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Long Time Evolution of Optimally Perturbed Wing-Tip Vortices


     

文集名：Advances in Heat Transfer and Fluid Dynamics - Select Proceedings of AHTFD 2022
作者：Mohd Suhail Naim（Department of Aerospace Engineering, Indian Institute of Technology Kanpur）
Navrose（Department of Aerospace Engineering, Indian Institute of Technology Kanpur）
会议名：1st International Conference on Heat Transfer and Fluid Dynamics (AHTFD 22)
会议日期：1-3 December 2022
会议地点：Aligarh, India
出版年：2024
页码：111-117
总页数：7
馆藏号：352186
分类号：TK124-53/I61/(1st)
语种：eng
文摘：We numerically investigate the effectiveness of optimal perturbations in exciting instabilities in the wake of flow past a finite aspect ratio wing at Re=1000. Analysis of the long-term evolution of perturbed wing-tip vortices is done in a frame of reference that moves roughly at the speed of the perturbation (～ U_∞; free stream speed). We simulate the scenarios in which the optimal perturbation is periodically injected into the wake. The wing-tip vortices displacement in response to the perturbation serves as a model for the actual perturbation. The maximum displacement experienced by perturbed wing-tip vortices as a function of time is analysed. The maximum displacement displays short time growth (up to 10-time units) after initial decay for the scenario where a single perturbation is present over a length of ～8b (where 'b' is the separation between the wing-tip vortices at x = 50c(c: chord length) from the leading edge of the finite wing in the wake) along the wing-tip vortices. Additionally, the impact of altering the spacing between the wing-tip vortices has been investigated. When the separation is reduced to ～0.37b, the initial rate of decay of maximum displacement slows down by ～ 40%. Increased perturbations and further narrowing of the space between the wing-tip vortices are predicted to produce intriguing findings.