Tilting of vortex rings in the oblique collision reduces the longitudinal quadrupole and octupole modes of aerodynamic sound
文献类型：期刊论文
| 作者 | Zang ZY(臧振宇)1,2; Zhou ZT(周志腾)1,2; Liu Y(刘毅)1,2; Wang SZ(王士召)1,2 |
| 刊名 | JOURNAL OF FLUID MECHANICS
 |
| 出版日期 | 2025-07-11 |
| 卷号 | 1015页码:49 |
| 关键词 | aeroacoustics vortex dynamics |
| ISSN号 | 0022-1120 |
| DOI | 10.1017/jfm.2025.10264 |
| 通讯作者 | Wang, Shizhao(wangsz@lnm.imech.ac.cn) |
| 英文摘要 | The aerodynamic sound generated by the oblique collision of two vortex rings is featured by the asymmetric emission associated with the octupole mode, which differs from the symmetric emission associated with the quadrupole mode observed in the coaxial collision of two vortex rings. This distinctive feature of aerodynamic sound is closely related to the tilting and reconnecting of the vortex rings. While previous studies have explored the effects of reconnecting on aerodynamic sound, this study specifically addresses the impact of vortex ring tilting. We propose a novel vortex sound formula to quantitatively assess the role of tilting in aerodynamic sound generation. The proposed formula relates the far-field sound pressure to equivalent circulations and vorticity centroids by referring to Truesdell's consistency conditions for vorticity moments. The variations of the equivalent circulations and vorticity centroids in the oblique collision of two vortex rings under different configurations are analysed based on the numerical solution of the Navier-Stokes equations in the source region. It is found that the tilting of vortex rings results in a rapid change of the equivalent circulation associated with the vorticity in the collision direction. However, the change caused by titling is almost out of phase with that caused by reconnecting and deforming. The vortex tilting significantly reduces the aerodynamic sound associated with the longitudinal quadrupole and octupole modes, which is opposite to the role of vortex reconnecting that was reported in the oblique collision of vortex rings. |
| 分类号 | 一类/力学重要期刊 |
| WOS关键词 | HEAD-ON COLLISION ; GENERATION ; DYNAMICS |
| 资助项目 | NSFC Basic Science Center Program for 'Multiscale Problems in Nonlinear Mechanics'[11988102] ; National Natural Science Foundation of China[92252203] ; National Natural Science Foundation of China[12102439] ; Chinese Academy of Sciences Project for Young Scientists in Basic Research[YSBR-087] ; Strategic Priority Research Program of Chinese Academy of Sciences[XDB0620102] |
| WOS研究方向 | Mechanics ; Physics |
| 语种 | 英语 |
| WOS记录号 | WOS:001525814500001 |
| 资助机构 | NSFC Basic Science Center Program for 'Multiscale Problems in Nonlinear Mechanics' ; National Natural Science Foundation of China ; Chinese Academy of Sciences Project for Young Scientists in Basic Research ; Strategic Priority Research Program of Chinese Academy of Sciences |
| 其他责任者 | 王士召 |
| 源URL | [http://dspace.imech.ac.cn/handle/311007/102038]  |
| 专题 | 力学研究所_非线性力学国家重点实验室 |
| 作者单位 | 1.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China; 2.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zang ZY,Zhou ZT,Liu Y,et al. Tilting of vortex rings in the oblique collision reduces the longitudinal quadrupole and octupole modes of aerodynamic sound[J]. JOURNAL OF FLUID MECHANICS,2025,1015:49. |
| APA | 臧振宇,周志腾,刘毅,&王士召.(2025).Tilting of vortex rings in the oblique collision reduces the longitudinal quadrupole and octupole modes of aerodynamic sound.JOURNAL OF FLUID MECHANICS,1015,49. |
| MLA | 臧振宇,et al."Tilting of vortex rings in the oblique collision reduces the longitudinal quadrupole and octupole modes of aerodynamic sound".JOURNAL OF FLUID MECHANICS 1015(2025):49. |
入库方式： OAI收割
来源：力学研究所
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