Computational fluid dynamics (CFD) based numerical wave tanks (NWTs) can provide valuable insight into the hydrodynamic performance of wave energy converters (WECs). Being able to capture hydrodynamic non-linearities, CFD-based NWTs (CNWTs) allow the analysis of WECs over a wide range of test conditions, such as sea states, power take-off control settings and model scale. The capabilities of a CNWT are exploited in this paper, which aims at the analysis of the scaling effects of two moored, point-absorber type WECs, exposed to focused waves. To this end, three different scales are considered: 1:1, 1:10 and 1:10PWT. The latter, 1:10PWT scale, refers to the typical scale used in physical wave tanke (PWTs), complying with Froude similitude, but violating Reynolds similitude. In the 1:10 scale model, fluid viscosity is scaled, inline with the geometrical properties, thereby achieving both Froude and Reynolds similitude. From the results, average differences between the three considered scales of around 5% have been observed, and the overall biggest sensitivity to scale effects can be found in the surge and pitch degree of freedom.
|Title of host publication||The Proceedings of the 29th (2019) International Ocean and Polar Engineering Conference|
|Number of pages||8|
|Publication status||Published - Jun 2019|
- Wave Energy, CCP-WSI Blind Test, Impulse wave maker, CFD, numerical wave tank, OpenFOAM, Scaling