Numerical study of the motions and drift force of a floating OWC device

Hong, Do-Chun; Hong, Sa Young; Hong, Seok-Won

doi:10.1016/s0029-8018(03)00118-5

Cited by 45 publications

(19 citation statements)

References 4 publications

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“…Therefore, it is important to carry out an integrated analysis for floating structures. However, thus far only limited studies have been performed (Greco et al, 2009;Hong et al, 2004;Koo and Kim, 2005). In the present study, a Computational Fluid Dynamics (CFD) model is developed for the coupled dynamic analysis of an offshore floating oil storage tank in waves.…”

Section: Introductionmentioning

confidence: 99%

Prediction of the mooring force of a 2-D floating oil storage tank

Chu

Dong

Zhao

2014

J. Ocean Univ. China

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A Constrained Interpolation Profile (CIP)-based model is developed to predict the mooring force of a two-dimensional floating oil storage tank under wave conditions, which is validated against to a newly performed experiment. In the experiment, a box-shaped floating oil storage apparatus is used. Computations are performed by an improved CIP-based Cartesian grid model, in which the THINC/SW scheme (THINC: tangent of hyperbola for interface capturing; SW: Slope Weighting), is used for interface capturing. A multiphase flow solver is adopted to treat the water-air-body interactions. The Immersed Boundary Method (IBM) is implemented to treat the body surface. Main attention is paid to the sum force of mooring line and velocity field around the body. It is found that the sum force of the mooring line increases with increasing wave amplitude. The body suffers from water wave impact and large body motions occur near the free surface. The vortex occurs near the sharp edge, i.e., the sharp bottom corners of the floating oil storage tank and the vortex shedding can be captured by the present numerical model. The present model could be further improved by including turbulence model which is currently under development. Comparison between the computational mooring forces and the measured mooring forces is presented with a reasonable agreement. The developed numerical model can predict the mooring line forces very well.

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Section: Introductionmentioning

confidence: 99%

Prediction of the mooring force of a 2-D floating oil storage tank

Chu

Dong

Zhao

2014

J. Ocean Univ. China

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“…Lee et al 13,14 have further studied OWC numerically, and extended their boundary element method code WAMIT 15 by including the generalized modes to the conventional 6-degree of freedom (DOF) motions in such a way that the independent motions of the interior water surface (IWS) can be easily included and analysed by simply specifying the relevant normal velocities on the interested boundaries. Hong et al 4,5 gave a detailed derivation of the potential theory for floating OWC wave energy converters by including an assumed linear air flow through a duct/orifice. In all these studies, incompressible air is assumed.…”

Section: Introductionmentioning

confidence: 99%

On thermodynamics in the primary power conversion of oscillating water column wave energy converters

Sheng¹,

Alcorn²,

Lewis³

2013

Journal of Renewable and Sustainable Energy

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Type of publicationArticle (peer-reviewed) The paper presents an investigation to the thermodynamics of the air flow in the air chamber for the oscillating water column wave energy converters, in which the oscillating water surface in the water column pressurizes or de-pressurises the air in the chamber. To study the thermodynamics and the compressibility of the air in the chamber, a method is developed in this research: the power take-off is replaced with an accepted semi-empirical relationship between the air flow rate and the oscillating water column chamber pressure, and the thermodynamic process is simplified as an isentropic process. This facilitates the use of a direct expression for the work done on the power take-off by the flowing air and the generation of a single differential equation that defines the thermodynamic process occurring inside the air chamber. Solving the differential equation, the chamber pressure can be obtained if the interior water surface motion is known or the chamber volume (thus the interior water surface motion) if the chamber pressure is known. As a result, the effects of the air compressibility can be studied. Examples given in the paper have shown the compressibility, and its effects on the power losses for large oscillating water column devices. V C 2013 American Institute of Physics.

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“…In the calculation, the influence of the irregular frequencies is eliminated by the new boundary integral equation established by adding constant potential on the object surface. The above method is more accurate and efficient than the constant element method in solving problems concerning complex structures of FPSO, which lays a solid foundation for the solutions of the second order wave force problems [18][19][20]. Sections 2-4 in this paper elaborate basic equations of the three dimensional higher-order boundary element method for solving the added mass and damping of FPSO platform.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of added mass and damping of floating production, storage and offloading system

Wang

Zhang

et al. 2012

Acta Mech Sin

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An integral equation approach is utilized to investigate the added mass and damping of floating production, storage and offloading system (FPSO system). Finite water depth Green function and higher-order boundary element method are used to solve integral equation. Numerical results about added mass and damping are presented for odd and even mode motions of FPSO. The results show robust convergence in high frequency range and can be used in wave load analysis for FPSO designing and operation.

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Numerical study of the motions and drift force of a floating OWC device

Cited by 45 publications

References 4 publications

Prediction of the mooring force of a 2-D floating oil storage tank

Prediction of the mooring force of a 2-D floating oil storage tank

On thermodynamics in the primary power conversion of oscillating water column wave energy converters

Numerical analysis of added mass and damping of floating production, storage and offloading system

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