Evaluation of subgrid-scale models in large-eddy simulations of turbulent flow in a centrifugal pump impeller
Evaluation of subgrid-scale models in large-eddy simulations of turbulent flow in a centrifugal pump impeller
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离心泵叶轮湍流大涡模拟中亚网格尺度模型的评估
DOI：
10.3901/cjme.2012.05.911
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发表时间：
2012-09
期刊：
影响因子：
--
通讯作者：
Fujun Wang
中科院分区：
文献类型：
--
作者：
Zhengjun Yang;Fujun Wang
目前对泵内湍流流动的大涡模拟研究主要集中在应用常规亚网格模型（SGS）模拟湍流流动，以获得泵内流场。SGS模型的选取往往考虑不周全，无法保证仿真的准确性和效率。利用CFD软件Fluent的用户自定义功能，对Smagorinsky-Lilly模型、动态Smagorinsky模型和动态混合模型三种SGS模型进行了数值模拟研究。对离心泵叶轮内部的湍流流动进行了数值模拟。模拟结果表明，采用粒子图像测速（PIV）和激光多普勒测速（LDV）技术对六叶闭式离心泵叶轮旋转通道内的流动进行了详细的测量，得到的平均流动与实验数据吻合较好。对比结果表明，动态混合模型对离心泵叶轮内的平均流量计算精度最高。将动力混合模型的SGS应力分解为尺度相似部分和涡粘性部分。SGS应力的尺度相似部分在泵叶片前缘和尾缘等高曲率区域起着重要作用。计算结果表明，动态混合模型更适合于计算叶轮内部的湍流。研究结果有助于提高离心泵大涡模拟的计算精度和效率，为同类流体机械的数值模拟提供了重要参考。
The current research of large eddy simulation (LES) of turbulent flow in pumps mainly concentrates in applying conventional subgrid-scale (SGS) model to simulate turbulent flow, which aims at obtaining the flow field in pump. The selection of SGS model is usually not considered seriously, so the accuracy and efficiency of the simulation cannot be ensured. Three SGS models including Smagorinsky-Lilly model, dynamic Smagorinsky model and dynamic mixed model are comparably studied by using the commercial CFD code Fluent combined with its user define function. The simulations are performed for the turbulent flow in a centrifugal pump impeller. The simulation results indicate that the mean flows predicted by the three SGS models agree well with the experimental data obtained from the test that detailed measurements of the flow inside the rotating passages of a six-bladed shrouded centrifugal pump impeller performed using particle image velocimetry (PIV) and laser Doppler velocimetry (LDV). The comparable results show that dynamic mixed model gives the most accurate results for mean flow in the centrifugal pump impeller. The SGS stress of dynamic mixed model is decompose into the scale similar part and the eddy viscous part. The scale similar part of SGS stress plays a significant role in high curvature regions, such as the leading edge and training edge of pump blade. It is also found that the dynamic mixed model is more adaptive to compute turbulence in the pump impeller. The research results presented is useful to improve the computational accuracy and efficiency of LES for centrifugal pumps, and provide important reference for carrying out simulation in similar fluid machineries.
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影响因子：
2.8
作者：
A. Posa;A. Lippolis;R. Verzicco;E. Balaras
通讯作者：
A. Posa;A. Lippolis;R. Verzicco;E. Balaras
DOI：
--
发表时间：
1991-03
期刊：
--
影响因子：
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作者：
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通讯作者：
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影响因子：
2
作者：
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影响因子：
3.2
作者：
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通讯作者：
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