Vortex Definition and Identification

A special issue of Fluids (ISSN 2311-5521). This special issue belongs to the section "Turbulence".

Deadline for manuscript submissions: 31 January 2026 | Viewed by 3280

Special Issue Editor


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Guest Editor
Department of Mathematics, University of Texas at Arlington, Arlington, TX 76019, USA
Interests: vortex; turbulence; DNS/LES; flow transition

Special Issue Information

Dear Colleagues,

Vortices are omnipresent in the universe and affect human life and the environment. A vortex is intuitively recognized as a rotational or swirling fluid motion and develops under diverse conditions. Examples are hurricanes and tornadoes, river and ocean currents, and recirculation and turbulence that develops in pipes and near airplane wings, to mention just a few. Biological organisms, moreover, use the principles behind vortex generation for propulsion and transport. Despite the importance of vortex structures in everyday life, we still do not fully understand vortex generation and its dynamics, and little is known about how to control vortices to avoid their potentially devastating adverse effects. This Special Issue aims to collect a series of papers on vortex definition, identification, and applications including subgrid models for LES, especially using new methods like Liutex and third-generation vortex definition and identification.

Prof. Dr. Chaoqun Liu
Guest Editor

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Keywords

  • vortex definition
  • identification
  • application
  • turbulence

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Published Papers (1 paper)

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Research

19 pages, 4608 KB  
Article
Experimental Study on the Influence of Groove-Flap and Concave Cavity on the Output Characteristics of Vertical Axis Wind Turbine
by Jiale Xue, Yongyan Chen, Li Song, Yifan Xing, Baiqiang Wang and Yansong Sun
Fluids 2025, 10(8), 208; https://doi.org/10.3390/fluids10080208 - 8 Aug 2025
Viewed by 282
Abstract
To address the low wind energy utilization efficiency of vertical axis wind turbines (VAWTs) and enhance their engineering applicability, cavity and groove-flap structures were incorporated into turbine blades. Numerical simulations were performed to optimize these configurations, followed by wind tunnel experiments investigating output [...] Read more.
To address the low wind energy utilization efficiency of vertical axis wind turbines (VAWTs) and enhance their engineering applicability, cavity and groove-flap structures were incorporated into turbine blades. Numerical simulations were performed to optimize these configurations, followed by wind tunnel experiments investigating output power variations of three VAWT types under different wind speeds at installation angles of 0°, 2°, 4°, and 6°. The Omega criterion was employed to comparatively analyze vortex evolution patterns at the leading and trailing edges for installation angles of 0°, 3°, and 5°. Experimental results demonstrated nonlinear growth in output power with increasing wind speed and rotational velocity, with groove-flap VAWTs exhibiting superior performance. The optimal installation angle was identified within 2.5–3.5°, where appropriate angles reduced adverse pressure gradients, delayed boundary layer separation, and mitigated vortex shedding effects. Excessive angles induced vortex accumulation and wake disturbances, compromising flow field stability. This study provides critical insights for optimizing VAWT aerodynamic performance through structural modifications and installation angle adjustments. Full article
(This article belongs to the Special Issue Vortex Definition and Identification)
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