CFD design-load analysis of a two-body wave energy converter

Coe, Ryan G.; Rosenberg, Brian; Quon, Eliot; Chartrand, Chris; Yu, Yi Hsiang; Rij, Jennifer van; Mundon, Tim

doi:10.1007/s40722-019-00129-8

Cited by 22 publications

(19 citation statements)

References 21 publications

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“…The grid shown in Figure 5 was attained with grid resolution and convergence studies, including those reported in [2], an example of which is provided in Figure 6. The refined grid regions were established based on guidance from STAR-CCM+ [24], previously reported extreme sea state CFD studies [6,9,[25][26][27][28], accurately modeling the wave propagation, minimizing wave reflections, minimizing y+ on the RM3 model surface, and accurately resolving the velocity gradients around the model while keeping the total number of cells at a minimum. The final grid resolutions at the water surface and total number of cells for each case are reported in Table 3.…”

Section: Regular Wave Simulationsmentioning

confidence: 99%

“…The MLER design wave approach is predicated on the assumption that the nonlinear response can be approximated by a linearized response, and the nonlinear response is a small perturbation of the linear solution. Focused wave approaches have been successfully used in previous studies to evaluate design loads, where the hydrodynamic bodies and wave parameters do not result in interactions that are highly nonlinear [6,25,26,28]. However, in this study, the STAR-CCM+ simulations show highly nonlinear interactions in response to the applied MLER waves, including overtopping and complete submersion, the float and mooring lines rising fully out of the water, large rigid body motions, vortex shedding, flow separation, turbulence, and a strong coupling between the nonlinear hydrodynamic loading, mooring forces, and pitch motions; all of which the linear MLER approach cannot predict.…”

Section: Star-ccm+ Most-likely Extreme Response-focused Wave Simulatimentioning

confidence: 99%

“…For WEC configurations in which responses are mostly linear, the design load evaluation framework used in this study will suffice, as shown in previous studies [6,28]. However, based on the results of this study, when using the generalized body modes method, for anything but the simplest geometries, multiple mode shapes of each type and/or FEA-derived mode shapes should be used to obtain accurate structural load estimates using low-and mid-fidelity modeling methods.…”

mentioning

confidence: 94%

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A Wave Energy Converter Design Load Case Study

Rij

Guo

et al. 2019

JMSE

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This article presents an example by which design loads for a wave energy converter (WEC) might be estimated through the various stages of the WEC design process. Unlike previous studies, this study considers structural loads, for which, an accurate assessment is crucial to the optimization and survival of a WEC. Three levels of computational fidelity are considered. The first set of design load approximations are made using a potential flow frequency-domain boundary-element method with generalized body modes. The second set of design load approximations are made using a modified version of the linear-based time-domain code WEC-Sim. The final set of design load simulations are realized using computational fluid dynamics coupled with finite element analysis to evaluate the WEC's loads in response to both regular and focused waves. This study demonstrates an efficient framework for evaluating loads through each of the design stages. In comparison with experimental and high-fidelity simulation results, the linear-based methods can roughly approximate the design loads and the sea states at which they occur. The high-fidelity simulations for regular wave responses correspond well with experimental data and appear to provide reliable design load data. The high-fidelity simulations of focused waves, however, result in highly nonlinear interactions that are not predicted by the linear-based most-likely extreme response design load method.

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Section: Regular Wave Simulationsmentioning

confidence: 99%

Section: Star-ccm+ Most-likely Extreme Response-focused Wave Simulatimentioning

confidence: 99%

mentioning

confidence: 94%

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A Wave Energy Converter Design Load Case Study

Rij

Guo

et al. 2019

JMSE

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“…To better investigate behavior in the tail region, we thus consider the complementary cumulative distribution functions (CCDF). The tendon tension responses are shown in Figure 5, and more details of the study are presented in [2]. Finally, a comparison was presented between the design loads predicted by the mid-fidelity model, the CFD model and the physical model tests, and based on this comparison.…”

Section: Phase I -Task 1: Mid-fidelity Model Hydrodynamic Coefficientsmentioning

confidence: 99%

Survivability Enhancement of a Multi-Mode Point Absorber (CRADA CRD-16-631 Final Report)

Rij

2020

Self Cite

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“…Gallizio et al [26] studied the dynamics of an inertial wave energy converter by coupled a CFD method with a dynamic model of the power generation system. Coe et al [27] predicted extreme loading in a two-body WEC using a combination of a time-domain model based on linearized potential theory and CFD method based on unsteady Reynolds-averaged Navier-Stokes equation. CFD is considered to be a good choice to analyze the hydrodynamic performance of WEC especially for real sea situation [28,29].…”

Section: Introductionmentioning

confidence: 99%

Study on the Optimal Wave Energy Absorption Power of a Float in Waves

Luan

Zhang

et al. 2019

JMSE

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The utilization of ocean renewable energy, especially wave energy, is of great significance in ocean engineering. In this study, a three-dimensional numerical wave tank was established to simulate the wave-float interaction based on the Reynolds-averaged Navier–Stokes equations and the Realizable K-Epsilon Two-Layer turbulence model was applied. Firstly, convergence studies with respect to the mesh and time step were carried out and confirmed by the published analytical and numerical data. Then, the resonance condition of a particular float was solved by both numerical and analytical methods. The numerical and the analytical results are mutually verified in good agreements, which verify the reliability of the analytical process. Furthermore, a wave energy converter (WEC) consisting of a single float without damping constant was adopted, and its hydrodynamic performance in different wave conditions was investigated. It was found that the damping factor can affect the motion response of the float and the wave force it receives. Under a certain wavelength condition, the WEC resonates with the wave, at which the wave force on the float, displacement of the float and other parameters reach a maximum value. Finally, the influence of linear damping constant on the power take-off (PTO) was studied. The results show that the damping factor does not affect the wave number turning point of the optimal damping constant.

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CFD design-load analysis of a two-body wave energy converter

Cited by 22 publications

References 21 publications

A Wave Energy Converter Design Load Case Study

A Wave Energy Converter Design Load Case Study

Survivability Enhancement of a Multi-Mode Point Absorber (CRADA CRD-16-631 Final Report)

Study on the Optimal Wave Energy Absorption Power of a Float in Waves

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