The generation of aerodynamic sound by the interaction of flow at a Reynolds number of 150 and a Mach number of 0.2 with a rigid square cylinder attached to a rigid thin flat plate is numerically investigated. When the length of the plate is varied from L = 0.5D to 6D, where D is the side length of the square cylinder, the results can be grouped into three distinct regimes. For the first regime (L less than or similar to D), the sound levels decrease with increasing plate length. A 3 dB sound reduction is obtained when the length of the plate is D. For the second regime (1.25D less than or similar to L less than or similar to 4.75D), the sound levels increase with increasing plate length. For the third regime (5D less than or similar to L less than or similar to 6D), the sound levels decrease as the length of the plate increases but the levels are higher than for the other regimes. Results also show that the lift fluctuation is the dominant sound source. These acoustic results can be explained in terms of the fluid mechanics occurring in the near wake of the cylinder. (C) 2011 Elsevier Ltd. All rights reserved.
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Univ Teknol Malaysia, Malaysia Japan Int Inst Technol, Kuala Lumpur 54100, MalaysiaUniv Teknol Malaysia, Malaysia Japan Int Inst Technol, Kuala Lumpur 54100, Malaysia
Ali, Mohamed Sukri Mat
Doolan, Con J.
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Univ Adelaide, Sch Mech Engn, Adelaide, SA 5005, AustraliaUniv Teknol Malaysia, Malaysia Japan Int Inst Technol, Kuala Lumpur 54100, Malaysia
Doolan, Con J.
Wheatley, Vincent
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Univ Queensland, Sch Mech & Min Engn, Brisbane, Qld 4072, AustraliaUniv Teknol Malaysia, Malaysia Japan Int Inst Technol, Kuala Lumpur 54100, Malaysia
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Univ Teknol Malaysia, Malaysia Japan Int Inst Technol, Kuala Lumpur 54100, MalaysiaUniv Teknol Malaysia, Malaysia Japan Int Inst Technol, Kuala Lumpur 54100, Malaysia
Ali, Mohamed Sukri Mat
Abu, Aminudin
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Univ Teknol Malaysia, Malaysia Japan Int Inst Technol, Kuala Lumpur 54100, MalaysiaUniv Teknol Malaysia, Malaysia Japan Int Inst Technol, Kuala Lumpur 54100, Malaysia
Abu, Aminudin
Doolan, Con J.
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Univ New S Wales, Sch Mech & Mfg Engn, Sydney, NSW 2052, AustraliaUniv Teknol Malaysia, Malaysia Japan Int Inst Technol, Kuala Lumpur 54100, Malaysia
Doolan, Con J.
Porteous, Ric Zong-Yang
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Univ Adelaide, Sch Mech Engn, Adelaide, SA 5005, AustraliaUniv Teknol Malaysia, Malaysia Japan Int Inst Technol, Kuala Lumpur 54100, Malaysia
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Univ Teknol Malaysia, Malaysia Japan Int Inst Technol, Kuala Lumpur 54100, MalaysiaUniv Teknol Malaysia, Malaysia Japan Int Inst Technol, Kuala Lumpur 54100, Malaysia
Ali, Mohamed Sukri Mat
Doolan, Con J.
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Univ Adelaide, Sch Mech Engn, Adelaide, SA 5005, AustraliaUniv Teknol Malaysia, Malaysia Japan Int Inst Technol, Kuala Lumpur 54100, Malaysia
Doolan, Con J.
Wheatley, Vincent
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Univ Queensland, Sch Mech & Min Engn, Brisbane, Qld 4072, AustraliaUniv Teknol Malaysia, Malaysia Japan Int Inst Technol, Kuala Lumpur 54100, Malaysia
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Univ Teknol Malaysia, Malaysia Japan Int Inst Technol, Kuala Lumpur 54100, MalaysiaUniv Teknol Malaysia, Malaysia Japan Int Inst Technol, Kuala Lumpur 54100, Malaysia
Ali, Mohamed Sukri Mat
Abu, Aminudin
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Univ Teknol Malaysia, Malaysia Japan Int Inst Technol, Kuala Lumpur 54100, MalaysiaUniv Teknol Malaysia, Malaysia Japan Int Inst Technol, Kuala Lumpur 54100, Malaysia
Abu, Aminudin
Doolan, Con J.
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Univ New S Wales, Sch Mech & Mfg Engn, Sydney, NSW 2052, AustraliaUniv Teknol Malaysia, Malaysia Japan Int Inst Technol, Kuala Lumpur 54100, Malaysia
Doolan, Con J.
Porteous, Ric Zong-Yang
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Univ Adelaide, Sch Mech Engn, Adelaide, SA 5005, AustraliaUniv Teknol Malaysia, Malaysia Japan Int Inst Technol, Kuala Lumpur 54100, Malaysia