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[9000472.] رقم البحث : 9000472 - |
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NUMERICAL AND EXPERIMENTAL INVESTIGATION OF THE FLOW FIELD AROUND FINITE CYLINDERS PLACED ON A FLAT WALL: THE EFFECT OF FREE-END SHAPE / |
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قطاع الدراسات الهندسية / الهندسه الميكانيكيه |
| تخصص البحث : الهندسه الميكانيكيه |
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Engineering Research Journal \ / Vol. 36, No. 3 - July 2013 |
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عصام محمد أحمد وهبة ( wahbaessam@yahoo.com - 01225538171 ) |
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bluff body; circular cylinder; vortex shedding, turbulent flow, CFD, unsteady flow |
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Numerical and experimental study of the three-dimensional unsteady flow field around finite cylinders placed on a ground wall is presented. The effects of free-end shape reading flat, hemisphere and cone top of the circular cylinder are examined. The numerical results were obtained using the computational fluid dynamic (CFD) code, Fluent 6.3.26. The three-dimensional unsteady flow filed is investigated using unsteady Reynolds averaged Navier-Stokes (URANS) equation along with the four equations v2-f turbulence model. This turbulence model is implemented in the CFD code using User Defined Function (UDF) and User Defined Scalars (UDS). The measurements of surface pressure distribution around the bodies are presented. The cylinder has an aspect ratio of 1.33 (h/D = 1.33) and faces flow with Reynolds number of 1.7 x 105 based on free stream velocity and cylinder diameter. The results show that the top free surface of the models affects the flow field, such as the development of the wake structure, recirculation zone and the reattachment zone. The results indicate also that the hemispherical free end cylinder is subjected to the larger flow induced vibration while the cone free end is subjected to the lowest flow induced vibration |
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