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首页> 外文期刊>Engineering Applications of Computational Fluid Mechanics >Effect of Spatial Resolution of Rough Surfaces on Numerically Computed Flow Fields with Application to Hydraulic Engineering
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Effect of Spatial Resolution of Rough Surfaces on Numerically Computed Flow Fields with Application to Hydraulic Engineering

机译：粗糙表面空间分辨率对数值计算流场的影响及其在水利工程中的应用

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AbstractIn numerical simulations of flow over rough surfaces, the roughness is often not resolved but represented by a numerical model. The validity of such an assumption is investigated in this paper by Reynolds-Averaged Navier-Stokes simulations of flow over a surface with a large roughness. The surface was created from a high-resolution laser scanning of a real rock blasted tunnel. By reducing the geometrical resolution of the roughness in two steps, the importance of an appropriate surface description could be examined. The flow fields obtained were compared to a set-up with a geometrical flat surface where the roughness was represented by a modified form of the Launder and Spalding wall-function. The flow field over the surface with the lowest resolution was substantially different from those of the two finer resolutions and rather close to the results from the set-up with the wall-function. The results also yield that the finer the resolution is the more vorticity is formed close to the rough surfac...
机译：摘要在粗糙表面流动的数值模拟中，粗糙度通常无法解析，但可以用数值模型表示。本文通过对具有较大粗糙度的表面上的流动进行雷诺平均Navier-Stokes模拟研究了这种假设的有效性。该表面是通过对真实喷砂隧道的高分辨率激光扫描创建的。通过分两步降低粗糙度的几何分辨率，可以检查适当的表面描述的重要性。将获得的流场与具有几何平面的设备进行比较，其中粗糙度由Launder和Spalding壁函数的修改形式表示。具有最低分辨率的表面上的流场与两个较精细分辨率的流场基本不同，并且非常接近使用壁函数进行设置的结果。结果还表明，分辨率越高，靠近粗糙表面的涡旋越多。

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