Stratified shallow flow modelling

Environmental hydraulics covers a very wide range of applications including free surface flows in rivers. estuaries and lakes. To find engineering solutions to environmental hydraulics problems. 3D numerical modelling is nowadays widely used. However. the computation of sharp spatial gradients (such as found in stratified estuaries and lakes. around plumes near outfalls along rivers and coasts or in exchange areas of high shear). and the modelling of these processes along steep bathymetric slopes (such as found at the edge of dredged channels or of the continental shelf) remains a challenge. In addition. crude assumptions (such as the hydrostatic assumption) are often made to the primary differential equations in order to simplify the problem and enable long term prediction of environmental hydraulic changes. In this thesis. a robust adaptive mesh displacement (AMD) method is implemented and validated against the lock exchange case in particular. The AMD method aims at vertically focusing nodes within each water column to capture sharp gradients. while reducing the number of nodes or requiring prior knowledge of the flow structure. Second. a direct computation of dynamic pressure is introduced based on the equation of vertical momentum and validated against the analytical potential flow theory solution of a source-sink pair. Dynamic pressure is necessary to model destratification recirculation devices. or flow over dredge channel. or solitary waves. for instance. This direct computation method makes the hydrostatic assumption redundant. Third. a new advection scheme is implemented. whose main advantage is simplicity averaging over Riemann problems without solving them. while excessive numerical viscosity is compensated for by using high-resolution MUSCL type reconstruction. Recommendations are made in this thesis to extend the advection scheme developed herein for tracer advection to the non-linear shallow water equations. to the diffusion terms and to turbulence closure laws within the same finite element framework

ARTEMIS developments at HR Wallingford

Water Qualit

The TELEMAC’s automated management and continuous integration and validation system

Water Qualit

Assessment of Scour Development at a Deep-Water Marine Jetty Using 3d Computational Fluid Dynamics

To assess the interaction of the tidal flow with a deep-water marine jetty, Computational Fluid Dynamics (CFD) was used to predict flow patterns for fast flood and ebb tide conditions both without and with the jetty in place. The modelled area covered three square kilometres of coastal bathymetry around the jetty head, with pile diameters of the order of one metre and water depths ranging from 3 m to 45 m. The predicted changes in velocity and bed shear stress distribution were used to explain the observed local bed level changes at this site over a period of three years

Testing TELEMAC-2D suitability for tsunami propagation from source to near shore

Water Qualit

The Earth by TELEMAC

Water Qualit

Ichthys LNG Project, Australia: hydrodynamic modelling to inform management activities during dredging

Water Qualit

HPC for sensitivity studies: simulations with TOMAWAC and TELEMAC-3D

Water Qualit

Simplified physically-based modelling of overtopping induced levee breaching with TELEMAC-2D

Hydrodynamic

Adaptive vertical layering in TELEMAC-3D

Water Qualit