Numerical simulation of floating bodies in extreme free surface waves

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 surfa...

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Main Authors: Z. Z. Hu, D. M. Causon, C. G. Mingham, L. Qian
Format: Article
Language:English
Published: Copernicus Publications 2011-02-01
Series:Natural Hazards and Earth System Sciences
Online Access:http://www.nat-hazards-earth-syst-sci.net/11/519/2011/nhess-11-519-2011.pdf
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spelling doaj-2e652624234341f6833595d0cd535daa2020-11-24T22:46:35ZengCopernicus PublicationsNatural Hazards and Earth System Sciences1561-86331684-99812011-02-0111251952710.5194/nhess-11-519-2011Numerical simulation of floating bodies in extreme free surface wavesZ. Z. HuD. M. CausonC. G. MinghamL. QianIn 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. http://www.nat-hazards-earth-syst-sci.net/11/519/2011/nhess-11-519-2011.pdf
collection DOAJ
language English
format Article
sources DOAJ
author Z. Z. Hu
D. M. Causon
C. G. Mingham
L. Qian
spellingShingle Z. Z. Hu
D. M. Causon
C. G. Mingham
L. Qian
Numerical simulation of floating bodies in extreme free surface waves
Natural Hazards and Earth System Sciences
author_facet Z. Z. Hu
D. M. Causon
C. G. Mingham
L. Qian
author_sort Z. Z. Hu
title Numerical simulation of floating bodies in extreme free surface waves
title_short Numerical simulation of floating bodies in extreme free surface waves
title_full Numerical simulation of floating bodies in extreme free surface waves
title_fullStr Numerical simulation of floating bodies in extreme free surface waves
title_full_unstemmed Numerical simulation of floating bodies in extreme free surface waves
title_sort numerical simulation of floating bodies in extreme free surface waves
publisher Copernicus Publications
series Natural Hazards and Earth System Sciences
issn 1561-8633
1684-9981
publishDate 2011-02-01
description 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.
url http://www.nat-hazards-earth-syst-sci.net/11/519/2011/nhess-11-519-2011.pdf
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AT dmcauson numericalsimulationoffloatingbodiesinextremefreesurfacewaves
AT cgmingham numericalsimulationoffloatingbodiesinextremefreesurfacewaves
AT lqian numericalsimulationoffloatingbodiesinextremefreesurfacewaves
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