Characterization of Swirling Flows in a Partly Open Cylinder
سال انتشار: 1395
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 110
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شناسه ملی سند علمی:
JR_JAFM-9-6_050
تاریخ نمایه سازی: 3 بهمن 1400
چکیده مقاله:
A partly open vertical disk-cylinder system, with an annular top lid, is used to model numerically the characteristics of axisymmetric swirling flows with stagnation and associated flows reversal; commonly referred to as vortex breakdown. The flows are driven by the bottom disk uniform rotation and controlled by the competition between the no-slip and stress-free surface conditions applied at the top. Depending on the radial extent of the free surface, distinct regions of toroidal, corner and on-axis vortex type flows were identified and mapped into a state diagram then discussed. In addition, the impact of the cavity aspect ratio on the onset conditions of stagnation and breakdown was highlighted. Moreover, the study explored the influence of a diffusion driven meridian circulation, induced by the sidewall differential rotation, which is revealed to constitute an effective non intrusive kinematic means of flow control.
کلیدواژه ها:
نویسندگان
M. Imoula
Lab “LDMV”, University of Boumerdes / Algérie x
R. Saci
Lab “LDMV”, University of Boumerdes / Algérie x
B. Benkoussas
Lab “LDMV”, University of Boumerdes / Algérie x
R. Gatignol
Institut Jean Le Rond d’Alembert, Université Pierre et Marie Curie et CNRS, Paris ۰۵, France