NUMERICAL CALCULATION OF THE SOUND PRODUCED BY THE WIND FLOW AROUND THE CYLINDER AND CORRECTION OF THE SOUND AMPLITUDE BY INCREASING THE LENGTH

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NAJAFIAN AREZOO; PARHIZKAR HAMID; GHASEMLOOY SAJAD; TARABI ABBAS

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Journal: Modares Mechanical Engineering Year:2018 | Volume:18 | Issue:3 Page(s): 440-450

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Title

NUMERICAL CALCULATION OF THE SOUND PRODUCED BY THE WIND FLOW AROUND THE CYLINDER AND CORRECTION OF THE SOUND AMPLITUDE BY INCREASING THE LENGTH

Author(s)

NAJAFIAN AREZOO | PARHIZKAR HAMID | GHASEMLOOY SAJAD | TARABI ABBAS | Issue Writer Certificate

Keywords

AEROACOUSTIC SIMULATIONQ1

FFOWCS-WILLIAMS & HAWKINGS MODELQ1

LARGE EDDY SIMULATIONQ1

SOUND PRESSURE LEVELQ2

Abstract

In the present study, the numerical solution of the Ansys Fluent software has been used to calculate the sound produced by the high-speed flow on a cylinder using the Lighthill acoustic analogy. The calculations were carried out on a cylinder (part of the landing gear) at a speed of 70 m/s (take-off and landing speeds of airliners). The problem is initially caried out as a regular unsteady numerical solution. During the solution, aerodynamic noise data sources are stored as inputs of acoustic analyzes in files. Then, by solving the acoustic equations, the volume of produced sound (in decibel) is calculated at points that are pre-defined as the microphone in the desired coordinates. The purpose of this study is to study the ability of Fluent solution to calculate the sound generated by the flow, in addition of using a method for estimating the amount of sound increase by increasing the length of the cylinder. In the other words, due to the timing of the numerical solution, one can calculate sound generated by small length cylinder, and then, using engineering approximation, it estimates the sound of the flow around the larger-length cylinder. After the necessary calculations, results are provided as SOUND PRESSURE LEVEL curves using the acoustic analogy and fourier spectral analysis. The results show that LARGE EDDY SIMULATION turbulence model is most appropriate model for acoustic simulations. Also, the approximate method for evaluating the effect of increasing the length of the cylinder is in good agreement with the experimental results.

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APA: Copy

NAJAFIAN, AREZOO, PARHIZKAR, HAMID, GHASEMLOOY, SAJAD, & TARABI, ABBAS. (2018). NUMERICAL CALCULATION OF THE SOUND PRODUCED BY THE WIND FLOW AROUND THE CYLINDER AND CORRECTION OF THE SOUND AMPLITUDE BY INCREASING THE LENGTH. MODARES MECHANICAL ENGINEERING, 18(3 ), 440-450. SID. https://sid.ir/paper/178940/en

Vancouver: Copy

NAJAFIAN AREZOO, PARHIZKAR HAMID, GHASEMLOOY SAJAD, TARABI ABBAS. NUMERICAL CALCULATION OF THE SOUND PRODUCED BY THE WIND FLOW AROUND THE CYLINDER AND CORRECTION OF THE SOUND AMPLITUDE BY INCREASING THE LENGTH. MODARES MECHANICAL ENGINEERING[Internet]. 2018;18(3 ):440-450. Available from: https://sid.ir/paper/178940/en

IEEE: Copy

AREZOO NAJAFIAN, HAMID PARHIZKAR, SAJAD GHASEMLOOY, and ABBAS TARABI, “NUMERICAL CALCULATION OF THE SOUND PRODUCED BY THE WIND FLOW AROUND THE CYLINDER AND CORRECTION OF THE SOUND AMPLITUDE BY INCREASING THE LENGTH,” MODARES MECHANICAL ENGINEERING, vol. 18, no. 3 , pp. 440–450, 2018, [Online]. Available: https://sid.ir/paper/178940/en

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