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PerAWaT - Code Development in TELEMAC2D and TELEMAC3D in order to allow for the implementation of Parametric Characterization of Arrays (WG3 WP3 D2)


Citation Andreewsky, M., Bozonnet, P. and Leonard, C. PerAWaT - Code Development in TELEMAC2D and TELEMAC3D in order to allow for the implementation of Parametric Characterization of Arrays (WG3 WP3 D2), ETI, 2013. https://doi.org/10.5286/UKERC.EDC.000746.
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Author(s) Andreewsky, M., Bozonnet, P. and Leonard, C.
Project partner(s) Electricité de France SA (EDF SA)
Publisher ETI
DOI https://doi.org/10.5286/UKERC.EDC.000746
Download MRN_MA1003_34.pdf document type
Abstract The Performance Assessment of Wave and Tidal Array Systems (PerAWaT) project, launched in October 2009 with £8m of ETI investment. The project delivered validated, commercial software tools capable of significantly reducing the levels of uncertainty associated with predicting the energy yield of major wave and tidal stream energy arrays. It also produced information that will help reduce commercial risk of future large scale wave and tidal array developments.

This study aims to build methodologies to simulate the wake of several turbines in a large basin using the Telemac2D and Telemac3D softwares, developed by EDF

In order to have confidence in the simulations of tidal turbines in a large basin with Telemac2D, these steps were followed:
  • First, we verify that the FORTRAN subroutine (DRAGFO) used to simulate a tidal turbine in Telemac2D produces the same results when launched with one processor as it does with several processors.
  • Next, a simple flow than the wake downstream a tidal turbine is analyzed: this simple case is the wake of a flow around a cylinder, which is simulated for two models of turbulence in Telemac2D (k-epsilon model and constant viscosity model). The validated results from this analysis (mesh size, turbulence model ...) were used to get some guidance in our study which concerns the flow around the tidal turbines and not around cylinders.
  •  Third, the wake of a tidal turbine in a flume is simulated and validated in Telemac2D using laboratory measurements made by the LNHE department of EDF. The methodology for simulating one tidal turbine is defined, in particular a drag force is applied on a rectangular box in order to simulate the drag force due to the turbine.
  • Once it was established that a single tidal turbine in a flume could be modeled, two varying alignments of tidal turbine arrays were simulated in Telemac2D using the same two models of turbulence.At this stage, two methodologies are defined:
    • the first one for the method where a rectangular box is used for each turbine, and
    • the second methodology for the global box containing allturbines method. In this second case, the methodology also explains how to calculate an equivalent drag coefficient to simulate a set of turbines in a large scale basin.
  • In both methodologies, the way of choosing the mesh size (near and far from the rectangular box(es) and in the transition area ranging from a fine mesh to a larger mesh), the turbulence model, the drag coefficient, and the limitations are given.
With these methodologies, we have the ability to accurately simulate several turbineson a large basin with Telemac2D.

The same approach can be done in three dimensions and the following steps were followed with Telemac3d to develop the methodology:
  • First, it is verified that the subroutine (SOURCE) used to simulate a tidal turbine in Telemac3D produces the same results when launched with one processor as it does with several processors.
  • Second, a tidal turbine in a flume is simulated with Telemac3D.
The simulations are compared to the EDF LNHE measurements to adjust the parameters in order to obtain realistic simulations.

Then, numerical analysis shows that the Telemac2D approach is transferable to Telemac3D. This lays the groundwork for defining the methodology to be used to simulate multiple turbines in a large maritime area with Telemac3D (particularly, the methodology for calculating a drag coefficient equivalent to a set of turbines for large-scale basin applications).

This methodology defines also the choice of the mesh size (near and far from the horizontal cylinder(s)), the turbulence model, the drag coefficient, and the limitations.

Finally, methodologies which enable the simulation of a tidal array in a coastal basin scale model have been set up for both 2D and 3D. It is built on the step-by-step process which had been used for the validation task, which increases confidence in the ability of the developed routines to assess large scale effects of tidal energy extraction at basin scale. It consists in running simulations at a local scale with individual devices, in extracting the equivalent array drag coefficient from these, and in inserting that piece of information in the large basin scale model.

Telemac2D and Telemac3D are now capable of assessing the impact ofany array layouts on large scale hydrodynamics effects, as the software user has the opportunity of combining the use of the DRAGFO and SOURCE routines with an appropriate methodology.
Associated Project(s) ETI-MA1003: Performance Assessment of Wave and Tidal Array Systems (PerAWaT)
Associated Dataset(s) EDC0000134: Tidal Energy Site Environmental Conditions Measured During the ReDAPT Tidal Project 2011-2014
Associated Publication(s)

ETI Insights Report - Wave Energy

PerAWaT - An Investigation into the effect of Ambient Turbulence Levels on the Wakes of a Conventional Low-Solidity and an Open-Centre High-Solidity Tidal Current Turbine (WG3 WP5 D4)

PerAWaT - A Parameterization of the end-of-Near-Wake Region for a Conventional Low Solidity and an Open-Centre High-Solidity Tidal Current Turbine (WG3 WP5 D3)

PerAWaT - Array Scale Experimental Test Report (WG4 WP2 D5)

PerAWaT - Array Scale Experiment Specification (WG4 WP2 D1)

PerAWaT - Calibration Report for Scale Model Experiments (WG4 WP2 D4)

PerAWaT - Choice of Numerical Model (WG3 WP6 D1)

PerAWaT - Comparison with EDF (WG3 WP6 D6)

PerAWaT - Consent Licence for Installation of 1:10th Scale Tidal Turbines in Strangford Lough, Northern Ireland (WG4 WP5 D1)

PerAWaT - Design and Characterisation of Array Emulators (WG4 WP4 D2)

PerAWaT - Design and Specification of Ducted Disc Experiments (WG4 WP3 D1)

PerAWaT - Design and Testing Specification (WG4 WP4 D1)

PerAWaT - Design of Equipment for Scale Model Experiments (WG4 WP2 D2)

PerAWaT - Development of a Computational Fluid Dynamics Mesoscale Tidal Channel Model

PerAWaT - Development of a Computational Fluid Dynamics Model for a Horizontal Axis Tidal Current Turbine WG3 WP5 D1)

PerAWaT - Development of a Computational Fluid Dynamics Model for an Open-Centre Tidal Current Turbine (WG3 WP5 D2)

PerAWaT - Development of Free Surface Wave Model for an Axial Flow Tidal Turbine

PerAWaT - DIA Methodology Report

PerAWaT - Experimental and Computation Investigations into Ducted Porous Discs and Rotors at Low Blockage (WG4 WP3 D3)

PerAWaT - Experiment Data, Quality Controlled and Delivered (WG4 WP3 D2)

PerAWaT - Final Summary Report

PerAWaT - GH Blockage Modelling Report (WG3 WP4 D1)

PerAWaT - GH Device Scale Modelling Report

PerAWaT - GH Far Wake Modelling Report (WG3 WP4 D5)

PerAWaT - GH Inter-Array Scale Modelling Report (WG3 WP4 D6)

PerAWaT - GH Near Wake Modelling Report (WG3 WP4 D2)

PerAWaT - Identification of Test Requirements and Physical Model Design (WG4 WP1 D1)

PerAWaT - Implementation of Wave Energy Converters in Spectral Wave Models (WG1 WP2 D2)

PerAWaT - Implementation Report: Frequency-Domain Model (WG1 WP1 D2)

PerAWaT - Implementation Report: Time-Domain Model (WG1 WP1 D3)

PerAWaT - Influence of Free Surface Waves on the Performance and Wake Structure of a Ducted Horizontal Axis Tidal Turbine (WG3 WP1 D7)

PerAWaT - Influence of Free Surface Waves on the Performance and Wake Structure of a Horizontal Axis Tidal Turbine

PerAWaT - Large Array Testing

PerAWaT - Methodology and site case analysis for the SpecWEC modelling tool

PerAWaT - Methodology Report (WG1 WP1 D1B)

PerAWaT - Non-Linear Model Description Report (WG1 WP1 D7)

PerAWaT - Numerical Modelling of Tidal Turbine Arrays Involving Interactions within an Array: Development of the Level-Set Free Surface Model

PerAWaT - Numerical Modelling of Tidal Turbine Arrays Involving Interactions within an Array: Implementation of the Zero Tangential Shear Condition

PerAWaT - Performance and Wake Structure of a Full-Scale Horizontal Axis Axial Flow Turbine

PerAWaT - Performance and Wake Structure of a Model Horizontal Axis Axial Flow Turbine

PerAWaT - Rationalised Flow Field Modelling Report (WG3 WP4 D4)

PerAWaT - Regional Scale Plug-In Protocol (WG3 WP4 D10)

PerAWaT - Report of Calibrated Numerical Models of Anglesey and the Bristol Channel, including Validation Against Measured Data (WG3 WP6 D4B)

PerAWaT- Report of Calibrated Numerical Models of Pentland Firth, including Validation Against Measured Data (WG3 WP6 D4A )

PerAWaT - Report on Assessment of the Impact of Energy Extraction for the Horizontal Axis Tidal Turbine on Large Scale Tidal Characteristics at Example UK Sites (WG3 WP6 D8)

PerAWaT - Report on Characterisation and Assessment of the Availability of Resource at Example UK Sites (WG3 WP6 D7)

PerAWaT - Report on Comparisons of Nonlinear Models with Experimental Data for both Single Devices and Arrays of Devices (WG1 WP1 D1)

PerAWaT - Report on Model Setup for Ducted Horizontal-Axis Axial Flow Turbines

PerAWaT - Report on Model Setup for Horizontal Axis Axial Flow Turbines (WG3 WP1 D1)

PerAWaT - Report on Nonlinear Analysis of a Single Controlled Device in Irregular Seas (WG1 WP1 D11), AND Report on Nonlinear Analysis of Controlled Arrays in Irregular Seas (WG1 WP1 D12)

PerAWaT - Report on Non-Linear Analysis of Single and Arrays of Free Floating Devices (WG1 WP1 D9)

PerAWaT - Report on Responses and Power Take-Off from Controlled Devices in Regular Waves (WG1 WP1 D10)

PerAWaT - Report on the Inclusion of FDC Tidal Arrays into DG-ADCIRC Model (WG3 WP6 D5)

PerAWaT - Representation of Wave Energy Converters in Spectral Wave Models (WG1 WP2 D1)

PerAWaT - Scientific Report for the SpecWEC Modelling Tool - Part 1

PerAWaT - Selection of Appropriate Example Sites and Acquisition of Necessary Data to define Site Characteristics (WG3 WP6 D3)

PerAWaT - SpecWec Beta Version Release

PerAWaT - Test Schedule and Test System Design of 1:10th Scale Tidal Turbines in Strangford Lough, Northern Ireland (WG4 WP5 D2)

PerAWaT - Tidal Array Scale Numerical Modelling Interactions within a Farm (Steady Flow) WG3 WP2 D5a

PerAWaT - Tidal Array Scale Numerical Modelling: Interactions within a Farm (Unsteady Flow) WG3 WP2 D5b

PerAWaT - Tidal Array Scale Numerical Modelling: Level Set Technique Implementation within Code Saturne, Validation of the Combined Implementation (Flow Solver)

PerAWaT - Tidal Basin Modelling: the Alderney Race, the Pentland Firth and the Paimpol-Bréhat Sites Modelled in Telemac Software WG3 WP3 D1

PerAWaT- Tidal Coastal Basin Numerical Modelling: Large Scale Effects of Tidal Energy Extraction (WG3 WP3 D4)

PerAWaT - Tidalfarmer Interim Model Validation Report (WG3 WP4 D18)

PerAWaT - Tidalfarmer Model Validation And Uncertainties (WG3 WP4 D19)

PerAWaT - Tidal Farm Modelling: the Alderney Race, the Pentland Firth and the Paimpol-Bréhat Sites Modelled in Telemac Software (WG3 WP3 D3)

PerAWaT - User Report for the SpecWEC Modelling Tool - Part 2

PerAWaT - Validation and Verification of the SpecWEC Numerical Modeling Tool

PerAWaT - Verification of Code (WG3 WP6 D2)

PerAWaT - Weakly-Nonlinear Hydrodynamics of Freely Floating WECS (WG1 WP1 D8)