Lucas J. Yiew

Lucas J. Yiew
Technology Centre for Offshore and Marine Singapore (TCOMS)

About

26
Publications
3,505
Reads
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143
Citations
Additional affiliations
September 2018 - present
Technology Centre for Offshore & Marine, Singapore (TCOMS)
Position
  • Researcher
July 2017 - July 2018
Nanyang Technological University
Position
  • Research Associate
July 2013 - May 2017
University of Adelaide
Position
  • Mathematics Tutor
Description
  • Tutor for Maths IM (2016), Maths IA (2013-2017), Maths IB (2014).
Education
July 2013 - December 2016
University of Adelaide
Field of study
  • Applied Mathematics
January 2011 - June 2013
Australian Maritime College
Field of study
  • Marine and Offshore Engineering
July 2009 - December 2010
University of South Australia
Field of study
  • Mechanical Engineering

Publications

Publications (26)
Article
Full-text available
The surge, heave and pitch motions of two solitary, thin, floating disks, extracted from laboratory wave basin experiments are presented. The motions are forced by regular incident waves, for a range of wave amplitudes and frequencies. One disk has a barrier attached to its edge to stop the incident waves from washing across its upper surface. It i...
Article
Collisions between two thin floating disks forced by regular water waves are studied for a range of wave amplitudes and lengths, using laboratory wave basin experiments and a mathematical model. Three collision regimes are identified from the experiments in terms of collision frequency and strength, and the collisions are shown to be caused by drif...
Article
Future state projection is an important prerequisite for the maritime autonomous surface ships (MASS) to initiate a collision-avoidance manoeuvre. Forecasts of MASS′ trajectories and motions are fundamentally based on the vessel's mathematical manoeuvring model, which is also referred to as the hydrodynamic digital twin nowadays. Using the benchmar...
Preprint
Full-text available
The propulsive performance of a benchmark azimuthing stern drive (ASD) tug is evaluated through a series of model-scale experiments and numerical simulations. Thruster-thruster and hull-thruster interactions are individually analysed by isolating each effect through a system of openwater, appended hull and free-running tests. Parametric studies are...
Article
In this study, a method is proposed to derive ocean surface current conditions using only information available through AIS – mainly speed over ground (SOG), course over ground (COG) and vessel heading. This method allows the mapping of current conditions over large areas, in doing so gives seafarers better awareness and advance warning of local en...
Article
The propulsive performance of a benchmark azimuthing stern drive (ASD) tug is evaluated through a series of model-scale experiments and numerical simulations. Thruster–thruster and hull–thruster interactions are individually analysed by isolating each effect through a system of openwater, appended hull and free-running tests. Parametric studies are...
Preprint
Full-text available
Interactions between a vessel's hull and its propulsor are important design and engineering considerations. For vessels equipped with azimuthing propulsors, these interactions are compounded due to the ability of propulsors to direct thrust over a wider arc, even into its own hull. In this study, we examine the interactions between a pair of thrust...
Conference Paper
A hydrodynamic digital twin of vessel can be used to replicate the behaviour and response of the vessel in a virtual environment. In this paper, a real-time simulation model (RTSM) for an azimuth stern-drive (ASD) tug has been developed for simulating the hydrodynamic performance of the vessel under a range of environmental conditions. Based on the...
Article
Full-text available
The ASD tug is considered the modern habour tug due to its versatility in performing a wide variety of tugging/towing operations. With the advent of autonomous systems and desire to improve operations, there are benefits to automating the tug operations. Under different operating environments, there could be uncertainties in the model and the distu...
Conference Paper
Maritime autonomous surface ships (MASS) require accurate future state projection to initiate collision-avoidance manoeuvres. Forecasts of the vessels’ trajectories and motions are fundamentally based on the mathematical manoeuvring model, which is an essential component of their hydrodynamic digital twin nowadays. Using the benchmark container shi...
Conference Paper
Autonomous tugs may play an important role in future ports, due to the shortage of qualified mariners. A digital twin (mathematical model incorporating a vessel’s hydrodynamic behavior and response, suitable for real-time control) would be needed for autonomous operations. Yet, partly because tugs are generally high-powered and very maneuverable co...
Conference Paper
The development of an accurate digital performance twin of a tug requires a complete understanding of its propulsive capacity and hull-thruster interactions. In this study, the propulsion characteristics of an Azimuth Stern Drive (ASD) tug is investigated using model-scale Reynolds-averaged Navier-Stokes (RANS) simulations. The propulsion plant con...
Chapter
Full-text available
The development of supercomputing technologies has enabled a shift towards high-fidelity simulations that is used to complement physical modelling. At the Technology Centre for Offshore and Marine, Singapore (TCOMS), such simulations are used for high-resolution investigations into particular aspects of fluid-structure interactions in order to bett...
Article
Full-text available
This paper presents a CFD URANS approach to model self-propelled free running maneouvres for autonomous or remote-controlled surface vessels in calm water and Stokes waves. The object of study in this paper is a benchmark container ship KCS. A hierarchy of overset grids are utilised, allowing active rudder motions while the vessel is undertaking 6...
Article
Full-text available
This paper is a first attempt to develop real-time methods to accurately and reliably simulate vessel manoeuvring in waves. In this paper, hydrodynamic coefficients for the benchmark KCS hull are estimated using URANS-CFD generated manoeuvres in regular waves. Added resistances are derived from a potential-flow based solver over a range of incidenc...
Preprint
Experiments investigating the attenuation and dispersion of surface waves in a variety of ice covers are performed using a refrigerated wave flume. The ice conditions tested in the experiments cover naturally occurring combinations of continuous, fragmented, pancake and grease ice. Attenuation rates are shown to be a function of ice thickness, wave...
Poster
Full-text available
Laboratory wave basin experiments are implemented to investigate wave-driven collisions and rafting between ice floes. Collision and rafting regimes are identified over a range of incident wave conditions and floe-floe separations. Five types of collision and rafting behaviours were observed. The experiments allowed identification of the dominant p...
Thesis
The wave-induced collisions and rafting of ice floes are investigated experimentally and theoretically. Results from a series of wave basin experiments are presented. Ice floes are simulated experimentally using thin plastic disks. The first round of experiments focusses on measuring the oscillatory surge, heave, pitch and drift motions of solitary...
Poster
Full-text available
Wave-induced collisions and rafting of ice floes (discrete pieces of sea ice) are important processes affecting the dynamics and thermodynamics of the ice cover. Collisions erode floes, and influence the large-scale deformation of the ice cover. Rafting (one floe being forced on top of another by out of plane collisions) is a major contributor to t...
Presentation
Full-text available
A theoretical/numerical model is developed to simulate collisions between two ice floes, due to a plane incident wave forcing. It predicts the frequency and impact velocities of the collisions given the properties of the floes and the amplitude and period of the incident wave. It uses slope-sliding theory to model the motion of the floes in respons...
Presentation
Full-text available
The relationship between sea ice and our global climate system is highly complex and dynamic. The distribution and concentration of sea ice has been shown to affect large-scale oceanic and atmospheric processes. In order to improve our understanding of the current conditions in the Arctic and Antarctic, and predict future changes to the sea-ice cov...
Conference Paper
Full-text available
An experimental model of wave-induced collisions between two sea-ice floes is presented. The model was implemented in a laboratory wave basin. Monochromatic incident waves were used, with frequencies between 0.5 Hz and 1.5 Hz, and wave heights 20 mm and 40 mm. An algorithm is proposed to identify collisions and collision velocities from recorded fl...
Presentation
Full-text available
Sea-ice has an important and intricate relationship with the climate feedback system. Its distribution and concentration have been shown to affect large-scale marine and atmospheric processes. In order to better understand the current conditions in the Arctic and Antarctic regions, and predict future changes to the sea-ice cover, it is important to...
Article
Full-text available
A theoretical model and an experimental model of surge motions of an ice floe due to regular waves are presented. The theoretical model is a modified version of Morrison's equation, valid for small floating bodies. The experimental model is implemented in a wave basin at scale 1:100, using a thin plastic disk to model the floe. The processed experi...

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Projects

Projects (2)
Project
To understand fluid flow and parameterise wave energy dissipation within the ice-water boundary layer.