Measurements of hydrodynamic forces, surface pressure, and wake for obliquely towed tanker model and uncertainty analysis for CFD validation

Kume, Kazuhiko; Hasegawa, Jun; Tsukada, Yoshiaki; Fujisawa, Junichi; Fukasawa, Ryohei; Hinatsu, Munehiko

doi:10.1007/s00773-005-0209-y

Cited by 36 publications

(18 citation statements)

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“…As a test case, the authors considered to simulate steady drifting motion of wigley hull and a tanker called KVLCC2M (Fig.4) in unbounded fluid for which the experimental data are available in publications 16,17) . For wigley hull only the straight ahead motion simulation has been conducted with three different grids to carry out the grid convergence study of the numerical result.…”

Section: Simulating Criteria For Subject Shipsmentioning

confidence: 99%

“…For unstructured grid the oscillations in result caused by the adoption of second order differencing scheme have been minimized through the implementation of a slope limiter algorithm in discretizing the diffusion term of the RANS equation. The verification and validation of the code were achieved through the comparison of the simulated hull forces and moment acting on a tanker and a wigley hull with experiment data 16,17) . The simulated distribution of wake at the propeller plane suggests a lack in the generation of turbulent kinetic energy in the boundary layer, which can be attributed to the adoption of wall function in the prediction of velocity distribution near the wall.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Investigation of Flow Field Around a Ship in Manoeuvring Motion

Amin

Hasegawa

2012

J.JASNAOE

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SummaryViscous flow simulation of flow field around ships for manoeuvrability prediction has become a highly sought after issue now-a-days among the ship hydrodynamicists. As potential flow theory still lacks the versatility to consider the viscosity and flow separation effects in calculation, RANS simulation has gained its popularity in calculating detailed pressure and shear force distributions around drifting ships. The objective of this research work is to investigate the patter of flow around a manoeuvring tanker. An in-house code using unstructured grid based RANS solver has been developed to investigate the behavior of a ship in drifting motion. For unstructured grid the oscillations caused by the adoption of second order differencing scheme have been minimized through the implementation of a slope limiter algorithm in discretizing the diffusion term of the Navier-Stokes equation. A double hull model has been implemented in the manoeuvring simulation instead of considering the free surface flow. This approximation is justified when the ship speed is considered to be quite low (Fr<0.2) during drifting motion.

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Section: Simulating Criteria For Subject Shipsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Flow Field Around a Ship in Manoeuvring Motion

Amin

Hasegawa

2012

J.JASNAOE

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“…In Table 3, the predicted resistance in deep water is compared to previous calculations and to the experiments 1 (indicated by D, with U D = 1.0%D) performed by MOERI [6]. Additionally, results from tests by Kume et al [23] with the KVLCC2M hull form (identical to the KVLCC2 except for some fairing of the propeller shaft) are added (U D = 3.3%D ). The KVLCC2M resistance value has been corrected for the difference in Reynolds number, using a form factor (1 + k) = 1.2.…”

Section: Straight Ahead Sailingmentioning

confidence: 99%

Viscous-Flow Calculations for KVLCC2 in Deep and Shallow Water

Toxopeus

2013

Computational Methods in Applied Sciences

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Abstract. In the SIMMAN 2008 workshop, the capability of CFD tools to predict the flow around manoeuvring ships has been investigated. It was decided to continue this effort but to extend the work to the flow around ships in shallow water. In this paper, CFD calculations for the KLVCC2 are presented. The aim of the study is to verify and validate the prediction of the influence of the water depth on the flow field and the forces and moments on the ship for a full-block hull form. An extensive numerical investigation has been conducted. For each water depth, several grid densities were used to investigate the discretisation error in the results. In general, the uncertainties were found to increase with increased flow complexity, i.e. for larger drift angles or yaw rates. A dependency of the uncertainty on the water depth was not found. The predicted resistance values were used to derive water-depth dependent form factors. Comparisons with resistance measurements and with an empirical formula given by Millward show good agreement for deep as well as for shallow water depths. The CFD results give insight into the forces and moments acting on the ship as a function of the drift angle, yaw rate and water depth. A clear dependence of the forces and moments on the water depth is found for steady drift conditions. For pure rotation, this dependence is much more complex and only develops fully for larger non-dimensional rotation rates. The paper shows that CFD is a useful tool when studying the flow around ships in restricted water depths.

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“…There are also a significant number of computational studies [26][27][28][29][30][31][32]. In addition, the KVLCC2 was one of the benchmark tests in the ship hydrodynamics CFD workshops Gothenburg 2000 [27] and Tokyo 2005 [24,33].…”

Section: Introductionmentioning

confidence: 99%

“…Comprehensive experimental data are available ranging from towing tank measurements [20][21][22][23][24] to wind tunnel experiments [25]. There are also a significant number of computational studies [26][27][28][29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of linear and nonlinear convection schemes on multidimensional non‐orthogonal grids with applications to KVLCC2 tanker

Ismail

Carrica

Xing

et al. 2009

Numerical Methods in Fluids

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SUMMARYAlmost all evaluations of convection schemes reported in the literature are conducted using simple problems on uniform orthogonal grids; thus, having limited contribution when solving industrial computational fluid dynamics (CFD), where the grids are usually non-orthogonal with distortions. Herein, several convection schemes are assessed in uniform and distorted non-orthogonal grids with emphasis on industrial applications. Linear and nonlinear (TVD) convection schemes are assessed on analytical benchmarks in both uniform and distorted grids. To evaluate the performance of the schemes, four error metrics are used: dissipation, phase and L 1 errors, and the schemes' effective order of accuracy. Qualitative and quantitative deterioration of these error metrics as a function of the grid distortion metrics are investigated, and rigorous verifications are performed. Recommendations for effective use of the convection schemes based on the range of grid aspect ratio (AR), expansion ratio (ER) and skewness (Q) are included. A ship hydrodynamics case is studied, involving a Reynolds averaged Navier-Stokes simulation of a bare-hull KVLCC2 tanker using linear and nonlinear convection schemes coupled with isotropic and anisotropic Reynolds-stress (ARS) turbulence models using CFDShip-Iowa v4. Predictions of local velocities and turbulent quantities from the midships to the nominal wake plane are compared with experimental fluid dynamics (EFD), and rigorous verification and validation analyses for integral forces and moments are performed for 0 • and 12 • drift angles. Best predictions are observed when coupling a second-order TVD scheme with the anisotropic turbulence model. Further improvements are observed in terms of prediction of the vortical structures for 30 • drift when using TVD2S-ARS coupled with DES.

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Measurements of hydrodynamic forces, surface pressure, and wake for obliquely towed tanker model and uncertainty analysis for CFD validation

Cited by 36 publications

References 3 publications

Numerical Investigation of Flow Field Around a Ship in Manoeuvring Motion

Numerical Investigation of Flow Field Around a Ship in Manoeuvring Motion

Viscous-Flow Calculations for KVLCC2 in Deep and Shallow Water

Evaluation of linear and nonlinear convection schemes on multidimensional non‐orthogonal grids with applications to KVLCC2 tanker

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