Towards a General Strategy to Model Riblet Effects
Towards a General Strategy to Model Riblet Effects
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DOI：
10.2514/1.j051343
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发表时间：
2012-08
期刊：
影响因子：
2.5
通讯作者：
B. Aupoix;G. Pailhas;R. Houdeville
中科院分区：
文献类型：
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作者：
B. Aupoix;G. Pailhas;R. Houdeville
对于一个现实的配置，解决在riblet水平的流动细节是超出了目前的计算机的能力。因此，在实际计算中，需要一个riblet模型来考虑riblet。提出了一种使湍流模型敏感化以考虑沟槽的一般策略。与粗糙表面上的流动模型类似，所提出的模型由两部分组成。首先，示出的速度分布的移位是由于沟槽的表面摩擦变化的代表。这种转变是仿照从实验数据为U和V形肋作为肋的几何形状和特征雷诺数的函数。其次，提出了修改两种流行的湍流模型来再现对数区域的这种偏移的方法，这是基于壁区域的模型结构，使用边界层代码对各种形状和流动条件进行模型验证，从而导致表面摩擦力减小以及增加。
For a realistic configuration, solving the flow details at the riblet level is beyond the capabilities of present computers. Therefore, a riblet model is needed to account for riblets in practical computations. A general strategy to sensitize turbulence models to account for riblets is proposed. Similar to models for flows over rough surfaces, the proposed model is made of two parts. First, the shift of the velocity profile is shown to be representative of the skin friction change due to riblets. This shift is modeled from experimental data for Uand V-shaped riblets as a function of the riblet geometry and characteristic Reynolds number. Second, ways to modify two popular turbulence models to reproduce this shift of the logarithmic region are proposed, which are based upon the model structure in the wall region.Model validation is performed using a boundary layer code for various shapes and flow conditions, leading to skin friction reduction as well as increase.