The linear response of turbulent flow to a volume force: comparison between eddy-viscosity model and DNS
The linear response of turbulent flow to a volume force: comparison between eddy-viscosity model and DNS
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湍流对体积力的线性响应：涡粘模型与 DNS 的比较
DOI：
10.1017/jfm.2016.4
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发表时间：
2016
影响因子：
3.7
通讯作者：
P. Luchini
中科院分区：
文献类型：
--
作者：
S. Russo;P. Luchini
我们确定了一个足够简单的基准问题，可以通过涡粘模型和直接数值模拟来解决：这是湍流的平均速度曲线对外部体积力的线性响应。 Luchini 和 Charru 在一项由底部地形引起的扰动的研究中发现了这种力的一个例子（J. Fluid Mech.，第 656 卷，2010 年，第 337-341 页）。另一方面，Quadrio & Luchini（第九届欧洲湍流会议论文集，英国南安普敦，2002 年，第 715-718 页）和 Luchini 等人对该方法进行了修改。 （Phys. Fluids，第 18 卷，2006 年，121702）计算壁面湍流的线性脉冲响应允许直接计算对体积力的响应。比较显示出显着差异，并表明设计提供正确结果的涡粘模型可能存在根本障碍。
We identify a benchmark problem simple enough that it can be solved both by an eddy-viscosity model and by direct numerical simulation: this is the linear response of a turbulent flow’s mean-velocity profile to an external volume force. An example of such a force was found in a study of the perturbation induced by bottom topography by Luchini & Charru (J. Fluid Mech., vol. 656, 2010, pp. 337–341). On the other hand, a modification of the method by Quadrio & Luchini (Proceedings of the IX European Turbulence Conference, Southampton, UK, 2002, pp. 715–718) and Luchini et al. (Phys. Fluids, vol. 18, 2006, 121702) to compute the linear impulse response of a wall-bounded turbulent flow allows the response to a volume force to be computed directly. The comparison exhibits significant differences and suggests that there might be fundamental obstacles to designing an eddy-viscosity model that provides the correct result.
金钱与时间：从能耗和便利性角度评估流量控制
影响因子：
3.7
作者：
Frohnapfel;Hasegawa;Quadrio
通讯作者：
Quadrio