Wave Scattering by Twin Surface-Piercing Plates Over A Stepped Bottom: Trapped Wave Energy and Energy Loss
- 46 Downloads
To evaluate the trapped wave energy and energy loss, the problem of wave scattering by twin fixed vertical surfacepiercing plates over a stepped bottom is numerically simulated using the open source package OpenFOAM and the associated toolbox waves2Foam. The volume of fluid (VOF) method was employed to capture the free surface in the time domain. The validation of the present numerical model was performed by comparing with both the analytical and experimental results. The effects of the spacing between two plates and the configuration of stepped bottom on the hydrodynamic characteristics, such as reflection and transmission coefficients, viscous dissipation ratio, and relative wave height between the plates (termed as trapped wave energy), were examined. Moreover, the nonlinear effects of the incident wave height on the hydrodynamic characteristics were addressed as well. The results show that the step configuration can be tuned for efficient-performance of wave damping, and the optimum configurations of the step length B, the step height h1 and the spacing b, separately equaling λ/4, 3h/4, and 0.05h (λ and h are the wavelength and the water depth, respectively), are recommended for the trapping of wave energy.
Key wordsOpenFOAM twin surface-piercing plates viscous dissipation wave nonlinearity trapped wave energy
Unable to display preview. Download preview PDF.
- Goda, Y. and Suzuki, Y., 1977. Estimation of incident and reflected waves in random wave experiments, Proceedings of the 15th Coastal Engineering Conference, ASCE, New York, pp. 828–845.Google Scholar
- Jasak, H., 1996. Error Analysis and Estimation for the Finite Volume Method With Applications to Fluid Flows, Ph.D. Thesis, Imperial College London, London.Google Scholar
- Kriebel, D.L. and Bollmann, C.A., 1996. Wave transmission past vertical wave barriers, Proceedings of the 25th International Conference on Coastal Engineering, ASCE, Orlando, Florida, pp. 2470–2483.Google Scholar
- Ning, D.Z., Shi, J., Teng, B. and Zhao, H.T., 2014. Numerical simulation of a land-based oscillating water column wave energy conversion device, Journal of Harbin Engineering University, 35(7), 789–794. (in Chinese)Google Scholar
- Ohkusu, M., 1974. Hydrodynamic forces on multiple cylinders in waves, Proceedings of International Symposium on the Dynamics of Marine Vehicles and Structures in Waves, Institute of Mechanical Engineers, London.Google Scholar
- Rusche, H., 2003. Computational Fluid Dynamics of Dispersed Twophase Flows at High Phase Fractions, Ph.D. Thesis, Imperial College London, London.Google Scholar
- Weller, H.G., 2002. Derivation, Modelling and Solution of the Conditionally Averaged Two-phase Flow Equations, Nabla Ltd.Google Scholar
- Wiegel, R.L., 1960. Transmission of waves past a rigid vertical thin barrier, Journal of the Waterways and Harbors Division, 86(1), 1–12.Google Scholar
- Windt, C., Davidson, J., Akram, B. and Ringwood, J.V., 2018. Performance assessment of the overset grid method for numerical wave tank experiments in the OpenFOAM environment, Proceedings of the ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering, Ocean, Offshore and Arctic Engineering Division, Madrid, Spain, pp. V010T09A006.Google Scholar