Identification of concentrated structures in slightly compressible two-dimensional flows |
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| Affiliation: | 1. MAB, université Bordeaux 1, 351, cours de la Libération, 33405 Talence, France;2. MACS, université Valenciennes, le Mont Houy 59313 Valenciennes cedex 9, France;1. Laboratory SNIRM, Faculty of Physique, University of Sciences and Technology Houari Boumediene, BP 32, El Alia, Bab Ezzouar 16111, Algiers, Algeria;2. Ruder Bošković Institute, P.O. Box 1016, 41001 Zagreb, Croatia;1. Department of Biology, University Federico II, via Cintia, 80126 Napoli, Italy;2. Department of Science and Technologies, University of Naples Parthenope, 80143 Napoli, Italy;1. Department of Geology and Geophysics, Louisiana State University, Baton Rouge, LA 70803, USA;2. Museum of Natural Science, Louisiana State University, Baton Rouge, LA 70803, USA;3. Department of Earth Science, Rice University, Houston, TX 77005, USA;4. Department of Earth Science, University of California, Santa Barbara, CA 93106, USA;5. Univ Lyon, Université Claude Bernard Lyon 1, CNRS, ENTPE, UMR 5023 LEHNA, 69622 Villeurbanne, France;1. Constantine the Philosopher University, 949 74 Nitra, Slovakia;2. Research Institute of Animal Production, 951 41 Lužianky, Slovakia;3. Faculty Hospital Nitra, 949 01 Nitra, Slovakia;4. King Saud University, Department of Zoology, College of Science, Riyadh 11451, Saudi Arabia;5. Institute of Animal Reproduction and Food Research, 10-748 Olsztyn, Poland |
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| Abstract: | ![]()
In this paper, different vortex diagnostic methods are compared to obtain a better understanding of boundary layer influence on the transport of vortical structures involving a complete analysis of vorticity, the Vorticity Threshold Criterion (VTC), and the Weiss Criterion (WC). These three techniques are basically confronted to find a suitable understanding of all flow characteristics for a range of laminar to transitional Reynolds numbers. The computations on this dihedral plane are done using a 2D DNS method. The Weiss criterion, coming from the analysis of the incompressible Euler equations is validated and applied to low speed compressible flows (Mach number=0.2). |
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