CFD Simulation of Turbulent Flow in Pipes Using Different Turbulent Models
| المصدر: | المجلة الجامعة |
|---|---|
| الناشر: | جامعة الزاوية - مركز البحوث والدراسات العليا |
| المؤلف الرئيسي: | Abosbaia, Alhadi A. (Author) |
| مؤلفين آخرين: | Elfaghi, Abdulhafid M. (Co-Author) , Almatbage, Omar A (Co-Author) |
| المجلد/العدد: | مج19, ع4 |
| محكمة: | نعم |
| الدولة: |
ليبيا |
| التاريخ الميلادي: |
2017
|
| الشهر: | ديسمبر |
| الصفحات: | 1 - 12 |
| رقم MD: | 1264542 |
| نوع المحتوى: | بحوث ومقالات |
| اللغة: | الإنجليزية |
| قواعد المعلومات: | EduSearch, EcoLink, IslamicInfo, AraBase, HumanIndex |
| مواضيع: | |
| كلمات المؤلف المفتاحية: |
Turbulent Flow | K-Omega Model | K-Epsilon Model | Centerline Velocity | Velocity Profile
|
| رابط المحتوى: |
الناشر لهذه المادة لم يسمح بإتاحتها. |
| المستخلص: |
In turbulent flow, the local velocities fluctuate in term of magnitude and directions, which will generate small vortices due to viscous shear stresses between neighboring fluid elements. Those vortices grow in size and merges together resulting in continues mixing of fluid particles hence the momentum will transfer within the fluid. K-omega and K-epsilon turbulence model were used to consider the effects of turbulence of the flow inside a pipe. At the pipe entrance the velocity profile values is equal to the inlet velocity, where the flow is still not fully developed that means velocity distribution still unchanged. This can be clearly seen from the increment of the centerline velocity values. After the flow is fully developed the centerline velocity reached its maximum value, at the downstream distance of two meter. The velocity profiles along the pipe axis of K-ε model shows more reasonable results with smooth curves than those of the K-ω model. Wall shearing velocity gradients predicted by K-ε model were smaller than that of K-ω model due to the higher Reynolds stress for the earlier model, whereas at the outlet the shearing velocity gradients were smaller for K-ω model. |
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