The effect of free surface on the vortex shedding from inclined circular cylinders / P. P. Vlachos in Transactions of the ASME . Journal of fluids engineering, Vol. 130 N° 2 (Fevrier 2008)  

Public ISBD [article]  inTransactions of the ASME . Journal of fluids engineering > Vol. 130 N° 2 (Fevrier 2008) . - 9 p. Titre : The effect of free surface on the vortex shedding from inclined circular cylinders Type de document : texte imprimé Auteurs : P. P. Vlachos, Auteur ; D. P. Telionis, Auteur Année de publication : 2009 Article en page(s) : 9 p. Note générale : Fluids engineering Langues : Anglais (eng) Mots-clés : Flow (dynamics)  measurement  flow visualization  wakes  bubbles  vortices  cylinders  laser doppler anemometry  vortex shedding  hydrogen  circular particle Résumé : Spectral analysis of laser Doppler velocimetry measurements and flow visualization are employed to study the wake of inclined cylinders piercing a free surface. The results indicate that the free surface affects vortex shedding almost two to three cylinder diameters below the free surface. Variation of the vortex axis inclination and cells of shedding were visually observed. These effects induce a phase difference in the vortex-shedding mechanism. Streamwise vortical structures are formed along the primary vortex axis. Furthermore, for the case of the highest Froude number, evidence is provided that vortex shedding is suppressed in the region near the free surface. En ligne : http://fluidsengineering.asmedigitalcollection.asme.org/issue.aspx?journalid=122 [...] [article] The effect of free surface on the vortex shedding from inclined circular cylinders [texte imprimé] / P. P. Vlachos, Auteur ; D. P. Telionis, Auteur . - 2009 . - 9 p. Fluids engineering Langues : Anglais (eng) in Transactions of the ASME . Journal of fluids engineering > Vol. 130 N° 2 (Fevrier 2008) . - 9 p. Mots-clés : Flow (dynamics)  measurement  flow visualization  wakes  bubbles  vortices  cylinders  laser doppler anemometry  vortex shedding  hydrogen  circular particle Résumé : Spectral analysis of laser Doppler velocimetry measurements and flow visualization are employed to study the wake of inclined cylinders piercing a free surface. The results indicate that the free surface affects vortex shedding almost two to three cylinder diameters below the free surface. Variation of the vortex axis inclination and cells of shedding were visually observed. These effects induce a phase difference in the vortex-shedding mechanism. Streamwise vortical structures are formed along the primary vortex axis. Furthermore, for the case of the highest Froude number, evidence is provided that vortex shedding is suppressed in the region near the free surface. En ligne : http://fluidsengineering.asmedigitalcollection.asme.org/issue.aspx?journalid=122 [...]

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