A LES Modification for Turbulent Flows of Surfactant Solutions
A LES Modification for Turbulent Flows of Surfactant Solutions
复制标题
表面活性剂溶液湍流的 LES 修正
DOI：
10.1299/jfst.8.54
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发表时间：
2013
影响因子：
0.8
通讯作者：
Y. Usui
中科院分区：
文献类型：
--
作者：
T. Ohta;Y. Usui
我们对表面活性剂溶液的湍流槽道流进行了直接数值模拟（DNSs），目的是基于从包括减阻效应的DNSs中获得的知识开发改进的艾德大涡模拟（LES）方法。我们的结果表明，通过对空间尺度进行可变粘度相关的归一化，湍流统计的轮廓和峰值位置近似于牛顿流体的轮廓和峰值位置。这意味着，通过这种归一化，我们可以研究湍流结构的普遍特征。此外，我们进行了湍流通道湍流的LES，并确认所提出的方法的可行性。我们得到的速度分布和壁面摩擦系数与DNS结果有很好的相关性。因此，我们现在能够预测壁湍流调制的表面活性剂溶液与LES方法通过估计的空间尺度的湍流的湍流滤波与粘度相关的校正函数。
We performed direct numerical simulations (DNSs) of turbulent channel flow for surfactant solutions with the purpose in developing a modified large eddy simulation (LES) method based on the knowledge obtained from such DNSs that include drag reduction e ff ects. Our results indicate that, by a variable viscosity-dependent normalization of the spatial scale, the profiles and the peak positions of the turbulence statistics approximate those of a Newtonian fluid. The implication is that by such normalizations we can investigate universal characteristics of the turbulent structures. Further, we performed LESs of turbulent channel flow and confirmed the viability of the proposed method. We obtained velocity profiles and the wall friction coe ffi cient that correlate well with DNS results. Consequently, we are now able to predict the wall turbulence modulation for surfactant solutions with the LES method by estimating the spatial scale of the turbulent flow filtered with a viscosity-dependent correction function.