Title: CFD-modelling of free surface flows in closed conduits

Authors: Katharina Teuber; Tabea Broecker; Arnau Bayón; Gunnar Nützmann; Reinhard Hinkelmann

Addresses: Chair of Water Resources Management and Modeling of Hydrosystems, Technische Universität Berlin, Gustav-Meyer-Allee 25, 13355 Berlin, Germany ' Chair of Water Resources Management and Modeling of Hydrosystems, Technische Universität Berlin, Gustav-Meyer-Allee 25, 13355 Berlin, Germany ' Research Institute of Water and Environmental Engineering (IIAMA), Universitat Politècnica de València, C. de Vera, s/n, 46022 - València, Spain ' Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Müggelseedamm 310, 12587 Berlin, Germany; Geography Department, Humboldt-University of Berlin, Unter den Linden 6, 10099 Berlin, Germany ' Chair of Water Resources Management and Modeling of Hydrosystems, Technische Universität Berlin, Gustav-Meyer-Allee 25, 13355 Berlin, Germany

Abstract: Computational fluid dynamics (CFD) is gaining an increasing importance in the field of hydraulic engineering. This publication presents different application examples of a two-phase approach as implemented in the open source software OpenFOAM. The chosen approach is based on the volume of fluid method focusing on the simulation of flow in closed conduits. Three examples are presented: single-phase flow over a ground sill and free surface flow over a hill as well as complex free surface flow in a sewer model. The first example compares the results of different RANS turbulence models with experimental results. The results of the second example are compared with an analytical solution. In the last example the behaviour of the free surface flow is compared with the results of a model test and existing simulations using a simplified, open channel geometry for the closed conduit. For the examples analysed, the two-phase approach provides stable and reliable results.

Keywords: computational fluid dynamics; CFD; three-dimensional models; turbulence simulation and modelling; volume of fluid.

DOI: 10.1504/PCFD.2019.103266

Progress in Computational Fluid Dynamics, An International Journal, 2019 Vol.19 No.6, pp.368 - 380

Received: 09 Jul 2018
Accepted: 12 Sep 2018
Published online: 23 Oct 2019 *

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