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Experiments in Fluids
Published in: Experiments in Fluids 6/2020

01-06-2020 | Research Article

Experiments on asymmetric vortex pair interaction with the ground

Authors: Qingmin Chen, Tianxiang Hu, Peiqing Liu, Yue Liu, Qiulin Qu, Hao Guo, Rinie A. D. Akkermans

Published in: Experiments in Fluids | Issue 6/2020

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Abstract

The interaction between the asymmetric vortex pair and the ground was experimentally investigated in a closed-circuit water channel for the current study. Particle image velocimetry tests were conducted to achieve the velocity measurements of flow fields at various crossflow planes. The vortex pair, with the reference circulation Reynolds number ReΓ ≈ 4490, was tested with various initial heights (h0/b0 = 1.5, 1.0 and 0.5) and circulation ratios (λ = 0.36:1, 1:0.36, 0.6:1, 1:0.6), with it being found that according to different interaction effects, the trajectory and merger of the vortex pair could be significantly affected. As the primary vortex pair approached the ground, a high turbulent kinetic energy region was observed between the secondary and primary vortical structures, which suggests violent interaction and accelerated circulation decay of the primary vortex. In addition, depending on the distribution of secondary vorticity and image vortices to the moving coordinate system, merging-promoting or -inhibiting effects were observed, which eventually affected the evolution of the primary vortex pair.

Graphic abstract

previous article Visualization of laminar–turbulent transition on rotating turbine blades

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Metadata
Title
Experiments on asymmetric vortex pair interaction with the ground
Authors
Qingmin Chen
Tianxiang Hu
Peiqing Liu
Yue Liu
Qiulin Qu
Hao Guo
Rinie A. D. Akkermans
Publication date
01-06-2020
Publisher
Springer Berlin Heidelberg
Published in
Experiments in Fluids / Issue 6/2020
Print ISSN: 0723-4864
Electronic ISSN: 1432-1114
DOI
https://doi.org/10.1007/s00348-020-02987-7

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