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Modelling of hydraulic structures
Published in P. Novak, V. Guinot, A. Jeffrey, D.E. Reeve, Hydraulic Modelling – an Introduction, 2010
P. Novak, V. Guinot, A. Jeffrey, D.E. Reeve
For a general introduction to the subject, see, for example, Verwey (1983), which includes a case study of the Oosterschelde storm-surge barrage in the Netherlands. For a comprehensive treatment of the modelling of free-surface flows (including application to gated spillways), see, for example, Bhrgisser (1999), which contains a large list of references, and Schindler (2001), which includes an application to flow over a raised bed sill. Hervouet (2007) provides a detailed guide for the modelling of free-surface flows using the finite-element method (using, for example, Telemac, developed by Electricité de France).
Numerical simulation of dune movements during a flood event in River Elbe, Germany
Published in Wim Uijttewaal, Mário J. Franca, Daniel Valero, Victor Chavarrias, Clàudia Ylla Arbós, Ralph Schielen, Alessandra Crosato, River Flow 2020, 2020
The three-dimensional simulations have been done with the open-source software TELEMAC-MASCARET (opentelemac.org). With Telemac-3D the Reynolds-Averaged Navier-Stokes equations are solved with a finite-element solver. The morphodynamic (bed load) is simulated with the module called Sisyphe which is coupled to Telemac-3D. Further details can be found in e.g. Hervouet (2007), Villaret et al. (2013).
Sensitivity of aquatic habitat modeling to hydrodynamic calibration
Published in Journal of Ecohydraulics, 2022
Ludovic Cassan, Hélène Roux, Dominique Courret, Sylvain Richard
To solve the Saint Venant equation, we performed simulations by 1 D and 2 D methods with the geometry described above. For the 1D calculation, the HEC-RAS software is used in steady state. The bed friction can be described either by a constant Manning coefficient n, or by k which represents a size of roughness in the so-called” Nikuradse” model. To obtain a transverse velocity distribution, the cross-section is divided into 19 intervals corresponding to a length of about 1-2 m (station 1) and 3 m (station 2). Details of the method can be found in the HEC-RAS reference manual (Hydrologic Engineering Center 2016). The 2D calculations are performed with the TELEMAC 2 D software based on the finite element method (Figure 2) (Hervouet 2007). A turbulence model ( model) is used to better describe the velocity field near the emerging blocks (Tran et al. 2016). The time step is 0.1 second and the mesh size varies between 0.2 and 3 m. It is refined near large blocks. The simulation lasts 3000 seconds and for each calculation it is verified that the steady-state solution is obtained. For both types of modelling, the boundary conditions are identical: a downstream rating curve and a constant flow upstream. The rating curves are obtained from the water depth measurements used for calibration (see following section).
An adoption of the Spalart–Allmaras turbulence model for two- and three-dimensional free surface environmental flows
Published in Journal of Hydraulic Research, 2021
Adrien Bourgoin, Kamal El Kadi Abderrezzak, Sofiane Benhamadouche, Riadh Ata
The adapted turbulence model was implemented in the open-source Telemac-Mascaret software system (www.opentelemac.org). Telemac-Mascaret is a CFD code developed by EDF R&D (Hervouet, 2007) based on a finite element/finite volume method and solves the incompressible 3D Navier–Stokes equations with its Telemac-3D component and the shallow water equations with Telemac-2D (Hervouet, 2007). It is mainly used to simulate environmental flows since it is able to model free surface flows and many natural phenomena, such as rain, wind, waves, heat exchange with the atmosphere and sediment transport. In terms of turbulence modelling, a RANS approach was used in both Telemac-3D and Telemac-2D. The present turbulence model originally designed for 3D aero-elastic applications was adapted for hydraulic flows with both Navier–Stokes and shallow water equations.
Evaluation of the PG method for modeling unsteady flows in complex bathymetries
Published in Journal of Applied Water Engineering and Research, 2018
Arturo S. Leon, Christopher Gifford-Miears
The open source TELEMAC-2D solves the 2D shallow water equations using the finite-element or finite-volume method and a computation mesh of triangular elements (Galland et al. 1991; Hervouet 2007). In the present work we have used the finite volume method. Various turbulence closure schemes are implemented in TELEMAC-2D. The extended turbulence model is used in this paper to represent turbulence production and dissipation (Hervouet 2007). Standard applications of the TELEMAC-2D model include dam break and flood inundation studies.