Assessing focused wave impacts on floating wave energy converters using OpenFOAM
This study considers focused wave interactions with floating wave energy converters and represents an individual contribution to the CCP-WSI blind test series 2, in which the submitted results are compared against both physical and alternative numerical solutions for varying wave steepness achieved through changes in peak frequency. Reducing the time taken to provide reliable results is critical if computational fluid dynamics (CFD) is to become a routine design tool for offshore renewable energy devices. This can potentially be achieved by simplifying simulation set-up, and hence reduce the required man-hours, through standardised ‘best practice’ procedures. In order to achieve this, it is essential that the limitations of a numerical tool are well understood, and minimised. Therefore, this study aims to quantify the numerical reproduction of the focused wave event, and the motion of two different geometries predicted using a commonly used CFD methodology with waves generation achieved by way of linear superposition. The results imply that the error in peak values of heave and empty tank surface elevation are comparable, but the peak surge and pitch are substantially larger. This is likely due to a combination of numerical modelling errors, which must be addressed in future study.
- Authors: Edward J. Ransley, Scott A. Brown, Martyn Hann, Deborah M. Greaves, Christian Windt, John Ringwood, Josh Davidson, Pal Schmitt, Shiqiang Yan, Junxian X. Wang, Jinghua H. Wang, Qingwei Ma, Zhihua Xie, Giuseppe Giorgi, Jack Hughes, Alison Williams, Ian Masters, Zaibin Lin, Hao Chen, Ling Qian, Zhihua Ma, Qiang Chen, Haoyu Ding, Jun Zang, Jennifer van Rij, Yi-Hsiang Yu, Zhaobin Li, Benjamin Bouscasse, Guillaume Ducrozet, Harry BinghamSource: Proceedings of the Institution of Civil Engineers - Engineering and Computational Mechanics, Volume 174, Issue 1, 1 Mar 2021 (46–61)