URANS study of scale effects on hydrodynamic manoeuvring coefficients of KVLCC2

Jin, Yuting; Duffy, Jonathan; Chai, Shuhong; Chin, Christopher; Bose, Neil

doi:10.1016/j.oceaneng.2016.03.022

Cited by 27 publications

(5 citation statements)

References 18 publications

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“…Finally, it is found that the computations at full-scale show that the propeller operates more efficiently. In the paper of Jin et al [18], the authors investigated the scale effect on manoeuvring coefficients of KVLCC2 using a RANS solver. Hydrodynamic performance of the hull was observed by conducting static drift and pure sway analyses.…”

Section: Introductionmentioning

confidence: 99%

Scale effect on ship resistance components and form factor

2020

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To design eco-friendly ships, the hydrodynamic behaviour of the hull has to be estimated precisely.The first and foremost one is the ship resistance, which is closely related to the energy efficiency of the ship. Different extrapolation methods, based on different assumptions, have been used to predict the full-scale ship resistance from model-scale experiments. In this manner, it is important to understand the scale effect on the individual ship resistance components. In this study, URANS CFD simulations of KCS and KVLCC2 were conducted at different scales. The total resistance components were decomposed into the individual resistance components to investigate the scale effects. The simulation results were compared with full-scale resistance predictions using different extrapolation methods and the rationale of the different compliances between them was investigated. Finally, the hydrodynamic characteristics in different scales were examined.

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Section: Introductionmentioning

confidence: 99%

Scale effect on ship resistance components and form factor

2020

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“…In addition, lateral distance between wall and body was 2 L. First-order temporal and second-order convection schemes were applied for temporal and momentum equations, respectively, to be applied to perform spatial discretization. Jin et al [23] and He et al [24] applied the k − ω Shear Stress Transfer (SST) turbulence model to analyze the Reynolds averaged Navier-Stokes (RANS) equation and obtained satisfactory results. In the current work, the k − ω SST turbulence model was also applied.…”

Section: Hydrodynamics Analysismentioning

confidence: 99%

Study on the Dynamic Responses of a Large Caisson during Wet-Towing Transportation

Wang

Zhai

et al. 2021

Water

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Large caissons are extensively applied as deep-water foundations in marine engineering. In fact, caissons are generally prefabricated and transported to project site by wet towing. Motion responses of large caissons and those occurring during the towing process were investigated, and CO2 emissions under various conditions were calculated. These are all considered to ensure towing safety and environmental protection. The caisson resistance coefficient was simulated via Ansys Fluent software. The effects of towrope length, towing speed, and drift depth on the motion responses of caissons under the combined action of wind and wave were evaluated via Ansys AQWA software. Maximum heave value was dominantly affected by rope length and draft depth, and its fluctuation was highly influenced by towing speed and draft depth. However, all of the above mentioned factors had insignificant influences on pitch response. When towing existed, rope tension was rapidly increased from zero to a constant value that depended on towing speed and drift depth. However, the speed of achieving this stable phase depended on the length of the towrope.

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“…To evaluate the flow around the vehicle, a model based on RANS equations was used. Assuming the fluid is incompressible, the mean flow field governed by the RANS equations can be expressed as [9]:…”

Section: A Rans Equationsmentioning

confidence: 99%

A comprehensive comparison of computational methods on propeller modelling of an AUV

Ang

Fan

Jin

et al. 2018

2018 IEEE/OES Autonomous Underwater Vehicle Workshop (AUV)

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The propeller of a self-propelled marine vehicle is the key to understanding the hull-propeller interactions. The presence of a propeller not only provides the necessary propulsion force, but also significantly modifies the flow field around the marine vehicle. This modification made to flow field influences the hydrodynamic loading experienced by the marine vehicle and thus has an impact on its maneuvering characteristics. There are various methods to represent the actions of a propeller for a range of marine applications within CFD. Actuator disc or virtual disc is one of the earliest and most commonly used approach. This approach solves the body force generated as an equally distributed force over a cylindrical disc while ignoring the geometry of the propeller. Another method to evaluate the force of a propeller is direct simulations, which replicate a propeller based on its true geometry within CFD. This method utilizes the overset mesh technology within CFD that enables the propeller to rotate independently with respect to the background mesh. The present paper primarily used commercially available CFD software package, Star-CCM+ to investigate the accuracy and feasibility of representing the propeller of an Explorer Class AUV using the earlier mentioned methods. The solved advance ratio, and forward velocity from the two methods was benchmarked against openwater trial data.

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URANS study of scale effects on hydrodynamic manoeuvring coefficients of KVLCC2

Cited by 27 publications

References 18 publications

Scale effect on ship resistance components and form factor

Scale effect on ship resistance components and form factor

Study on the Dynamic Responses of a Large Caisson during Wet-Towing Transportation

A comprehensive comparison of computational methods on propeller modelling of an AUV

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