Estimating thrust from shedding vortex surfaces in the wake of a flapping plate | |
Tong, Wenwen1; Yang, Yue1,2,3; Wang SZ(王士召)4,5 | |
Corresponding Author | Yang, Yue(yyg@pku.edu.cn) |
Source Publication | JOURNAL OF FLUID MECHANICS |
2021-06-04 | |
Volume | 920Pages:26 |
ISSN | 0022-1120 |
Abstract | We elucidate the vortex dynamics of flows past a flapping plate using the vortex-surface field (VSF) and develop models for estimating thrust from shedding vortex surfaces in wakes. The VSF evolution is calculated from numerical simulation using the immersed boundary method. The VSF visualization reveals that a spoon-like vortex surface dominated by tip vortex lines is formed and periodically shed into the wake owing to the alternating upstroke and downstroke of the flapping plate. We simplify the finite-domain impulse theory based on a particular vortex surface. The simplified theory demonstrates that the force on the plate is only dependent on the vortical impulse and Lamb-vector integral of the vortex surface enclosing the plate. Then, we propose a time-averaged thrust model from near-wake discrete vortex surfaces, where the incorporation of the Lamb-vector integral significantly improves the model estimation from the impulse model. Furthermore, we estimate the mean thrust based on two arbitrary vortex surfaces in the far wake from the linear impulse decay of periodically shedding vortex surfaces, which provides a possible approach to infer the state of the moving body in experimental investigation and practical applications. |
Keyword | vortex dynamics propulsion swimming/flying |
DOI | 10.1017/jfm.2021.434 |
Indexed By | SCI ; EI |
Language | 英语 |
WOS ID | WOS:000657855200001 |
WOS Keyword | FLUID DYNAMIC FORCES ; AERODYNAMIC FORCE ; LIFT ENHANCEMENT ; VELOCITY-FIELDS ; SWIMMING FISH ; TAYLOR-GREEN ; FREE-FLIGHT ; PERFORMANCE ; LOCOMOTION ; EVOLUTION |
WOS Research Area | Mechanics ; Physics |
WOS Subject | Mechanics ; Physics, Fluids & Plasmas |
Funding Project | National Natural Science Foundation of China[91952108] ; National Natural Science Foundation of China[11925201] ; National Natural Science Foundation of China[11988102] ; National Natural Science Foundation of China[91841302] |
Funding Organization | National Natural Science Foundation of China |
Classification | 一类/力学重要期刊 |
Ranking | 3 |
Contributor | Yang, Yue |
Citation statistics | |
Document Type | 期刊论文 |
Identifier | http://dspace.imech.ac.cn/handle/311007/86914 |
Collection | 非线性力学国家重点实验室 |
Affiliation | 1.Peking Univ, Coll Engn, State Key Lab Turbulence & Complex Syst, Beijing 100871, Peoples R China; 2.Peking Univ, CAPT, Beijing 100871, Peoples R China; 3.Peking Univ, BIC ESAT, Beijing 100871, Peoples R China; 4.Chinese Acad Sci, Inst Mech, LNM, Beijing 100190, Peoples R China; 5.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China |
Recommended Citation GB/T 7714 | Tong, Wenwen,Yang, Yue,Wang SZ. Estimating thrust from shedding vortex surfaces in the wake of a flapping plate[J]. JOURNAL OF FLUID MECHANICS,2021,920:26. |
APA | Tong, Wenwen,Yang, Yue,&王士召.(2021).Estimating thrust from shedding vortex surfaces in the wake of a flapping plate.JOURNAL OF FLUID MECHANICS,920,26. |
MLA | Tong, Wenwen,et al."Estimating thrust from shedding vortex surfaces in the wake of a flapping plate".JOURNAL OF FLUID MECHANICS 920(2021):26. |
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