Shallow-flow visualization analysis by proper orthogonal decomposition / Wernher Brevis in Journal of hydraulic research, Vol. 49 N° 5 (Septembre/Octobre 2011)  

Public ISBD [article]  inJournal of hydraulic research > Vol. 49 N° 5 (Septembre/Octobre 2011) . - pp. 586-594 Titre : Shallow-flow visualization analysis by proper orthogonal decomposition Type de document : texte imprimé Auteurs : Wernher Brevis, Auteur ; Manuel García-Villalba, Auteur Année de publication : 2011 Article en page(s) : pp. 586-594 Note générale : Hydraulique Langues : Anglais (eng) Mots-clés : Coherent structure Cylinder wake Flow visualization POD Shallow flow Index. décimale : 627 Ingénierie des cours d'eau naturels, des ports, des rades et des cotes. Installations de navigation, de dragage, de récupération et de sauvetage. Barrages et centrales électriques hydrauliques Résumé : The identification of the spatial characteristics and the shedding frequencies of coherent structures in shallow flows usually involves the use of sophisticated equipment for velocity measurements such as laser Doppler anemometry or particle image velocimetry. In this work, a simple and low-cost alternative for the quantitative characterization of quasi two-dimensional shallow coherent structures is presented. The technique is based on the image pre-processing of flow visualizations and post-processing by means of the proper orthogonal decomposition. As an illustration of the method, the analysis of a shallow flow in the wake of a cylinder with a vortex-street pattern is presented. The method is able to discriminate concentration patches attached to the vortices and their advection, providing frequencies in excellent agreement with a previous study. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/abs/10.1080/00221686.2011.585012 [article] Shallow-flow visualization analysis by proper orthogonal decomposition [texte imprimé] / Wernher Brevis, Auteur ; Manuel García-Villalba, Auteur . - 2011 . - pp. 586-594. Hydraulique Langues : Anglais (eng) in Journal of hydraulic research > Vol. 49 N° 5 (Septembre/Octobre 2011) . - pp. 586-594 Mots-clés : Coherent structure Cylinder wake Flow visualization POD Shallow flow Index. décimale : 627 Ingénierie des cours d'eau naturels, des ports, des rades et des cotes. Installations de navigation, de dragage, de récupération et de sauvetage. Barrages et centrales électriques hydrauliques Résumé : The identification of the spatial characteristics and the shedding frequencies of coherent structures in shallow flows usually involves the use of sophisticated equipment for velocity measurements such as laser Doppler anemometry or particle image velocimetry. In this work, a simple and low-cost alternative for the quantitative characterization of quasi two-dimensional shallow coherent structures is presented. The technique is based on the image pre-processing of flow visualizations and post-processing by means of the proper orthogonal decomposition. As an illustration of the method, the analysis of a shallow flow in the wake of a cylinder with a vortex-street pattern is presented. The method is able to discriminate concentration patches attached to the vortices and their advection, providing frequencies in excellent agreement with a previous study. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/abs/10.1080/00221686.2011.585012

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