| Related citation: | Shuyan Wang,Miao Li,Shuqing Wang,Haoting Li,Yujia Chen,Yimei Ma,Qiji Sun.Fully Developed Turbulence of Power-Law Fluids in Circular Pipe Based on Large Eddy Simulation[J].Journal of Harbin Institute Of Technology(New Series),2021,28(4):67-76.DOI:10.11916/j.issn.1005-9113.19091. |
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| Author Name | Affiliation | | Shuyan Wang | School of Petroleum Engineering, Northeast Petroleum University, Daqing 163318, Heilongjiang，China
Key Laboratory of Enhanced Oil Recovery Northeast Petroleum University, Ministry of Education，Daqing 163318，Heilongjiang，China | | Miao Li | School of Petroleum Engineering, Northeast Petroleum University, Daqing 163318, Heilongjiang，China | | Shuqing Wang | The Fourth Oil Production Factory, Daqing Oilfield Corporation Ltd., Petro China, Daqing 163511, Heilongjiang，China | | Haoting Li | School of Petroleum Engineering, Northeast Petroleum University, Daqing 163318, Heilongjiang，China | | Yujia Chen | School of Petroleum Engineering, Northeast Petroleum University, Daqing 163318, Heilongjiang，China | | Yimei Ma | School of Petroleum Engineering, Northeast Petroleum University, Daqing 163318, Heilongjiang，China | | Qiji Sun | School of Petroleum Engineering, Northeast Petroleum University, Daqing 163318, Heilongjiang，China |
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| Abstract: |
| In this study, Large eddy simulation (LES) of the fully developed turbulence of power-law fluids in a circular pipe was performed using the dynamic subgrid-scale model. Under a specific Reynolds number, the flow information of three fluids with a range of power-law indexes was obtained. The trends of the mean axial velocity and the normalized apparent viscosity were analyzed. Simulation results show that shearing-thinning fluid displayed more noticeable non-Newtonian characteristics than shear-thickening fluid. The predicted friction factors were approximately equal to the Dodge and Metzner correlation and Gomes correlation. The peak values of root mean squares (RMS) and Reynolds stress increased as the power-law index increased. The turbulence statistics (skewness and flatness) from the wall to the pipe center were calculated. From the calculated results, the velocity fluctuation near the wall had strong intermittent and asymmetry. As demonstrated by the contours of the normalized instantaneous axial velocity and viscosity, the turbulence was more developed as the power-law index increased. It is concluded that the LES is feasible to predict the turbulence of pipe flow under higher Reynolds numbers. |
| Key words: Large eddy simulation power-law fluids fully developed turbulence |
| DOI：10.11916/j.issn.1005-9113.19091 |
| Clc Number:O357.5 |
| Fund: |
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| Descriptions in Chinese: |
| 幂律流体圆管湍流的大涡模拟 王淑彦1,2, 李淼1, 王树青3, 李好婷1, 陈羽佳1, 马一玫1, 孙启冀1 （1.东北石油大学 石油工程学院, 黑龙江 大庆 163318； 2.提高采收率教育部重点实验室（东北石油大学）, 黑龙江 大庆 163318； 3.中国石油大庆油田股份有限公司第四采油厂, 黑龙江 大庆 163511） 摘要：本文采用动态亚格子模型，对幂律流体在圆管内的充分发展湍流流动进行了大涡模拟（LES），得到了不同幂律指数下的湍流流动信息。文中分析了平均轴向速度、脉动速度均方根和雷诺应力等随着幂律指数增加的变化趋势，得出随着幂律指数的增加对数区的平均轴向速度减小，脉动速度均方根和雷诺应力的值增大，模拟结果表明剪切稀化流体比剪切稠化流体的非牛顿特征更明显。同时对湍流流动的高阶统计量（偏斜因子和平坦因子）进行了分析，结果表明随着幂律指数的减小，轴向脉动的偏斜因子和平坦因子在近壁面区增大，随着幂律指数的减小轴向脉动的间歇性和非对称性更强。不同幂律指数下的湍流流动变化明显，进一步说明了幂律指数对幂律流体的湍流流动有重要影响。模拟结果与直接数值模拟结果吻合较好，证实了大涡模拟可以用来预测较大雷诺数情况下幂律流体流动的湍流特性。 关键词：大涡模拟；幂律流体；充分发展湍流 |
