北京航空航天大学学报 ›› 2009, Vol. 35 ›› Issue (12): 1417-1420.

• 论文 • 上一篇    下一篇

聚合物槽道湍流的直接数值模拟

张劲柏, 郑昭虎   

  1. 北京航空航天大学 航空科学与工程学院, 北京 100191
  • 收稿日期:2008-12-05 出版日期:2009-12-31 发布日期:2010-09-14
  • 作者简介:张劲柏(1972-),男,江西吉安人,讲师, zhangjb@buaa.edu.cn.
  • 基金资助:

    国家自然科学基金资助项目(10272105,10602006)

Direct numerical simulation of turbulent channel flow of polymer solution

Zhang Jinbai, Zheng Zhaohu   

  1. School of Aeronautic Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China
  • Received:2008-12-05 Online:2009-12-31 Published:2010-09-14

摘要: 应用直接数值模拟方法研究了聚合物对槽道湍流的减阻特性.数值计算方法采用谱方法,时间积分采用二阶精度的时间分裂格式.应用FENE-P模型对聚合物槽道湍流进行定压降的直接数值模拟计算,揭示了聚合物湍流减阻的启动(onset)现象;应用O-B模型进行定流量的直接数值模拟计算,分析了其流动特征.计算结果表明:在低减阻形式中聚合物对湍流的影响主要发生在壁面区,而高减阻形式中聚合物对湍流的影响则遍及全流场.

Abstract: The drag reduction characteristic of polymer turbulence in channel flows was investigated using the direct numerical simulation (DNS). In the simulations, the spectral methods employing Fourier series and Chebyshev polynomial were used to make the spatial discretization and the time-splitting method with second-order time accuracy was adopted to carry out time advancement. For three-dimension turbulent channel flows of a polymer solution, based on the FENE-P model, the obtained efficiency of drag reduction for the four cases show that there exists the "onset" phenomena. Based on the O-B model, the simulations show that in low drag reduction, the effect of polymer on turbulence mainly occurs in the near wall region, and in high drag reduction, the effect of polymer on turbulence occurs in the whole flowfield.

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