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CFD modelling of breakwaters embedding wave energy converters
In recent years the raising supply and environmental problems related to traditional fossil fuel exploitation for energy production have pushed the research on renewable sources. Among these, sea waves have a high potential, but still poorly used. Different technologies have been developed in order to harness wave energy, and the Oscillating Water Column (OWC) devices are the most accredited for an actual diffusion. This work is focused on the performance analysis of particular OWC-type devices, namely the REWECs (REsonant sea Wave Energy Converter). Two different versions have been considered, the REWEC1 and the REWEC3, constituting a submerged and an emerged breakwater, respectively. The most interesting aspect of REWECs is the possibility to operate them under resonant conditions with that sea state which is the one that gives the highest yearly energy contribution. Both REWEC1 and REWEC3 dynamic behavior can be approximated by means of a mass-spring-damper system. According to this approximation, a criterion for evaluating the oscillating natural frequency of the REWECs has been derived. A CFD model has been developed in order to verify the resonance behaviour of a scaled REWEC1 device. The water-air interaction has been taken into account by means of the Volume Of Fluid (VOF) model implemented in the commercial code Ansys Fluent. Both air and water fow felds have been assumed to be unsteady. The CFD model has been validated against both analytical and experimental results. Simulation results showed a good agreement with both measurements and predictions, particularly when the Standard k-ω turbulence model is implemented inside the REWEC. The CFD model has been applied also to the simulation of both conventional and REWEC1 submerged breakwater placed into a two-dimensional wave fume, obtaining a novel method for the valuation of the REWEC1 absorption coefcient. In fact, when considering the interaction of waves with a conventional submerged breakwater, the incident wave energy is shared into: a refected ...
CFD modelling of breakwaters embedding wave energy converters
In recent years the raising supply and environmental problems related to traditional fossil fuel exploitation for energy production have pushed the research on renewable sources. Among these, sea waves have a high potential, but still poorly used. Different technologies have been developed in order to harness wave energy, and the Oscillating Water Column (OWC) devices are the most accredited for an actual diffusion. This work is focused on the performance analysis of particular OWC-type devices, namely the REWECs (REsonant sea Wave Energy Converter). Two different versions have been considered, the REWEC1 and the REWEC3, constituting a submerged and an emerged breakwater, respectively. The most interesting aspect of REWECs is the possibility to operate them under resonant conditions with that sea state which is the one that gives the highest yearly energy contribution. Both REWEC1 and REWEC3 dynamic behavior can be approximated by means of a mass-spring-damper system. According to this approximation, a criterion for evaluating the oscillating natural frequency of the REWECs has been derived. A CFD model has been developed in order to verify the resonance behaviour of a scaled REWEC1 device. The water-air interaction has been taken into account by means of the Volume Of Fluid (VOF) model implemented in the commercial code Ansys Fluent. Both air and water fow felds have been assumed to be unsteady. The CFD model has been validated against both analytical and experimental results. Simulation results showed a good agreement with both measurements and predictions, particularly when the Standard k-ω turbulence model is implemented inside the REWEC. The CFD model has been applied also to the simulation of both conventional and REWEC1 submerged breakwater placed into a two-dimensional wave fume, obtaining a novel method for the valuation of the REWEC1 absorption coefcient. In fact, when considering the interaction of waves with a conventional submerged breakwater, the incident wave energy is shared into: a refected ...
CFD modelling of breakwaters embedding wave energy converters
01.01.2018
doi:10.60576/poliba/iris/scarpetta-filippo_phd2018
Hochschulschrift
Elektronische Ressource
Englisch
DDC:
690
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