Department of Fluid System Dynamics, Institute of Technology of Berlin, Straße des 17. Juni 135, 10623 Berlin, Germany E-mail:
Department of Civil and Environmental Engineering, Norwegian University of Science and Technology, Valgrinda 2000, 424, Valgrinda, S. P. Andersens veg 5, Trondheim, Norway.
Water Sci Technol. 2019 Dec;80(11):2141-2147. doi: 10.2166/wst.2020.030.
Numerical and experimental investigations were undertaken to study sediment transport under steady flow conditions and under flush waves in sewer pipes. Experiments were carried out with sand and gravel of different size distributions under smooth and rough bed conditions. Moreover, different hydraulic boundary conditions were investigated for flush waves. The numerical part of this study was carried out in the computational fluid dynamics (CFD) software ANSYS Fluent, which is two-way coupled to the Discrete Element Method (DEM) software EDEM. The main focus of this study is to determine if the CFD-DEM coupled method could reasonably predict the behaviour of sediments in sewers and thus be used for studying various features of sediment transport that are not easy to determine in laboratory experiments or in-situ measurements. Furthermore, it is important to replace the traditional empirical approaches developed for fluvial conditions with new methodologies, which are able to consider the high number of variables involved in sediment transport in sewers. The numerical model was validated with laboratory experiments and used to study details of sediment transport processes in sewers.
进行了数值和实验研究，以研究在稳定流条件下和污水管道中冲刷波作用下的泥沙输送。实验采用不同粒径分布的砂和砾石在光滑和粗糙床面条件下进行。此外，还研究了冲刷波的不同水力边界条件。本研究的数值部分在计算流体动力学（CFD）软件 ANSYS Fluent 中进行，该软件与离散元法（DEM）软件 EDEM 双向耦合。本研究的主要重点是确定 CFD-DEM 耦合方法是否可以合理地预测污水管道中泥沙的行为，从而用于研究在实验室实验或现场测量中不易确定的各种泥沙输送特征。此外，用能够考虑到污水管道中泥沙输送所涉及的大量变量的新方法替代为河流条件开发的传统经验方法非常重要。数值模型经过实验室实验验证，并用于研究污水管道中泥沙输送过程的细节。
