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Large-eddy simulation of turbulent natural-bed flow

机译：湍流天然床流动的大涡流模拟

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摘要

The turbulent flow in natural rough beds is a complex subject, still poorly understood despite the longstanding effort of several researchers. In the present work, a turbulent open-channel flow experiment, with a pebble bed at Reynolds and Froude numbers, respectively, Re = 4.65 x 10(4) and Fr = 0.186, has been simulated using the Large-Eddy Simulation (LES) technique, in which the wall-adapting local eddy viscosity subgrid scale closure model is used and in the presence of an air-water interface to take into account the effects of the interface deformation in the flow turbulence statistics under a low relative submergence condition. The simulations have been compared with a companion experiment, where the channel bottom is constituted by four pebble layers. For the simulations, the pebble-bed surface has been captured with a high-resolution three-dimensional laser scanner and used to morphologically characterize the numerical channel bottom. Results are presented in terms of turbulence statistics and turbulent laws, showing a good agreement with those obtained in the experiment. Since a good convergence between simulation and experimental results was obtained, the LES dataset was used to compute the Turbulent Kinetic Energy (TKE) dissipation rate across the water depth. The mesh resolution allows showing a detailed TKE dissipation rate distribution across the water depth. Moreover, the equilibrium between TKE production and dissipation was checked to verify the overlap layer existence under low relative submergence condition. Finally, a new procedure for vortex-visualization is implemented, based on the relationship between the vorticity and the TKE dissipation rate. Published under license by AIP Publishing.
机译：尽管几位研究人员的长期努力，但自然粗糙床中的湍流是一个复杂的主题，仍然很糟糕。在本作工作中，使用大涡模拟（LES），分别在Reynolds和Froude号码处，在Reynolds和Froude号码处，在Reynolds和Froude号码，分别在Re = 4.65×10（4）和FR = 0.186中进行湍流开放式流动实验。使用壁调节局部涡粘度亚底级闭合模型的技术，并且在空气界面存在下，考虑在低相对潜水条件下在流动湍流统计中的界面变形中的界面变形的影响。已经与伴侣实验进行了比较，其中通道底部由四个卵石层构成。对于模拟，鹅卵石床表面已经用高分辨率三维激光扫描仪捕获，并且用于形态学表征数值频道底部。结果是在湍流统计和湍流法方面提出的，显示与实验中获得的达成愉快的协议。由于获得了模拟和实验结果之间的良好收敛，因此LES数据集用于计算水深湍流动能（TKE）耗散速率。网格分辨率允许显示水深的详细TKE耗散速率分布。此外，检查了TKE生产和耗散之间的平衡，以验证低相对淹水条件下的重叠层。最后，基于涡度与TKE耗散率之间的关系实现了涡旋可视化的新程序。通过AIP发布在许可证下发布。

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  • 来源
    《Physics of fluids》 |2019年第8期|共11页
  • 作者

    Alfonsi G.; Ferraro D.; Lauria A.; Gaudio R.;

  • 作者单位

    Univ Calabria Dipartimento Ingn Civile I-87036 Arcavacata Di Rende CS Italy;

    Univ Calabria Dipartimento Ingn Civile I-87036 Arcavacata Di Rende CS Italy;

    Univ Calabria Dipartimento Ingn Civile I-87036 Arcavacata Di Rende CS Italy;

    Univ Calabria Dipartimento Ingn Civile I-87036 Arcavacata Di Rende CS Italy;

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  • 正文语种 eng
  • 中图分类 流体力学;
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