این سایت در حال حاضر پشتیبانی نمی شود و امکان دارد داده های نشریات بروز نباشند
Journal of Applied Fluid Mechanics، جلد ۱۸، شماره ۲، صفحات ۴۵۰-۴۶۷
عنوان فارسی
چکیده فارسی مقاله
کلیدواژه‌های فارسی مقاله
عنوان انگلیسی Numerical Modal Analysis of the Correlation Between Spanwise Vortex Shedding and Far-field Aeolian Noise for Square and Circular Wall-mounted Cylinders
چکیده انگلیسی مقاله For square and circular finite wall-mounted cylinders (FWMCs) with an aspect ratio exceeding 10, the vortex shedding near the tip area leads to the generation of multiple tonal noises. The quantitative analysis of the spanwise distributions of the vortex modal energy with different frequencies was quite limited. This study employs dynamic mode decomposition to decompose the wake of FWMC into distinct frequencies to evaluate the modal energy distribution of pressure fluctuations at each frequency along the spanwise direction. Large eddy simulation combined with the Ffowcs Williams–Hawkings (FW–H) acoustics analogy is applied to a square and a circular FWMC with aspect ratio of 13.6 at a Reynolds number of 2.3 × 104. Two indicators to describe the spanwise energy contribution are proposed. The results reveal that, for square FWMC, the primary modal energy corresponding to Strouhal number ( St ) equal to 0.14 is concentrated below 30% of the cylinder height  owing to the 3D effect. A transition mode of  St ≈ 0.12 is identified in the midspan (0.3 L–0.7L ) without significant contribution to far-field noise spectrum. For circular FWMC, the modal energy is distributed over several frequencies, vortices cells corresponding to the main noise band (0.2 <St< 0.23) are distributed below 0.7 , and the vortices cells in the noise band of 0.15 <St < 0.19 distributed from the midspan to the upper part in a dispersed manner. The noise band with   St≈ 0.08 corresponds to tip-associated vortices gathering above 0.8 . 
کلیدواژه‌های انگلیسی مقاله Aeroacoustics,Finite wall-mounted cylinder,Dynamic Mode Decomposition,Spanwise energy distribution,Modal energy contribution
نویسندگان مقاله R. P. Jiang |
Key Laboratory of Aero-Acoustics of Ministry of Industry and Information Technology, Beihang University, Beijing 100191, China

P. Q. Liu |
Key Laboratory of Aero-Acoustics of Ministry of Industry and Information Technology, Beihang University, Beijing 100191, China

J. Zhang |
Sino-French Engineer School, Beihang University, Beijing 100191, China

H. Guo |
Key Laboratory of Aero-Acoustics of Ministry of Industry and Information Technology, Beihang University, Beijing 100191, China

نشانی اینترنتی https://www.jafmonline.net/article_2569_508560cd8745fae4ec580daba5f13d3f.pdf
فایل مقاله فایلی برای مقاله ذخیره نشده است
کد مقاله (doi)
زبان مقاله منتشر شده en
موضوعات مقاله منتشر شده
نوع مقاله منتشر شده
برگشت به: صفحه اول پایگاه   |   نسخه مرتبط   |   نشریه مرتبط   |   فهرست نشریات