Initiative aims to de-risk new wave and tidal prototypes, so they can perform ‘right first time’ when tested in real sea conditions
Two of the world’s leading ocean energy test centres have joined forces – for a groundbreaking project to recreate scaled versions of Scotland’s oceans in the laboratory.
The European Marine Energy Centre (EMEC) in Orkney and FloWave Ocean Energy Research Facility at the University of Edinburgh first began working together in 2012 to share their expertise in ocean and laboratory testing.
For more than a decade EMEC has been the world’s leading test centre for new wave and tidal machines. Completed in 2014, FloWave’s 25m circular test tank is the only facility in the world to combine both waves and tides. Now they have kicked off an ambitious programme to use real-life ocean data from EMEC to replicate Orkney’s seas in the FloWave tank.
“Testing full-scale ocean energy technologies at sea can be an expensive and risky business,” says FloWave CEO Stuart Brown. “The closer you can replicate real ocean conditions in the laboratory, the better you can refine your prototype and validate how it might perform – before testing part-scale or full-scale devices at sea.”
Brown explains: “To date, test tanks have only been able to generate waves or tidal flows – but as anyone who has been to Orkney will know, Scotland’s oceans are much more complex and usually combine both. At FloWave our unique facility gives us the ability to create both waves and tidal currents at the same time.
“This is similar to the way an airliner would be tested in a wind tunnel during development, and is a first for the ocean energy sector. Ocean technology developers now have a clear pathway from the computer to the laboratory to EMEC and, if required, back to FloWave again,” Brown concludes.
Go with the flow
Through the initiative, EMEC is providing a wealth of data to FloWave – gathered over years by Waverider buoys, radar and ADCPs (acoustic Doppler current profilers) – which FloWave is using to develop accurate models to replicate the complex sea states encountered in Orkney as closely as possible. This challenging work is being led by research engineer Sam Draycott, now in the third year of a four-year industrial doctorate in offshore renewable energy at FloWave.
The results will be incredibly valuable, according to EMEC MD, Neil Kermode: “Developing a marine energy technology is not a linear process. You may start in a test tank before you bring an idea to sea, and then once you find out what works and what doesn’t, you end up back in the laboratory.
“At EMEC we have spent a lot of time recording wave and tidal data and are focussed on measuring the things that are important to developers. Our interest is in monitoring the conditions at a site, so that developers can use that data to aid their design process, and we can then validate the performance and potential power production of their technology.”
Kermode also observes that, “EMEC is purpose-built for sea trials with ready made test facilities, but working offshore can be expensive. That’s why it makes perfect sense to utilise the unique capabilities of FloWave to develop representative EMEC conditions in the test tank. By sharing this data, we will help accelerate learning from lab to sea and back again, and enable the UK to stay at the very forefront of this industry as it continues to mature.”
In at the deep end
Lindsay Roberts, senior policy manager for industry body, Scottish Renewables, says: “Real-sea testing of marine energy devices allows developers to gain a unique understanding of the way their machines work, but not everyone is ready to jump straight in at the deep end. FloWave provides real-sea conditions in the centre of Edinburgh, in all weathers and through all 12 months of the year, speeding up opportunities for the eventual deployment of devices to the sea in places such as Orkney.
“Replicating EMEC’s sea conditions at FloWave will help developers ensure their devices are ready for Orkney’s powerful waves and tides, and provide a cost-effective route to the later stages of real-world testing and eventual commercialisation.”
EMEC and FloWave are already the most advanced test facilities of their kind in the word. Through this collaboration they are making each centre’s offering even more compelling – and together they ensure the UK remains the world’s foremost destination for ocean energy research, testing and demonstration.
Pics: Am putting through five in total but you won’t need all. Four are of the facility and the other is a map of the coast around Scotland. Just use whichever you think work best. I’ll write captions when we know what we’re using.