Harikrishnan, A. P. and Ansorge, C. and Klein, R. and Vercauteren, N.
(2021)
*Lagrangian hairpins in atmospheric boundary layers.*
Gallery of Fluid Motion
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Official URL: https://doi.org/10.1103/APS.DFD.2021.GFM.P0018

## Abstract

In this poster, we have shown beautiful direct volume renders of finite-time Lyapunov exponent (FTLE) fields applied to a highly stratified Ekman flow. This flow describes the atmospheric boundary layer (ABL) over a smooth flat plate driven by a uniform pressure gradient and experiencing steady rotation in the wall-normal direction. An interesting result can be observed here. We note that hairpins extracted from different regions in the flow field are oriented in a similar direction i.e., the head of the hairpins point to a similar direction. These results are in-line with our previous observation with the Eulerian Q-criterion [1, 2]. For further details on FTLE, please refer to the work of [3, 4]. FTLE is sometimes referred in literature as direct Lyapunov exponent (DLE). The Reynolds number is described in terms of the geostrophic wind velocity (G), the laminar Ekman-layer depth (D) and the kinematic viscosity (ν) as Re = GD/ν.

Item Type: | Article |
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Additional Information: | Dfd 2021 74th Annual Meeting of the APS Division of Fluid Dynamics Phoenix, AZ - November 21, 2021 — November 23, 2021 Videos Now Available Videos for the 2021 Gallery of Fluid Motion are now available to view. |

Subjects: | Mathematical and Computer Sciences > Mathematics > Applied Mathematics |

Divisions: | Department of Mathematics and Computer Science > Institute of Mathematics > Geophysical Fluid Dynamics Group |

ID Code: | 2744 |

Deposited By: | Monika Drueck |

Deposited On: | 15 Feb 2022 18:37 |

Last Modified: | 02 Mar 2023 14:59 |

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