INVESTIGATION ON THE HYDRODYNAMIC PERFORMANCE OF A VERTICAL DOUBLE MANTA RAY GLIDING WITH VARIABLE ATTACK ANGLES
-
摘要: 为了探究垂向间距和攻角对双蝠鲼在沿垂向分布集群滑翔时的水动力性能影响, 根据蝠鲼的实际外形建立了蝠鲼计算模型, 设置了4种间距排布即0.25, 0.5, 0.75, 1倍体厚排布以及9种攻角状态即−8°~8°, 随后借助Fluent软件进行了双蝠鲼变攻角、变垂向间距的集群滑翔数值模拟, 结合流场压力云图以及速度云图对集群系统平均升/阻力以及集群中各单体的升/阻力进行了分析. 数值计算结果表明: 双蝠鲼沿垂向分布在攻角范围为−8°~8°进行集群滑翔时系统平均阻力均高于单体滑翔时所受阻力. 单体在集群滑翔过程中获得减阻收益, 当双蝠鲼以负攻角集群滑翔时, 下方蝠鲼阻力减小, 且垂向间距越小, 减阻效果越明显; 当以正攻角集群滑翔时, 上方蝠鲼获得减阻收益. 当双蝠鲼以负攻角滑翔时, 系统平均升力大于单体滑翔时所受升力; 当双蝠鲼以负攻角滑翔时, 系统平均升力小于单体滑翔时所受升力, 系统平均升力几乎不受垂向间距影响. 下方蝠鲼升力始终大于上方蝠鲼升力, 但随着垂向间距的增大, 升力差距逐渐减小.Abstract: In order to investigate the effects of vertical spacing and angle of attack on the hydrodynamic performance of double manta rays when gliding in clusters along the vertical distribution, a computational model of manta rays was developed based on the actual shape of manta rays. Four spacing arrangements, including 0.25, 0.5, 0.75 and 1 times the body thickness, and nine angle of attack states, namely −8°−8°, were set up. Then, the numerical simulation of the double manta ray with variable attack angle and vertical distance was carried out by Fluent software. The mean lift/drag of the system and the lift/drag of each individual in the cluster were analyzed by combining the flow field pressure and velocity clouds. Numerical calculations showed that the average drag of the two manta rays was higher than that of a single manta ray when they glided in groups with attack angles ranging from −8° to 8° in the vertical direction. When the two manta rays glide at negative attack angle, the drag of the lower manta ray decreases, and the smaller the vertical spacing, the more obvious the drag reduction effect is; when the two manta rays glide at positive attack angle, the upper manta ray gains drag reduction. When the two manta ray glide at negative attack angle, the system average lift is greater than that of the single glider; when the two manta rays glide at negative attack angle, the system average lift is less than that of the single glider, and the system average lift is almost independent of the vertical spacing. The lift of the lower manta ray is always greater than that of the upper manta ray, but the difference in lift decreases as the vertical spacing increases.
-
图 5 0.25TL垂向间距时不同攻角下的阻力/升力系数
Figure 5. Drag/lift coefficient at different attack angles at 0.25TL vertical distance
图 6 0.25TL垂向间距时不同攻角下的压力/速度云图
Figure 6. Pressure/velocity diagram at different attack angles at 0.25TL vertical distance
图 7 0.5TL垂向间距时不同攻角下的阻力/升力系数
Figure 7. Drag/lift coefficient at different attack angles at 0.5TL vertical distance
图 8 0.5TL垂向间距时不同攻角下的压力云图
Figure 8. Pressure diagram at different attack angles at 0.5TL vertical distance
图 9 0.75TL垂向间距时不同攻角下的阻力/升力系数
Figure 9. Drag/lift coefficient at different attack angles at 0.75TL vertical distance
图 10 0.75TL垂向间距时不同攻角下的压力云图
Figure 10. Pressure diagram at different attack angles at 0.75TL vertical distance
11 1TL垂向间距时不同攻角下的阻力/升力系数
11. Drag/lift coefficient at different attack angles at 1TL vertical distance
-
[1] Li L, Ravi S, Xie G, et al. Using a robotic platform to study the influence of relative tailbeat phase on the energetic costs of side-by-side swimming in fish. Proceedings of The Royal Society A Mathematical Physical and Engineering Sciences, 2021, 477(2249): 20200810 doi: 10.1098/rspa.2020.0810 [2] Weihs D. Hydromechanics of fish schooling. Nature, 1973, 241(5387): 290-291 doi: 10.1038/241290a0 [3] Chen SY, Fei YHJ, Chen YC, et al. The swimming patterns and energy-saving mechanism revealed from three fish in a school. Ocean Engineering, 2016, 122: 22-31 doi: 10.1016/j.oceaneng.2016.06.018 [4] Daghooghi M, Borazjani I. The hydrodynamic advantages of synchronized swimming in a rectangular pattern. Bioinspiration & Biomimetics, 2015, 10(5): 056018 [5] Deng J, Shao XM. Hydrodynamics in a diamond-shaped fish school. Journal of Hydrodynamics, Ser. B, 2006, 18(3): 438-442 doi: 10.1016/S1001-6058(06)60090-5 [6] Chung MH. Hydrodynamic performance of two-dimensional undulating foils in triangular formation. Journal of Mechanics, 2011, 27(2): 177-190 doi: 10.1017/jmech.2011.21 [7] Tian FB, Wang W, Wu J, et al. Swimming performance and vorticity structures of a mother-calf pair of fish. Computers & Fluids, 2016, 124: 1-11 [8] Gazzola M, Tchieu AA, Alexeev D, et al. Learning to school in the presence of hydrodynamic interactions. Journal of Fluid Mechanics, 2016, 789: 726-749 doi: 10.1017/jfm.2015.686 [9] Novati G, Verma S, Alexeev D, et al. Synchronisation through learning for two self-propelled swimmers. Bioinspiration & Biomimetics, 2017, 12(3): 036001 [10] 王亮. 仿生鱼群自主游动及控制的研究. [ 博士论文 ]. 南京: 河海大学, 2007Wang Liang. Numerical simulation and control of self-propelled swimming of bionics fish school. [PhD Thesis]. Nanjing: Hehai University, 2007 (in Chinese) [11] Li S, Li C, Xu L, et al. Numerical simulation and analysis of fish-like robots swarm. Applied Sciences, 2019, 9(8): 1652 doi: 10.3390/app9081652 [12] Lin X, Wu J, Zhang T, et al. Self-organization of multiple self-propelling flapping foils: energy saving and increased speed. Journal of Fluid Mechanics, 2020, 884: R1 [13] Lin X, He G, He X, et al. Hydrodynamic studies on two wiggling hydrofoils in an oblique arrangement. Acta Mechanica Sinica, 2018, 34(3): 446-451 doi: 10.1007/s10409-017-0732-1 [14] Lin X, He G, He X, et al. Dynamic response of a semi-free flexible filament in the wake of a flapping foil. Journal of Fluids and Structures, 2018, 83: 40-53 doi: 10.1016/j.jfluidstructs.2018.08.009 [15] Lin X, Wu J, Zhang T, et al. Phase difference effect on collective locomotion of two tandem autopropelled flapping foils. Physical Review Fluids, 2019, 4(5): 054101 doi: 10.1103/PhysRevFluids.4.054101 [16] Dewey PA, Boschitsch BM, Moored KW, et al. Scaling laws for the thrust production of flexible pitching panels. Journal of Fluid Mechanics, 2013, 732: 29-46 doi: 10.1017/jfm.2013.384 [17] Dewey PA, Quinn DB, Boschitsch BM, et al. Propulsive performance of unsteady tandem hydrofoils in a side-by-side configuration. Physics of Fluids, 2014, 26(4): 041903 doi: 10.1063/1.4871024 [18] Boschitsch BM, Dewey PA, Smits AJ. Propulsive performance of unsteady tandem hydrofoils in an in-line configuration. Physics of Fluids, 2014, 26(5): 051901 doi: 10.1063/1.4872308 [19] Ryuh YS, Yang GH, Liu J, et al. A school of robotic fish for mariculture monitoring in the sea coast. Journal of Bionic Engineering, 2015, 12(1): 37-46 doi: 10.1016/S1672-6529(14)60098-6 [20] Becker AD, Masoud H, Newbolt JW, et al. Hydrodynamic schooling of flapping swimmers. Nature Communications, 2015, 6(1): 1-8 [21] 裴正楷, 刘俊恺, 陈世明等. 双鱼并排游动时水动力性能研究. 测控技术, 2016, 35(12): 16-20 (Pei ZhengKai, Liu JunKai, Chen ShiMing, et al. Hydrodynamic performance of Beas swimming side by side. Measurement and Control Technology, 2016, 35(12): 16-20 (in Chinese) doi: 10.19708/j.ckjs.2016.12.004 [22] Vicsek T, Zafeiris A. Collective motion. Physics Reports, 2012, 517(3-4): 71-140 doi: 10.1016/j.physrep.2012.03.004 [23] Graham RT, Witt MJ, Castellanos DW, et al. Satellite tracking of manta rays highlights challenges to their conservation. PloS One, 2012, 7(5): e36834 doi: 10.1371/journal.pone.0036834 [24] Tangorra JL, Davidson SN, Hunter IW, et al. The development of a biologically inspired propulsor for unmanned underwater vehicles. IEEE Journal of Oceanic Engineering, 2007, 32(3): 533-550 doi: 10.1109/JOE.2007.903362 [25] Fish FE, Schreiber CM, Moored KW, et al. Hydrodynamic performance of aquatic flapping: efficiency of underwater flight in the manta. Aerospace, 2016, 3(3): 20 doi: 10.3390/aerospace3030020 [26] Borazjani I, Sotiropoulos F. Numerical investigation of the hydrodynamics of carangiform swimming in the transitional and inertial flow regimes. Journal of Experimental Biology, 2008, 211: 1541-1558 doi: 10.1242/jeb.015644 [27] Borazjani I, Sotiropoulos F. Numerical investigation of the hydrodynamics of anguilliform swimming in the transitional and inertial flow regimes. Journal of Experimental Biology, 2009, 211(10): 576-592 [28] 张栋. 牛鼻鲼游动过程中柔性变形对水动力影响研究. [ 博士学位论文 ]. 西安: 西北工业大学, 2020Zhang Dong. Flexible deformation effect on the hydrodynamic performance of a rhinoptera javanica in different swimming behaviors. [PhD Thesis]. Xi’an: Northwestern Polytechnical University, 2020 (in Chinese)) [29] Han P, Pan Y, Liu G, et al. Propulsive performance and vortex wakes of multiple tandem foils pitching in-line. Journal of Fluids and Structures, 2022, 108: 103422 doi: 10.1016/j.jfluidstructs.2021.103422 [30] Zarruk GA, Brandner PA, Pearce BW, et al. Experimental study of the steady fluid-structure interaction of flexible hydrofoils. Journal of Fluids and Structures, 2014, 51: 326-343 doi: 10.1016/j.jfluidstructs.2014.09.009 -
下载:
点击查看大图
图(13)
计量
- 文章访问数: 508
- HTML全文浏览量: 166
- PDF下载量: 103
- 被引次数: 0
