Abstract
To estimate the impact on energy production and environment of tidal turbines placed in the Eastern Scheldt Storm Surge Barrier a Computational Fluid Dynamics (CFD) study has been carried out on the additional head differences induced by the turbines. The CFD model focusses on a single gate opening of the Storm Surge Barrier and includes half of the adjoining gates on either side. In this 40 m wide Gate a 1.2 MW array existing of five Tocardo T2 tidal turbines has been installed as part of a demonstration project in 2015. Transient computations of the barrier with and without the turbine array were carried out for a range of quasi stationary tidal phases. The turbines are resolved in detail as rotating equipment: real-time rotation of the turbine blades (involving the displacement of the mesh nodes in an unsteady setting) is implemented, and torque and thrust for the prescribed speed of rotation is provided as output. The results for velocity, power and thrust are compared with field experiments to validate the model. Based on these computations an estimate of the effect of turbines on the discharge capacity of the storm surge barrier is given. This information will be used to parameterize the tidal turbines in the far-field hydrodynamic model of Eastern Scheldt estuary for the ultimate assessment of the effect of tidal turbines on energy production and on the environment.
Highlights
T HE Eastern Scheldt Storm Surge Barrier consists of 62 individual gates, and is constructed of concrete pillars, top beams and sill beams connecting to a rockfill sill construction and about 600 m of bed protection on both sides, see [1]
The aim of the current paper is to combine the modelling of bathymetry, surrounding structures and rotating blades to simulate a field scale tidal turbine array with high blockage owing to its location in a Storm Surge Barrier
The discharge coefficient gives the relation between the head and the discharge for a given situation. It is dependent on the cross section: in case of the Eastern Scheldt barrier this is dependent on the water level
Summary
T HE Eastern Scheldt Storm Surge Barrier consists of 62 individual gates, and is constructed of concrete pillars, top beams and sill beams connecting to a rockfill sill construction and about 600 m of bed protection on both sides, see [1]. In 2015 an array of five tidal turbines was deployed in Gate #08 of the Roompot Section of the barrier in the SMubanmuisscsriiopnt 1re4c2e8iv.eTdid1a6l hMydarrcohd;ynacacmepitcedmo3d0 eMllinargc.h;Thpeubwliosrhkedis 3p0art Nofovtheme bDeur,t2c0h20M. Very few studies [17] have studied flow directionality. Higher blockages have been studied for cross flow turbines [21]. Turbines located in a Storm Surge Barrier will have a higher blockage than those available in this literature
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