Bulletin of the American Physical Society
76th Annual Meeting of the Division of Fluid Dynamics
Sunday–Tuesday, November 19–21, 2023; Washington, DC
Session ZC43: Turbulence: Buoyancy-Driven and Stratified II
12:50 PM–2:47 PM,
Tuesday, November 21, 2023
Room: 207B
Chair: Vishal Kumar, Argonne national laboratory; Miles Couchman, Department of Mathematics and Statistics, York University
Abstract: ZC43.00007 : The characteristics of the meandering effect in a stratified wake*
2:08 PM–2:21 PM
Presenter:
Xinyi Huang
(The California Institute of Technology)
Authors:
Xinyi Huang
(The California Institute of Technology)
Jiaqi Li
(The Pennsylvania State University)
Xiang Yang
(Pennsylvania State University)
In this work, we study the meandering effect by the decomposition of the stationary behavior and the pure meandering behavior. A large direct numerical simulation (DNS) database is set up for a wide range of Reynolds numbers and Froude numbers. The meandering effect can be characterized by extracting the center location from a large number of instantaneous snapshots. We find similar horizontal expansion in the meandering of the center location as in the size expansion of flow structures. We established self-similarity theory in the stratified wake and obtain the conservation law. We find that the meandering has little effect on changing the scaling of the mean velocity, but it is one of the main reasons for possible deviation from the Gaussian assumptions.
*We would like to acknowledge the office of naval research (ONR) which funds this work.
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