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Numerical investigation of wave impact characteristics on a vertical wall for the oscillating piston-type wave generator

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Abstract

The wave impact behavior on any structural body needs to be understood for the sustainability of the structure and even to harness the energy from the wave. An oscillating piston-type wave generator with different channel lengths ranging from 4 to 10 m and water heights ranging from 0.3 to 0.7 m is considered. For wave propagation, 2D numerical simulations are performed using the Reynolds Averaged Navier–Stokes (RANS) equations and the realizable k–ε model, with the VOF method also used to track the wave surfaces. Simulation results exhibit that the shorter channel length and the smaller wave height make the irregular shape of the wave propagating along the channel. With the increasing of channel lengths and wave heights, the wave patterns do, nevertheless, take on regular forms, i.e., sinusoidal patterns. It is also discovered that the initial wave covers a longer channel length than the propagating wave. The wave impact characteristics are obtained from the simulation results for the first wave which is impacting the vertical wall. It is found that wave impact covers the wider space on the vertical wall for a shorter channel length with a smaller water height. In addition, the simulation results show that the wave's impact on a vertical wall exhibits greater pressure when impacting upwardly than when impacting downwardly. In fact, the vertical velocity component of the wave during the upward impact on the vertical wall is 1.5 times higher than that of the downward impact. Simulation results are validated with the available literature.

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The authors wish to thank all who assisted in conducting this work.

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Correspondence to D. H. Ahmed.

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The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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Poran, S., Saha, B. & Ahmed, D.H. Numerical investigation of wave impact characteristics on a vertical wall for the oscillating piston-type wave generator. Int J Energ Water Res 7, 327–345 (2023). https://doi.org/10.1007/s42108-022-00224-x

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  • DOI: https://doi.org/10.1007/s42108-022-00224-x

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