Comparison of CFD simulations with experimental data for a tanker model advancing in waves

Orihara, Hideo

doi:10.3744/jnaoe.2011.3.1.001

Cited by 6 publications

(4 citation statements)

References 5 publications

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“…Therefore, further development of the WISDAM-XI code was undertaken to produce a numerical tool for predicting resistance and seakeeping performance, including the ride-comfort factor, for multi-hull vessels, by way of a CFD approach. The numerical method employed was based on the WISDAM-V code, 29 ) extended to the overlapping grid system previously incorporated in the WISDAM-X version of the code, 31 , 41 ) as described in the previous section. For the simulation of multi-hull vessels, WISDAM-V motion was modified to incorporate a multi-block grid system approach, in order to deal with a multi-hull vessel configuration.…”

Section: Motion and Ride-comfort Predictions For Multi-hull Vessels Umentioning

confidence: 99%

Nonlinear ship waves and computational fluid dynamics

Miyata

Orihara

Sato

2014

Proceedings of the Japan Academy. Ser. B: Physical and Biologic

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Research works undertaken in the first author’s laboratory at the University of Tokyo over the past 30 years are highlighted. Finding of the occurrence of nonlinear waves (named Free-Surface Shock Waves) in the vicinity of a ship advancing at constant speed provided the start-line for the progress of innovative technologies in the ship hull-form design. Based on these findings, a multitude of the Computational Fluid Dynamic (CFD) techniques have been developed over this period, and are highlighted in this paper. The TUMMAC code has been developed for wave problems, based on a rectangular grid system, while the WISDAM code treats both wave and viscous flow problems in the framework of a boundary-fitted grid system. These two techniques are able to cope with almost all fluid dynamical problems relating to ships, including the resistance, ship’s motion and ride-comfort issues. Consequently, the two codes have contributed significantly to the progress in the technology of ship design, and now form an integral part of the ship-designing process.

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Section: Motion and Ride-comfort Predictions For Multi-hull Vessels Umentioning

confidence: 99%

Nonlinear ship waves and computational fluid dynamics

Miyata

Orihara

Sato

2014

Proceedings of the Japan Academy. Ser. B: Physical and Biologic

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“…In the case of predicting ship wave loads with interface-capturing methods, several previous studies have contributed to this task, e.g. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. Even if such studies already exist, it is difficult to reach general conclusions on the validity of these methods.…”

Section: Introductionmentioning

confidence: 99%

“…[1-3, 5, 6, 8-14, 16], but the examples of studies on local loads like pressure histories are fewer in number, e.g. [4,7,12,15].…”

Section: Introductionmentioning

confidence: 99%

Computational and experimental study on local ship loads in short and steep waves

2013

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Currently, little information exists on the validity of interface-capturing methods in predicting local ship wave loads in short and steep waves. This study compares computational and experimental results in such a case (kA = 0.24, L wave /L ship = 0.16). The results allow the variation of wave loading between ten locations in the bow area of the ship to be observed. The computations were performed with an unstructured RANS solver that models free-surface flows with a volume-of-fluid method. In the model tests, the wave loads were measured with pressure sensors. The analysis of the results focuses on the wave conditions and on the pressure histories of the local wave loads. The computational and experimental results are in good qualitative agreement and encourage the further use of the computational results.

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“…한편, 전산기의 지속적인 발달로 인해 파랑 중 전진하는 선박 에 대해서도 수치해석(numerical analysis)이 수행되고 있으나 (Sadat-Hosseini, et al, 2010;Simonsen & Stern, 2010;Orihara, 2011;Kim, et al, 2015), …”

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Nominal Wake Measurement for KVLCC2 Model Ship in Regular Head Waves at Fully Loaded Condition

Kim¹,

Jang²,

Hwang³

et al. 2016

Journal of the Society of Naval Architects of Korea

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This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License(http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.In the ship design process, ship motion and propulsion performance in sea waves became very important issues. Especially, prediction of ship propulsion performance during real operation is an important challenge to ship owners for economic operation in terms of fuel consumption and route-time evaluation. Therefore, it should be considered in the early design stages of the ship. It is thought that the averaged value and fluctuation of effective inflow velocity to the propeller have a great effect on the propulsion performance in waves. However, even for the nominal velocity distribution, very few results have been presented due to some technical difficulties in experiments. In this study, flow measurements near the propeller plane using a stereo PIV system were performed. Phase-averaged flow fields on the propeller plane of a KVLCC2 model ship in waves were measured in the towing tank by using the stereo PIV system and a phase synchronizer with heave motion. The experiment was carried out at fully loaded condition with making surge, heave and pitch motions free at a forward speed corresponding to Fr=0.142 (Re=2.55×106) in various head waves and calm water condition. The phase averaged nominal velocity fields obtained from the measurements are discussed with respect to effects of wave orbital velocity and ship motion. The low velocity region is affected by pressure gradient and ship motion.

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Comparison of CFD simulations with experimental data for a tanker model advancing in waves

Cited by 6 publications

References 5 publications

Nonlinear ship waves and computational fluid dynamics

Nonlinear ship waves and computational fluid dynamics

Computational and experimental study on local ship loads in short and steep waves

Nominal Wake Measurement for KVLCC2 Model Ship in Regular Head Waves at Fully Loaded Condition

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