Technical and Economic Readiness Review of CFD-Based Numerical Wave Basin for Offshore Floater Design

im, Jang Whan; Jang, Hyunchul; Baquet, Aldric; O’Sullivan, Jim; Lee, Sungwok; Kim, Booki; Jasak, Hrvoje

doi:10.4043/27294-ms

Cited by 17 publications

(14 citation statements)

References 13 publications

(10 reference statements)

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“…Although CNWTs are more computationally costly than their lower fidelity counterparts, CNWT experiments can deliver accurate results in high resolution, which is particularly useful for the investigation of specific flow phenomena around coastal and offshore structures. Numerous studies are reported and reviewed in [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22], where CNWTs are employed for the analysis of different marine engineering problems.…”

Section: Computational Fluid Dynamics-based Numerical Wave Tanksmentioning

confidence: 99%

On the Assessment of Numerical Wave Makers in CFD Simulations

Windt

Davidson

Schmitt

et al. 2019

JMSE

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A fully non-linear numerical wave tank (NWT), based on Computational Fluid Dynamics (CFD), provides a useful tool for the analysis of coastal and offshore engineering problems. To generate and absorb free surface waves within a NWT, a variety of numerical wave maker (NWM) methodologies have been suggested in the literature. Therefore, when setting up a CFD-based NWT, the user is faced with the task of selecting the most appropriate NWM, which should be driven by a rigorous assessment of the available methods. To provide a consistent framework for the quantitative assessment of different NWMs, this paper presents a suite of metrics and methodologies, considering three key performance parameters: accuracy, computational requirements and available features. An illustrative example is presented to exemplify the proposed evaluation metrics, applied to the main NWMs available for the open source CFD software, OpenFOAM. The considered NWMs are found to reproduce waves with an accuracy comparable to real wave makers in physical wave tank experiments. However, the paper shows that significant differences are found between the various NWMs, and no single method performed best in all aspects of the assessment across the different test cases.

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Section: Computational Fluid Dynamics-based Numerical Wave Tanksmentioning

confidence: 99%

On the Assessment of Numerical Wave Makers in CFD Simulations

Windt

Davidson

Schmitt

et al. 2019

JMSE

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“…Kim et al [19,20,21] have solved the problem of reflected waves without increasing the number of girds using Euler Overlay method(EOM). In this study, the Euler Overlay Method (EOM) was applied to simulate waves accurately without numerical damping in the 0.5L of inlet region.…”

Section: Numerical Setup and Calculation Conditionsmentioning

confidence: 99%

Numerical Study on the Prediction of the Bow Flare Slamming Pressure for the Container Ship in Regular Wave

Seo

Jeong²

2019

brod

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A container ship has large flare on the bow flare region to accommodate more container recently. This flare region experiences the impact pressure due to slamming phenomenon under rough sea conditions. The impact pressure is transferred to the hull structure and the impact pressure causes structural damage. A strength assessment of the bow region is evaluated based on the empirical formulas according to various classifications. In this study, the numerical simulations were performed to compare with empirical method, and predict the bow flare slamming pressure on the container ship. It is found that the bow flare slamming pressure generated up to 625kPa near 0.975 station and the bow flare slamming pressure obtained from the formulas of the CSR and ABS tend to be similar to the CFD results.

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“…Mooring forces are handled via the interface to the 6-DOF ODE solver, either in terms of linear/torsional spring/damper system, or a direct interface to external mooring model software. Model performance and technical readiness of such a model for practical offshore floater design has been reported by Kim et al in [35].…”

Section: Mooring Systems Propulsion and Sailingmentioning

confidence: 99%

CFD Analysis in Subsea and Marine Technology

Jasak

2017

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. Computational Fluid Dynamics (CFD) is established in design and analysis for a range of industries, but its use in Marine and Naval Hydrodynamics is behind the trend. This can be attributed to the complexity of modelling needs, including presence of free surface, irregular transient flows, fluid-structure coupling and presence of established modelling tools based on potential theory.In this paper, state-of-the-art of CFD in Naval Hydrodynamics, wave and offshore applications is given, with an update of recent advances, validation and computing requirements for typical simulation cases. IntroductionSince the beginning of the 21st century, Computational Fluid Dynamics (CFD) has become well established across the range of engineering applications. CFD results are well understood, expectations on accuracy in design studies can be satisfied. For example, automotive industry uses CFD to significantly reduce the use of experimental studies in aerodynamics, internal combustion engine design and exhaust gas after-treatment. Indeed, CFD studies are now regularly performed in applications which were never properly analysed experimentally, such as passenger compartment comfort, vehicle soiling and acoustics-related phenomena, where the design primarily relies on CFD results.Acceptance of CFD in marine engineering, naval hydrodynamics and evaluation of wave loads appears to be lagging behind the trend of other industries. This is partially due to the complexity of free surface flows, but mainly by the fact that the phenomena under consideration imply significantly higher computational requirements. For example, sea-keeping studies of ships in irregular waves or calculation of transfer functions for wave loading on floating structures still cannot be performed at acceptable speed. "Engineering time-scale" in product design requires turn-over time of 8-12 hours for simulations to be practically useful.An important factor in the acceptance of CFD is the presence of alternative simulation tools. Numerical models based on potential flow theory are widely accepted, fast and validated and have been in use for more than a decade. The potential flow assumption, whole adequate for a part of industrial needs, brings it own limitations, mainly due to the formulation, or failure to account for coupled/non-linear effects. The best example is the evaluation of added resistance in waves, which may provide adequate loading results on the hull, but cannot account for forward speed of the ship.The challenges for CFD modelling in naval hydrodynamics can be grouped as follows:

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Technical and Economic Readiness Review of CFD-Based Numerical Wave Basin for Offshore Floater Design

Cited by 17 publications

References 13 publications

On the Assessment of Numerical Wave Makers in CFD Simulations

On the Assessment of Numerical Wave Makers in CFD Simulations

Numerical Study on the Prediction of the Bow Flare Slamming Pressure for the Container Ship in Regular Wave

CFD Analysis in Subsea and Marine Technology

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