Effect of transitions on flow past a square cylinder at low reynolds number / Saha, Arun K. in Journal of engineering mechanics, Vol. 135 N° 8 (Août 2009)  

Public ISBD [article]  inJournal of engineering mechanics > Vol. 135 N° 8 (Août 2009) . - pp. 839-851 Titre : Effect of transitions on flow past a square cylinder at low reynolds number Type de document : texte imprimé Auteurs : Saha, Arun K., Auteur Article en page(s) : pp. 839-851 Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : Three-dimensional flow Cylinders Wakes Flow simulation Vortex shedding Secondary Reynolds number. Résumé : Numerical simulations have been performed for three-dimensional flow past a square cylinder. The cylinders are placed normal to the incoming uniform flow. The results are based on higher order spatial and temporal discretization. The computations are carried out for a range of Reynolds number (100-325). The flow is found to be two-dimensional at R=160 while it becomes three-dimensional at R=163.5. Both Mode-A and Mode-A* are observed to be quite prominent and distinct at R=175 though they are present in a range of Reynolds number. The spanwise wavelength for Mode-A is higher than at R=250 where finer-scale structures are observed called Mode-B. The decay rate for primary vortices in Mode-A* is the fastest and it is the lowest for Mode-B. The magnitude of secondary vortices of Mode-A* is quite high compared to Mode-A, but of comparable magnitude to Mode-B. The effect of transitions on the instantaneous flow and root mean square fluctuations are quite significant while the time-averaged flow does not show any noticeable variation. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.aip.org/vsearch/servlet/VerityServlet?KEY=JENMDT&smode=strres [...] [article] Effect of transitions on flow past a square cylinder at low reynolds number [texte imprimé] / Saha, Arun K., Auteur . - pp. 839-851. Mécanique appliquée Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 135 N° 8 (Août 2009) . - pp. 839-851 Mots-clés : Three-dimensional flow Cylinders Wakes Flow simulation Vortex shedding Secondary Reynolds number. Résumé : Numerical simulations have been performed for three-dimensional flow past a square cylinder. The cylinders are placed normal to the incoming uniform flow. The results are based on higher order spatial and temporal discretization. The computations are carried out for a range of Reynolds number (100-325). The flow is found to be two-dimensional at R=160 while it becomes three-dimensional at R=163.5. Both Mode-A and Mode-A* are observed to be quite prominent and distinct at R=175 though they are present in a range of Reynolds number. The spanwise wavelength for Mode-A is higher than at R=250 where finer-scale structures are observed called Mode-B. The decay rate for primary vortices in Mode-A* is the fastest and it is the lowest for Mode-B. The magnitude of secondary vortices of Mode-A* is quite high compared to Mode-A, but of comparable magnitude to Mode-B. The effect of transitions on the instantaneous flow and root mean square fluctuations are quite significant while the time-averaged flow does not show any noticeable variation. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.aip.org/vsearch/servlet/VerityServlet?KEY=JENMDT&smode=strres [...]

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