Windt, Christian and Davidson, Josh and Chandar, Dominic and Ringwood, John (2019) On the importance of advanced mesh motion methods for WEC experiments in CFD-based numerical wave tanks. In: Proceedings of the VIII International Conference on Computational Methods in Marine Engineering MARINE 2019. International Center for Numerical Methods in Engineering (CIMNE), pp. 145-156. ISBN 9788494919435

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Abstract

For the economical operation of wave energy converts (WECs), energy maximising control systems (EMCSs) are included in the device design, introducing large structural motions. During the numerical modelling of WECs in CFD-based numerical wave tanks (NWTs), the structural motions must be explicitly accommodated in the finite volume domain. Using well known mesh morphing methods, large amplitude WEC oscillations may deteriorate the quality of the spatial discretisation, and push the NWT beyond the limits of numerical stability. To overcome this issue, advanced mesh motion methods, such as overset grids, have been developed; however, these methods are rarely used in numerical WEC experiments. To this end, the present paper aims to highlight the importance of advanced mesh motion methods, when modelling WECs under controlled conditions. To furthermore prove the feasibility of the overset method, implemented in the OpenFOAM framework, simulations of an uncontrolled WEC are performed, and results are compared to simulations using the mesh morphing method. It is shown that the overset method has potential to improve CFD-based models of controlled WECs, but, at the expense of increased computational cost.

Item Type:	Book Section
Additional Information:	unding: This paper is based upon work supported by Science Foundation Ireland under Grant No. 13/IA/1886. Josh Davidson is supported by the Higher Education Excellence Program of the Ministry of Human Capacities in the frame of Water science & Disaster Prevention research area of Budapest University of Technology and Economics (BME FIKP-V´IZ). Dominic Chandar is supported by the Institute Of High Performance Computing, Singapore.
Keywords:	Mesh motion; Overset grids; Numerical wave tank; Control; OpenFOAM;
Academic Unit:	Faculty of Science and Engineering > Research Institutes > Centre for Ocean Energy Research Faculty of Science and Engineering > Electronic Engineering
Item ID:	14270
Depositing User:	Professor John Ringwood
Date Deposited:	29 Mar 2021 14:15
Publisher:	International Center for Numerical Methods in Engineering (CIMNE)
Refereed:	Yes
Funders:	Science Foundation Ireland (SFI), Higher Education Excellence Program of the Ministry of Human Capacities, Hungary, Institute Of High Performance Computing, Singapore
URI:	Publisher
Use Licence:	This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available here

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