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Prediction of the three-dimensional flow field and bed shear stresses in a regulated river in mid-Norway

机译：挪威中部调节河三维流场和床剪应力的预测

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摘要

This study evaluates the use of two Computational Fluid Dynamics (CFD) techniques in calculating the three-dimensional flow and bed shear stress distribution in a regulated river reach near Trondheim, Norway. The two different CFD codes being used in this study are: one commercial FLOW-3D and an in-house program, SSllM, developed by the third author (NRBO). One of the primary differences between the programs is that FLOW-3D uses an orthogonal, structured grid, while SSllM uses a non-orthogonal unstructured grid. Flow-3D computes the location of the free water surface based on a volume of fluid method. In the current study, the water surface profile was computed using a 1D backwater computation with SSllM. Both programs use first- or second-order schemes for the convective term in the Navier-Stokes equations, and the study investigated both options for the two different models. The computed results were compared to ADCP measurements obtained from three cross sections of the river. The comparison showed a good agreement between calculated and measured velocities when using higher-order discretization schemes. Using a first-order upwind scheme, the results deteriorated somewhat due to false diffusion. The results of this current study could be beneficial for the estimation of fluvial erosion, which causes severe damages to riverine areas.
机译：这项研究评估了两种计算流体动力学（CFD）技术在计算挪威特隆赫姆附近受调节河段的三维流动和河床切应力分布中的作用。本研究中使用的两种不同的CFD代码是：一个商业FLOW-3D和由第三作者（NRBO）开发的内部程序SSllM。程序之间的主要区别之一是FLOW-3D使用正交的结构化网格，而SSllM使用非正交的非结构化网格。 Flow-3D基于流体量法计算自由水表面的位置。在当前的研究中，使用SSllM的一维回水计算来计算水面轮廓。这两个程序对Navier-Stokes方程中的对流项均使用一阶或二阶格式，并且该研究研究了两种不同模型的两种选择。将计算结果与从河流的三个断面获得的ADCP测量值进行比较。当使用高阶离散化方案时，比较表明在计算速度和测量速度之间有很好的一致性。使用一阶迎风方案，结果由于虚假扩散而有所恶化。这项当前研究的结果可能有助于估算河流侵蚀，而河流侵蚀会对河流地区造成严重破坏。

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  • 来源
    《Hydrology research》 |2010年第2期|p.145-152|共8页
  • 作者

    Nils Ruether; Jens Jacobsen; Nils Reidar B. Olsen; Geir Vatne;

  • 作者单位

    Department of Hydraulic and Environmental Engineering, Norwegian University of Science and Technology, N-7491 Trondheim, Norway;

    AconaCMG, PO Box 53, N-4001 Stavanger, Norway;

    Department of Hydraulic and Environmental Engineering, Norwegian University of Science and Technology, N-7491 Trondheim, Norway;

    Department of Geography, Norwegian University of Science and Technology, N-7491 Trondheim, Norway;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    CFD; gravel riverbed; local scour; regulated rivers; river bend; shear stress;

    机译：差价合约砾石河床当地冲刷;受管制的河流;河流弯曲处;剪应力;

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