Abstract
The fluid dynamics around and inside an OWC-type wave energy device is studied using Direct Numerical Simulations of the multiphase air-water two-dimensional vertical Navier-Stokes equations. A schematic rectangular shaped OWC device placed against the vertical ending wall of the numerical rectilinear wave flume is considered. Owing to numerical constraints, reduced scale simulations are carried out with a focus on the near field of the device over a couple of wavelengths. The power take-off system is simply modelled by an opening through the roof of the device. A parametric study on incident wave period is performed to determine the fluid-structure interactions. Beyond the efficiency predictions, which agree fairly well with different values found in the literature, specific behaviours related with an enhancement of free-surface non-linearities around the resonance frequency are observed. Water flow vorticity is found mainly produced in the vicinity of the end of the semi-immersed frontal wall of the device. Significant energy dissipation results from shear-layer and vorticity associated with the air flow passing through the turbine opening. A one-dimensional vertical analytical model is used to compute the instantaneous bottom shear stress and the induced-bedload sediment transport rate which appears impacted by OWC device.
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Acknowledgements
The authors acknowledge Annaïg Pedrono and Thomas Bonometti for their help with JADIM use and programming. This work was granted access to the HPC resources of CALMIP supercomputing center under the allocation 2014-[p1438].
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Rameliarison, V., Astruc, D., Chapalain, G. (2020). Navier-Stokes Modelling of Fluid Flow and Related Sediment Transport in the Near Field of an Oscillating Water Column Wave Energy Converter. In: Nguyen, K., Guillou, S., Gourbesville, P., Thiébot, J. (eds) Estuaries and Coastal Zones in Times of Global Change. Springer Water. Springer, Singapore. https://doi.org/10.1007/978-981-15-2081-5_11
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