A CFD Study on Impact Wave Loadings Exerted Behind Overtopping Type WECs
- Mariano Buccino (University of Napoli "Federico II") | Mohammad Daliri (University of Napoli "Federico II") | Fabio Dentale (University of Salerno) | Angela Di Leo (University of Salerno)
- Document ID
- International Society of Offshore and Polar Engineers
- The 28th International Ocean and Polar Engineering Conference, 10-15 June, Sapporo, Japan
- Publication Date
- Document Type
- Conference Paper
- 2018. International Society of Offshore and Polar Engineers
- Wave Energy Converters, CFD simulation, Wave Impact, Wave Overtopping
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- 14 since 2007
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One of the most interesting characteristics of the Wave Energy Converters (WEC) based on the overtopping principle is their capability of being integrated into conventional harbor structures. However, in these cases particular attention must be drawn to the structural stability and the nature of loadings exerted on the device. This paper presents CFD experiments on a composite breakwater including an upright section and a sloping crown simulating a WEC. The hydrodynamic forces caused by the overtopping process onto the inner face of the structure are analyzed, with a particular focus on the impulsive events
Wave Energy Converters (WECs) based on the overtopping principle, also referred to as OverTopping Devices (OTDs), have been paid a remarkable attention in the last years. They function by leading waves to flow in one or more reservoirs via a sloping plate often called “focuser”; then wave energy is extracted using a turbine that works with low head differences (below 3m) and large flow rates. Several OTDs have been developed so far, such as the pioneering “TAPCHAN” (TAPered CHANnnel Wave Power Device; Falcao 2004) or the floating device “Wave Dragon” (Kofoed et al., 2006); more recently, Buccino et al.(2015a) studied a very low-head hydropower plant, in which waves overtop in a shoreline reservoir, so forming a “composite seawall system”.
One of the most interesting OTDs features is their capability of being incorporated into conventional maritime structures (such as harbor breakwater), so that wave energy is produced while protecting coastal areas; as an example of such kind of WEC, Vicinanza et al. (2012) discussed the case of the Seawave Slot-cone Generator (SSG), a trapezoidal multi-reservoir system, whereas Vicinanza et al. (2014) and Contestabile et al. (2016) analyzed the response of the Overtopping Breakwater for Energy Conversion (OBREC).
In these cases the structural response of the devices has to be analyzed with a particular attention, given the double purpose of the structure. To these goal, a deep knowledge of the wave induced loadings is needed (see also Castellino et al., 2018).
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