Simulations of Water-Air Flows With Low and High Pressure Ratios
| المصدر: | المجلة الجامعة |
|---|---|
| الناشر: | جامعة الزاوية - مركز البحوث والدراسات العليا |
| المؤلف الرئيسي: | Jolgam, Shaban (Author) |
| مؤلفين آخرين: | Ballil, Ahmed (Co-Author) , Nowakowsk, Andrew (Co-Author) |
| المجلد/العدد: | مج19, ع3 |
| محكمة: | نعم |
| الدولة: |
ليبيا |
| التاريخ الميلادي: |
2017
|
| الشهر: | يوليو |
| الصفحات: | 87 - 108 |
| رقم MD: | 1264151 |
| نوع المحتوى: | بحوث ومقالات |
| اللغة: | الإنجليزية |
| قواعد المعلومات: | EduSearch, EcoLink, IslamicInfo, AraBase, HumanIndex |
| مواضيع: | |
| كلمات المؤلف المفتاحية: |
Compressible Multiphase Flow | Hyperbolic Pdes | Riemann Problem | Godunov Methods | Shock Waves | HLL Riemann Solver
|
| رابط المحتوى: |
الناشر لهذه المادة لم يسمح بإتاحتها. |
| المستخلص: |
Numerical simulation of two phase flows, which includes interface creation and evolution, is a challenging task due to its complexity. In this contribution, simulations of water-air flows characterised by high and low pressure jumps across the interface are presented. A computer program using "C" language is developed to compute a fully non-equilibrium two-phase flow model. The model consists of seven partial differential equations in one dimensional flow as follows: mass, momentum and energy equations for each constituent augmented by a volume fraction evolution equation for one of the constituents. A diffuse interface numerical method is employed to capture the interface evolution in different water-air flow regimes. This method is based on an extended second order finite volume Godunov-type approach. A fixed Eulerian mesh is built and fluxes at each cell boundaries are computed using an efficient HLL approximate Riemann solver. Velocity and pressure relaxation procedures are applied to fulfill the interface conditions. Two case studies are considered to verify the developed code. The first case considers the water-air shock tube problem, which provides a high pressure ratio of (104) and the second test considers the water-faucet flow, which provides a low pressure ratio of (1). The obtained results show very good agreement with both the exact solutions and other published results. |
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