directly extract perturbing pressure, FW-H method without quadruple term, and permeable FW-H which includes the effects of turbulence are compared for 2-dimensional circular cylinder
The results shows good results except the results at receiver 1 which is inside the permeable surface
Summary
Objects in motion in fluid disturb its surroundings to produce noise Such noise can be predicted using Kirchhoff formula or Acoustic analogy [1]. The Acoustic analogy method has advantage over Kirchhoff formula due to its representation of noise in three pressure terms according to its physical meanings: thickness noise, loading noise and quadruple noise [2]. The turbulent-induced noise can be predicted correctly using DNS (Direct Numerical Simulation) method. It is almost impossible because of high computational cost [4] [5]. Direct method to directly extract perturbing pressure, FW-H method without quadruple term, and permeable FW-H which includes the effects of turbulence are compared for 2-dimensional circular cylinder. It is shown that careful selection of permeable surface can result in high accuracy from permeable FW-H method
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