Computation of flow features and hydrodynamic coefficients around heave plates oscillating near a seabed

Garrido, Carlos Antônio; Thiagarajan, Krish; Souto-Iglesias, Antonio; Colagrossi, A.; Bouscasse, Benjamin

doi:10.1016/j.jfluidstructs.2015.10.003

Cited by 34 publications

(11 citation statements)

References 20 publications

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“…The validation of the numerical simulation is a requirement to determine the accuracy level for simulating real physics. Because of this, the CFD results of the hydrodynamic coefficients for an oscillating single disk are compared to corresponding data of the same case in the study of Garrido-Mendoza et al 9 as shown in Figure 1. The Volume-of-Fluid (VOF) technique is used for modeling of two-phase flow of air and water similar to Mendoza's research.…”

Section: Requirements For the Numerical Modelmentioning

confidence: 99%

“…Therefore, accurate resolution of the boundary layer cannot be the dominant factor for the computed force applying on disk. 9 Despite this point of view, for the considered case study the mesh grids near the wall are adjusted to be accurately fine. Consequently, via a low y + value near 1, the frictional shear stress is also calculated with a reasonable precision.…”

Section: Requirements For the Numerical Modelmentioning

confidence: 99%

“…Since the vortex shedding due to the edges is the dominant factor on the heave plate damping, many numerical studies were performed based on the computational fluid dynamics. [4][5][6][7][8][9] A fully coupled Navier-Stokes solver in which continuity and momentum equations are solved simultaneously, is utilized in most of these researches for obtaining accurate values of damping and added mass of heave plates. It is noted that for extracting only the added mass some potential based codes can also be utilized.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Vortex shedding modes around oscillating non-uniform double heave plates

Abazari

Alvandi

Behzad

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part M:

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Multiple co-axial heave plates of uniform geometry are attached to offshore platforms for inducing damping and added mass. These effects generally decrease the magnitude of the dynamic response of the platform under applied environmental excitation forces. When spacing between heave plates is decreased the damping and added mass performance are altered due to their strong vortex interaction. A new non-uniform plate configuration is proposed that may create different hydrodynamic characteristics. The modes of vortex shedding around plate edges in a non-uniform arrangement under forced harmonic oscillation are investigated via the CFD method. Furthermore, a new simplified formula for the total theoretical added mass of a general non-uniform double disk is proposed when it is in the zone which vortex interaction take places. The results show that a non-uniform double disk has better hydrodynamic performance as compared to the uniform double configuration for a given spacing. It is also observed that the mode and direction of the vortex shedding are different for uniform and non-uniform arrangements in a given spacing and KC value.

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Section: Requirements For the Numerical Modelmentioning

confidence: 99%

Section: Requirements For the Numerical Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Vortex shedding modes around oscillating non-uniform double heave plates

Abazari

Alvandi

Behzad

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part M:

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“…It would be interesting to investigate in detail, using the CFD, the dissipation mechanisms. Such an attempt is being pursued in a recent reference [12,45].…”

Section: Added Mass and Dampingmentioning

confidence: 99%

Hydrodynamic coefficients and pressure loads on heave plates for semi-submersible floating offshore wind turbines: A comparative analysis using large scale models

López-Pavón

Souto-Iglesias²

2015

Renewable Energy

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a b s t r a c tHydrodynamic forces on heave plates for a semi-submersible floating offshore wind turbine are discussed herein. A model of one of the platform columns has been built. This allows for the fitting of either a plain solid plate or the real heave plate prototype design. The latter is equipped with a vertical flap at its edge. The influence of the flap on the hydrodynamic coefficients is investigated through a results comparison with the plain solid one. The model plate diameter is 1 m, thus becoming, to the authors' knowledge, the largest for which results have been published. Results from experiments, in which added mass and damping coefficients have been measured, are presented. This experimental campaign also comprised the direct measurement of dynamic pressures on both heave plates, a fundamental magnitude for the structural design, which, until now, had not been experimentally explored for this type of system. For comparative reasons, numerical simulations were also conducted following common industry standards, both with a wide-spread frequency domain panel method (WADAM) and a RANS CFD commercial code (ANSYS CFX). Finally, results are compared with literature and consistent non-dimensionalizations are sought, with the aim of making these results useful for preliminary design purposes. The authors believe this research could benefit the offshore wind industry by improving the hydrodynamic design of the concept.

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“…Philip et al(2013) compared the hydrodynamic performance of a spar hull by using model test methods and CFD simulations, and it was revealed that a reduced heave response could be achieved when a suitable spacing between the heave plates could be adopted. Garrido-Mendoza et al(2015) conducted analysis on flow features and hydrodynamic coefficients around heave plates oscillating near a seabed.…”

Section: Introductionmentioning

confidence: 99%

Investigation of heave response of the deepwater octagonal FDPSO using various heave plate configurations

Chenfang

Wang

2017

J. Marine. Sci. Appl.

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Heave plates can be employed to control undesirable heave motion amplitudes of the deepwater octagonal floating, drilling, production, storage, and offloading (FDPSO) platform. Numerical simulations and model tests were applied to analyze and investigate the hydrodynamic response and the feasibility of the heave plate configurations. The diameter and the depth below the free surface of a single-layer heave plate, as well as the spacing of two-layer heave plates, were considered as the primary variables when studying the effect of heave plates on FDPSO hydrodynamics. The analysis results indicate that the heave plate diameter significantly affects the heave hydrodynamics, and heave performance could be improved with an increased diameter. In addition, increasing the depth below the free surface of a single-layer heave plate does not effectively suppress the heave motion within the range of draft depths tested. The target FDPSO obtained better heave characteristics with increased spacing between the two-layer heave plates. Furthermore, the global performances of the octagonal FDPSO with these typical heave plate configurations were comparatively analyzed. The results indicate that from a hydrodynamic point of view, the single-layer heave plate configuration has an advantage over the two-layer heave plate configuration.

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Computation of flow features and hydrodynamic coefficients around heave plates oscillating near a seabed

Cited by 34 publications

References 20 publications

Vortex shedding modes around oscillating non-uniform double heave plates

Vortex shedding modes around oscillating non-uniform double heave plates

Hydrodynamic coefficients and pressure loads on heave plates for semi-submersible floating offshore wind turbines: A comparative analysis using large scale models

Investigation of heave response of the deepwater octagonal FDPSO using various heave plate configurations

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