Review of Tidal Turbine Wake Modelling Methods State of the Art th - - PowerPoint PPT Presentation

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Sep 19, 2023 156 likes •312 views

Review of Tidal Turbine Wake Modelling Methods State of the Art th Europea 13 th 13 ean Wave and Tid idal l Ener ergy Con Conference EWTEC 2019 Ellen Jump 1 , Alasdair Macleod 1 , Tom Wills 2 1. Offshore Renewable Energy Catapult 2.

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This project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 745862.

Review of Tidal Turbine Wake Modelling Methods – State of the Art

13 13th

th Europea

ean Wave and Tid idal l Ener ergy Con Conference – EWTEC 2019 Ellen Jump1, Alasdair Macleod1, Tom Wills2

1. Offshore Renewable Energy Catapult 2. Nova Innovation

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Commercial in Confidence

CONTENT

EnFait project introduction
Aims of the review
Wake phenomena
Wake influences
Physical modelling
Numerical modelling
Array interaction modelling
AIM in the EnFait project

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Commercial in Confidence

The EnFAIT Project

€20m, 5-year Horizon 2020 project
World’s first offshore tidal array (Shetland)
Deploy 3 additional Nova M100 turbines
Reduce the cost of tidal energy

A huge step towards a commercial, bankable tidal energy sector

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Commercial in Confidence

Tidal stream, horizontal axis tidal turbines (HATT)
Wake phenomena, wake interaction
Array interaction modelling (AIM) method
In

Inform tida tidal l arr array la layout

Review Scope & Aims

Initial T4-6 location Final T4-6 location Existing T1-3 location

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Commercial in Confidence

Wake Phenomena

velocity recovery near wake far wake (10-20D) meandering asymmetry velocity deficit within wake tip vortices swirl shear layer inner wake accelerated flow around wake mid wake

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Commercial in Confidence

Wake Influencing Factors

shear profile waves bathymetry tower shadow, device generated turbulence tidal speed and direction water depth, hub height turbulence

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Commercial in Confidence

Turbine Representations in Models

Velocity Deficit Swirl Tip Vortices Actuator Disk

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x x Blade Element Method

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x with additions Actuator Line

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with additions Fully-Resolved

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Commercial in Confidence

Physical Modelling of Wakes

Figures – scale turbine testing as part of the MONITOR project

Lab testing
Reduced cost and risk
Wake behaviour, influences
Scaling challenges – near wake
Blockage influences
Measurement methods
At-sea testing
True representation
Multiple interacting influences
Commercial sensitivity

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Commercial in Confidence

EnFAIT Wake Modelling – Initial Prediction from ADCP Data

Wake characteristics
Turbulence
Direction
Behaviour in flow
Current and wave interactions

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Commercial in Confidence

BEMT
CFD methods – many variations
RANS
Smooths turbulent eddies
Turbulence model dependent on application
LES
If local flow/blade generated detail needed
RANS / Synthetic Eddy (SEM) inlet conditions
Hybrid Methods
Reduce complexity
Small scale turbulence at wall regions
DES
Improved Scale-Adaptive Simulation (ISAS)

Numerical Modelling of Wakes

Initial EnFait CFD Simulation,

P. Ouro

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Commercial in Confidence

Array Interaction Modelling

Ouro et al. Analysis of array spacing on tidal stream turbine farm performance using Large-Eddy

Simulation. Under review in J Fluids Structures

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Commercial in Confidence

Array Interaction Modelling in EnFait

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Commercial in Confidence

EnFAIT – demonstrate the world’s first tidal array, and

reduce tidal LCOE

Wake phenomena and influencing factors
Physical modelling of wakes
Numerical modelling of wakes
Array interaction modelling
Which phenomena need to be represented?
Array modelling approach for EnFAIT
Practical, robust, industry appropriate approach

Summary

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CONTACT US

www.enfait.eu Email: info@enfait.eu Tel: +44 (0)131 241 2000

This project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 745862.