| Titre : | Vortices and large - scale structures in a rough open - channel flow subjected to bed suction and injection (2012) |
| Auteurs : | Arindam Singha, Auteur ; Md. Abdullah Al Faruque, Auteur ; Ram Balachandar, Auteur |
| Type de document : | Article : texte imprimé |
| Dans : | Journal of engineering mechanics (Vol. 138 N° 5, Mai 2012) |
| Article en page(s) : | pp.491-501 |
| Note générale : | Mécanique appliquée |
| Langues : | Anglais |
| Tags : | Seepage Open channel flow Vortices Large-scale-structures Swirling strength Proper orthogonal decomposition |
| Résumé : | The effect of seepage (injection and suction) on the dynamics of vortices and large-scale structures in a rough open channel flow was examined experimentally. The velocity measurements in the open channel flow were carried out using particle image velocimetry. A swirling strength-based vortex identification algorithm was used to extract the location, size, and strength of vortices in the flow. Proper orthogonal decomposition (POD) was used to analyze the dynamics of large-scale structures in the flow. The results indicate that suction induces a greater change compared with an equivalent amount of injection on the open channel flow. Suction dampens the size and strength of the vortices compared to the no-seepage case. POD analysis indicates that seepage tends to introduce more small-scale structures in the flow and destroys the large-scale organized motion present otherwise in the flow. |
| ISSN : | 0733-9399 |
| En ligne : | http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29EM.1943-7889.0000354 |
