Characteristics of shear layer and primary vortex induced by solitary waves propagating over rectangular structures with different aspect ratios / Tsung-Chun Ho in Journal of engineering mechanics, Vol. 138 N° 9 (Septembre 2012)  

Public ISBD [article]  inJournal of engineering mechanics > Vol. 138 N° 9 (Septembre 2012) . - pp.1084–1100. Titre : Characteristics of shear layer and primary vortex induced by solitary waves propagating over rectangular structures with different aspect ratios Type de document : texte imprimé Auteurs : Tsung-Chun Ho, Auteur ; Chang Lin, Auteur ; Kao-Shu Hwang, Auteur Année de publication : 2012 Article en page(s) : pp.1084–1100. Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : Solitary wave Vortex shedding Shear layer Submerged structure Particle image velocimetry Flow visualization Aspect ratio Résumé : The flow characteristics induced by a solitary wave propagating over a submerged and bottom-mounted structure were studied experimentally using time-resolved particle image velocimetry (PIV) and particle trajectory photography for flow visualization. The setup for time-resolved PIV consisted of a high-speed camera and an argon-ion laser. Image processing techniques were utilized to improve both the temporal and spatial resolutions of the PIV system. The main parameters were wave steepness (H/h=0.16–0.38) and aspect ratios of the rectangular structures (L/D=0.14–11.1). The vortex shedding process near the trailing edge was divided into the following phases: the formation of the separated shear layer, generation of the vortices, vortex motion, and breakdown of the vortices. The motions of the primary vortex may differ depending on experimental parameters. By analyzing these motions, flow patterns were categorized into Types A, B, and C, and the conditions for these types were investigated. In the formation of the shear layer, the similarity profile was determined by selecting the proper length and velocity scales. The relationship between characteristic scales and nondimensional experimental parameters were also investigated. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29EM.1943-7889.0000420 [article] Characteristics of shear layer and primary vortex induced by solitary waves propagating over rectangular structures with different aspect ratios [texte imprimé] / Tsung-Chun Ho, Auteur ; Chang Lin, Auteur ; Kao-Shu Hwang, Auteur . - 2012 . - pp.1084–1100. Mécanique appliquée Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 138 N° 9 (Septembre 2012) . - pp.1084–1100. Mots-clés : Solitary wave Vortex shedding Shear layer Submerged structure Particle image velocimetry Flow visualization Aspect ratio Résumé : The flow characteristics induced by a solitary wave propagating over a submerged and bottom-mounted structure were studied experimentally using time-resolved particle image velocimetry (PIV) and particle trajectory photography for flow visualization. The setup for time-resolved PIV consisted of a high-speed camera and an argon-ion laser. Image processing techniques were utilized to improve both the temporal and spatial resolutions of the PIV system. The main parameters were wave steepness (H/h=0.16–0.38) and aspect ratios of the rectangular structures (L/D=0.14–11.1). The vortex shedding process near the trailing edge was divided into the following phases: the formation of the separated shear layer, generation of the vortices, vortex motion, and breakdown of the vortices. The motions of the primary vortex may differ depending on experimental parameters. By analyzing these motions, flow patterns were categorized into Types A, B, and C, and the conditions for these types were investigated. In the formation of the shear layer, the similarity profile was determined by selecting the proper length and velocity scales. The relationship between characteristic scales and nondimensional experimental parameters were also investigated. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29EM.1943-7889.0000420

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