Viscous-Flow Calculations on an Axial Marine Current Turbine

Otto, William; Rijpkema, Douwe; Vaz, Guilherme

doi:10.1115/omae2012-83452

Cited by 6 publications

(3 citation statements)

References 12 publications

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“…Aside from mesh resolution, the significant differences between the methods are turbulence closure, whether the simulations are steady or unsteady, whether a Multiple Reference Frame (MRF) approach is followed, often with a single blade in a 120 • wedge domain (with one exception simulating the whole rotor, WR) to simulate the flow relative to the blade / rotor, or if the whole rotating rotor is simulated in a domain matching the tow-tank geometry (TTG), and then whether the free surface is represented as un-deforming or by using a Volume-of-Fluid (VOF) free surface capturing approach. blueOASIS-BR-RANS from industry consultancy blueOA-SIS uses a community-based, open-usage, viscous-flow CFD code ReFRESCO [32], that has been used in previous tidal turbine studies [33]. The solver is incompressible, and the SIMPLE algorithm and the 𝑘-𝜔 SST transitional model were used.…”

Section: Blade Resolved Methodsmentioning

confidence: 99%

Tidal Turbine Benchmarking Project: Stage I - Steady Flow Blind Predictions

Willden,

Chen,

Tucker Harvey

et al. 2023

Proc. EWTEC

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This paper presents the first blind prediction stage of the Tidal Turbine Benchmarking Project being conducted and funded by the UK's EPSRC and Supergen ORE Hub. In this first stage, only steady flow conditions, at low and elevated turbulence (3.1%) levels, were considered. Prior to the blind prediction stage, a large laboratory scale experiment was conducted in which a highly instrumented 1.6m diameter tidal rotor was towed through a large towing tank in well-defined flow conditions with and without an upstream turbulence grid. Details of the test campaign and rotor design were released as part of this community blind prediction exercise. Participants were invited to use a range of engineering modelling approaches to simulate the performance and loads of the turbine. 26 submissions were received from 12 groups from across academia and industry using solution techniques ranging from blade resolved computational fluid dynamics through actuator line, boundary integral element methods, vortex methods to engineering Blade Element Momentum methods. The comparisons between experiments and blind predictions were extremely positive helping to provide validation and uncertainty estimates for the models, but also validating the experimental tests themselves. The exercise demonstrated that the experimental turbine data provides a robust data set against which researchers and design engineers can test their models and implementations to ensure robustness in their processes, helping to reduce uncertainty and provide increased confidence in engineering processes. Furthermore, the data set provides the basis by which modellers can evaluate and refine approaches.

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Section: Blade Resolved Methodsmentioning

confidence: 99%

Tidal Turbine Benchmarking Project: Stage I - Steady Flow Blind Predictions

Willden,

Chen,

Tucker Harvey

et al. 2023

Proc. EWTEC

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show abstract

“…Subsequently, CFD validation efforts have therefore mostly concentrated on such situations. ( [13][14][15][16]). Very few studies [17] have studied flow directionality.…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamic impact and power production of tidal turbines in a storm surge barrier

et al. 2020

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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.

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“…By lack of suitable full scale measurements, several studies validate their CFD modelling approach to scale model test. However, [3] concludes that considerable scale effects can be expected, making validation on scale model tests not very attractive.…”

Section: Introductionmentioning

confidence: 99%

CFD Study on Free-Surface Influence on Tidal Turbines in Hydraulic Structures

Tralli

Bijlsma

Velde³

et al. 2015

Volume 2: CFD and VIV

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In order to estimate the impact on energy production and environment of tidal turbines placed in or near hydraulic structures like discharge sluices or storm surge barriers, a Computational Fluid Dynamics (CFD) study has been carried out on the relation between (head) loss induced by the turbines and their gross power production. CFD computations have been performed for Tocardo T2 turbines, using STAR-CCM+. Simulations of a single turbine in free flow conditions compare favorably with results of Blade Element Momentum (BEM) computations, in terms of torque and thrust. This BEM method model had been previously validated against both CFD data and field measurements. Then, a series of tests has been performed in a “virtual tow tank”, including the effect of the free surface and the blockage by side and bottom walls. These computations provide a base for a first estimate of the effect of turbines on the discharge capacity of a generic structure. This is considered to be the first step in a more general approach in which ultimately the effect of tidal turbines in the Eastern Scheldt Storm Surge Barrier will be assessed.

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Viscous-Flow Calculations on an Axial Marine Current Turbine

Cited by 6 publications

References 12 publications

Tidal Turbine Benchmarking Project: Stage I - Steady Flow Blind Predictions

Tidal Turbine Benchmarking Project: Stage I - Steady Flow Blind Predictions

Hydrodynamic impact and power production of tidal turbines in a storm surge barrier

CFD Study on Free-Surface Influence on Tidal Turbines in Hydraulic Structures

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