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Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
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Volume 11, issue 2
Nat. Hazards Earth Syst. Sci., 11, 519–527, 2011
https://doi.org/10.5194/nhess-11-519-2011
© Author(s) 2011. This work is distributed under
the Creative Commons Attribution 3.0 License.

Special issue: Extreme and rogue waves

Nat. Hazards Earth Syst. Sci., 11, 519–527, 2011
https://doi.org/10.5194/nhess-11-519-2011
© Author(s) 2011. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 16 Feb 2011

Research article | 16 Feb 2011

Numerical simulation of floating bodies in extreme free surface waves

Z. Z. Hu, D. M. Causon, C. G. Mingham, and L. Qian Z. Z. Hu et al.
  • Centre for Mathematical Modelling and Flow analysis, School of Computing, Mathematics and Digital Technology, The Manchester Metropolitan University, Manchester, M1 5GD, UK

Abstract. In this paper, we use the in-house Computational Fluid Dynamics (CFD) flow code AMAZON-SC as a numerical wave tank (NWT) to study wave loading on a wave energy converter (WEC) device in heave motion. This is a surface-capturing method for two fluid flows that treats the free surface as contact surface in the density field that is captured automatically without special provision. A time-accurate artificial compressibility method and high resolution Godunov-type scheme are employed in both fluid regions (air/water). The Cartesian cut cell method can provide a boundary-fitted mesh for a complex geometry with no requirement to re-mesh globally or even locally for moving geometry, requiring only changes to cut cell data at the body contour. Extreme wave boundary conditions are prescribed in an empty NWT and compared with physical experiments prior to calculations of extreme waves acting on a floating Bobber-type device. The validation work also includes the wave force on a fixed cylinder compared with theoretical and experimental data under regular waves. Results include free surface elevations, vertical displacement of the float, induced vertical velocity and heave force for a typical Bobber geometry with a hemispherical base under extreme wave conditions.

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