Robustness and quality of squat predictions in extreme shallow water conditions based on RANS-calculations

Bechthold, Jonas; Kastens, Marko

doi:10.1016/j.oceaneng.2019.106780

Cited by 20 publications

(8 citation statements)

References 10 publications

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“…Bechthold J et al [7] investigated the influence of different speeds on ship trim and squatting in shallow water through numerical simulation and predicted the trim and squatting of Postpanmax container ships in extremely shallow water. Pavkov M [8] studied the shallow water effect of two different trimaran models through a model experiment.…”

Section: Introductionmentioning

confidence: 99%

Experiment and numerical simulation study on resistance performance of the shallow-water seismic survey vessel

Xiong

et al. 2023

Ocean Engineering

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Section: Introductionmentioning

confidence: 99%

Experiment and numerical simulation study on resistance performance of the shallow-water seismic survey vessel

Xiong

et al. 2023

Ocean Engineering

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“…Seemontini Roy Choudhury et al [17] researched steady motions of drift and yaw based on a specific crude ship with the CFD solver SHIPFLOW both in deep and shallow waters, and the simulation results were in agreement with those from experiments. Using STARCCM+, Jonas Bechthold and Marko Kastens [18] simulated the sinking and trimming of three Postpanmax container ships in confined shallow waters. Their results showed good consistency with model test.…”

Section: Introductionmentioning

confidence: 99%

CFD Method to Study Hydrodynamics Forces Acting on Ship Navigating in Confined Curved Channels with Current

Yang

Kaidi

Lefrançois

2022

JMSE

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The bending section of the restricted channel is one of the most accident-prone areas for inland ships, but few clear investigations on the curvature effect have been conducted till now. Therefore, this paper presents numerical research of the curvature effect in confined bending channels on ship hydrodynamics. The unsteady Navier–Stokes equations closed by the realizable K-Epsilon turbulence model are utilized to simulate the flow around a three-dimensional inland ship. A mesh verification analysis is performed to select the most suitable grid size, and the CFD model is validated in a regular confined channel by comparing the numerical resistance forces with those from experiments. The impacts of the channel slope angle, channel radius, ship type (ship length), and current velocity in curved channels on ship hydrodynamics are studied with their influence patterns and mechanisms being analyzed in detail. Results show that channel radius only affects the yaw moment much, whereas ship hydrodynamics are greatly sensitive to the slope angle only when the angle is below a certain threshold value. Compared with short ships, much stronger spiral currents can be noticed passing through long ships in the same channel configuration. Current velocity affects both resistance and yaw moment a lot, with a critical current velocity for sway force.

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“…Specifically, although in model-scale computations, a significant portion of the ship hull is covered by a laminar layer, most turbulence models assume the flow is fully turbulent. Yet, results with accuracy of a few percentage error can be found in the open literature [1][2][3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

“…A second aspect inspiring this work partly stems from point (2) above. Although these may be of less interest to the naval architect, they carry their own importance nonetheless.…”

Section: Introductionmentioning

confidence: 99%

Virtual Replica of a Towing Tank Experiment to Determine the Kelvin Half-Angle of a Ship in Restricted Water

Terziev

Zhao

Tezdogan

et al. 2020

JMSE

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The numerical simulation of ship flows has evolved into a highly practical approach in naval architecture. In typical virtual towing tanks, the principle of Galilean relativity is invoked to maintain the ship as fixed, while the surrounding water is prescribed to flow past it. This assumption may be identified, at least partly, as being responsible for the wide-scale adoption of computational solutions within practitioners’ toolkits. However, it carries several assumptions, such as the levels of inlet turbulence and their effect on flow properties. This study presents an alternative virtual towing tank, where the ship is simulated to advance over a stationary fluid. To supplement the present work, the free surface disturbance is processed into Fourier space to determine the Kelvin half-angle for an example case. The results suggest that it is possible to construct a fully unsteady virtual towing tank using the overset method, without relying on Galilean relativity. Differences between theoretical and numerical predictions for the Kelvin half-angle are predominantly attributed to the assumptions used by the theoretical method. The methods presented in this work can potentially be used to validate free-surface flows, even when one does not have access to experimental wave elevation data.

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Robustness and quality of squat predictions in extreme shallow water conditions based on RANS-calculations

Cited by 20 publications

References 10 publications

Experiment and numerical simulation study on resistance performance of the shallow-water seismic survey vessel

Experiment and numerical simulation study on resistance performance of the shallow-water seismic survey vessel

CFD Method to Study Hydrodynamics Forces Acting on Ship Navigating in Confined Curved Channels with Current

Virtual Replica of a Towing Tank Experiment to Determine the Kelvin Half-Angle of a Ship in Restricted Water

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