Obstacle Geometry Effect on the Stability of Two-Dimensional Incompressible Flow in a Channel
سال انتشار: 1395
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 116
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شناسه ملی سند علمی:
JR_JAFM-9-2_012
تاریخ نمایه سازی: 5 بهمن 1400
چکیده مقاله:
Two-dimensional incompressible fluid flow around a rectangular shape placed over a larger rectangular shape is analyzed numerically. The vortex shedding is investigated at different arrangements of the two shapes. The calculations are carried out for several values of Reynolds numbers from low values up to ۵۲. At low Reynolds number, the flow remains steady. The flow characteristics are analyzed for each configuration. The analysis of the flow evolution shows that with increasing Re beyond a certain critical value, the flow becomes unstable and undergoes a bifurcation. It is observed that the transition to unsteady regime is performed by a Hopf bifurcation. The critical Reynolds number beyond which the flow becomes unsteady is determined for each configuration.
کلیدواژه ها:
Incompressible fluid flow ، obstacle ، Von Karman vortex street ، Finite ، volume method ، Critical Reynolds Number
نویسندگان
S. Fezai
University of Tunis El Manar, Faculty of Sciences of Tunis, Laboratory of fluid Mechanics, physics department, ۲۰۹۲, Tunis, Tunisia.
N. Ben-Cheikh
University of Tunis El Manar, Faculty of Sciences of Tunis, Laboratory of fluid Mechanics, physics department, ۲۰۹۲, Tunis, Tunisia.
B. Ben-Beya
University of Tunis El Manar, Faculty of Sciences of Tunis, Laboratory of fluid Mechanics, physics department, ۲۰۹۲, Tunis, Tunisia.
T. Lili
University of Tunis El Manar, Faculty of Sciences of Tunis, Laboratory of fluid Mechanics, physics department, ۲۰۹۲, Tunis, Tunisia.