The heart of FloWave is a 30m circular concrete basin containing the 25m diameter, 5m deep wave and current tank.
Containing more than 2.4 million litres of water the test tank is divided into upper and lower volumes, separated by a 1m thick moveable floor. The 2m deep upper test volume is circumferentially ringed by 168 absorbing wave makers, whilst the lower volume contains the twenty-eight flow-drive units that can simultaneously and independently drive current across the upper test volume in any relative direction, with maximum current velocities of 1.6 metres per second.
The rising tank floor and 5t overhead crane enable quick and easy installation of individual devices, or arrays of wave or tidal current generators, and the typically 3 minute settle time between tests combine to enable very efficient, effective and data-intensive test campaigns.
FloWave may be more expensive than many other facilities, but the intensity of testing achievable is far greater than the majority of other facilities where reflections and repetitive model setup requirements mean the ‘data-per-day’ rates are a fraction of that achievable at FloWave.
Circular Tank Benefits
Because the tank is circular and therefore non-directional, waves and currents in the tank can act in any combination and in any relative direction across the upper volume 25m metres in diameter and 2m deep.
Optimised for 700mm, two second waves, the 168 absorbing wave-makers paddles can create full-spectrum multi-directional waves as well as more traditional monochromatic waves, and all this over a roughly circular test area of more than 200 square metres. Depending on the scale chosen this corresponds to full-scale seas of up to 28m waves, currents in excess of 12 knots, and a sea-area of approximately 2 square kilometres.
360 degree symmetry of wave and current conditions
Because the tank is circular and therefore non-directional, waves and currents in the tank can act in any combination and in any relative direction across the large central volume.
1/20th scale model testing conditions
Bridging the gap between 1/100th ‘flume scale’ test modelling and testing prototypes at 1/6th scale and above in the real sea, testing at 1/20th scale at FloWave introduces a critical evaluation stage-gate into the device development cycle at the “go/No-go” decision point for investors and funders. This helps to bridge the so-called ‘valley of death’ between small-scale test equipment and full scale prototypes.
Unrivalled control and repeatability
Test conditions for current and waves in all directions can be simply programmed and run, or chosen from a suite of standard ocean spectra correlating to actual measured sea-states. Complex wave and current conditions for normal, challenging and extreme conditions can easily be simulated and repeated time after time, thereby allowing devices and control algorithms to be be iteratively adjusted to find optimal performance settings and reducing the time taken to get to the optimised ‘right first time’ design.
Perfect for array project testing
Building on the techniques developed for the 100th scale curved wave tank at the University of Edinburgh over the last twelve years, FloWave’s 220 square metre test area is large enough to accommodate small arrays of devices, and will be of particular interest to Project developers looking to physically validate computational layout models.