Browsing NTNU Open by Author "Ong, Muk Chen"
Now showing items 21-37 of 37
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Numerical Simulation of Flow Around Remotely Operated Vehicle (ROV)
Skorpa, Steinar (Master thesis, 2012)Computational Fluid Dynamics (CFD) have been applied for numerical simulations of the flow around simplified shapes of a Remotely Operated Vehicle (ROV). The simulations have been carried out at Re = 850 000, which coincides ... -
Numerical Simulation of Free-Surface Waves past Two Semi-Submerged Horizontal Circular Cylinders in Tandem
Ong, Muk Chen; Kamath, Arun; Bihs, Hans; Afzal, Mohammad Saud (Journal article; Peer reviewed, 2017)Two-dimensional (2D) numerical simulations are performed to investigate free surface waves past two semi-submerged horizontal circular cylinders in tandem. The 2D simulations are carried out by solving the Unsteady ... -
Numerical simulation of piggyback pipelaying under current loadings
Lee, Chern Fong; Ji, Guomin; Janocha, Marek Jan; Ong, Muk Chen; Borsheim, Andreas (Peer reviewed; Journal article, 2023)For piggyback pipelaying operations, current-induced force and its effect on the piggyback pipe have not been thoroughly studied. In the present study, an improved method in hydrodynamic load calculation and structural ... -
Numerical simulations of the flow around single and tandem circular cylinders close to a plane wall
Prsic, Mia Abrahamsen (Doctoral thesis at NTNU;2016:43, Doctoral thesis, 2016)In order to model the turbulent flow around cylindrical structures in various configurations, Large Eddy Simulations (LES) are used in the present work. LES utilize a highly accurate model at reasonable time-consumption, ... -
Numerical Study of Seabed Boundary Layer Flow around Monopile and Gravity-based Wind Turbine Foundations
Trygsland, Eirik (Master thesis, 2015)Computational fluid dynamics (CFD) has been used to study the boundary layer flow around three different bottom-fixed offshore wind turbine foundation designs. Two of the designs are gravity-based foundations, where one ... -
Numerical study on the heading misalignment and current velocity reduction of a vessel-shaped offshore fish farm
Li, Lin; Jiang, Zhiyu; Wang, Jungao; Ong, Muk Chen (Peer reviewed; Journal article, 2019)Recently, the concept of a vessel-shaped fish farm was proposed for open sea applications. The fish farm comprises a vessel-shaped floater, five fish cages, and a single-point mooring system. Such a system weathervanes, ... -
Power performance and dynamic responses of a combined floating vertical axis wind turbine and wave energy converter concept
Cheng, Zhengshun; Wen, Ting-Rui; Ong, Muk Chen; Wang, Kai (Journal article; Peer reviewed, 2019)Currently, the development of floating wind turbines and wave energy converters (WECs) is both facing the challenge of high cost-of-energy (CoE). A promising way to reduce the CoE is to employ combined wind and wave energy ... -
Predicting the Heading Misalignment of a Vessel-Shaped Offshore Fish Farm Under Waves and Currents
Li, Lin; Jiang, Zhiyu; Wang, Jungao; Ong, Muk Chen (Chapter, 2018)A vessel-shaped fish farm concept for open sea applications has been proposed recently. The whole system consists of a vessel-shaped floater, fish cages positioned longitudinally along the floater, and a single-point mooring ... -
Random Wave-Induced Burial and Scour of Short Cylinders and Truncated Cones on Mild Slopes
Myrhaug, Dag; Ong, Muk Chen (Chapter; Peer reviewed, 2017)A stochastic approach calculating the random wave-induced burial and scour depth of short cylinders and truncated cones on mild slopes is provided. It assumes the waves to be a stationary narrow-band random process and a ... -
Scour and Burial of Spherical Bodies, Short Cylinders, and Truncated Cones Induced by Bichromatic and Bidirectional Waves
Myrhaug, Dag; Ong, Muk Chen; Holmedal, Lars Erik (Peer reviewed; Journal article, 2024) -
Scour below pipelines due to random waves alone and random waves plus currents on mild slopes
Myrhaug, Dag; Fu, Ping; Ong, Muk Chen (Journal article, 2017)This paper provides a practical stochastic method by which the maximum equilibrium scour depth below a pipeline exposed to random waves plus a current on mild slopes can be derived. The approach is based on assuming the ... -
Seepage effects on bedload sediment transport rate by random waves
Myrhaug, Dag; Holmedal, Lars Erik; Ong, Muk Chen (Journal article, 2014)The mean net bedload sediment transport rate beneath random waves is predicted taking into account the effect of seepage flow. This is achieved by using wave half-cycle bedload sediment transport formulas valid for regular ... -
Spar-type vertical-axis wind turbines in moderate water depth: A feasibility study
Wen, Ting-Rui; Wang, Kai; Cheng, Zhengshun; Ong, Muk Chen (Journal article; Peer reviewed, 2018)The applications of floating vertical-axis wind turbines (VAWTs) in deep water have been proposed and studied by several researchers recently. However, the feasibility of deploying a floating VAWT at a moderate water depth ... -
Suspended sediments due to random waves including effects of second order wave asymmetry and boundary layer streaming
Myrhaug, Dag; Ong, Muk Chen; Holmedal, Lars Erik (Journal article, 2015)The paper provides a practical stochastic method by which the suspended sediment concentration due to long-crested (2D) and short-crested (3D) nonlinear random waves can be calculated. The approach is based on assuming the ... -
Time scale for scour beneath pipelines due to long-crested and short-crested nonlinear random waves plus current
Myrhaug, Dag; Ong, Muk Chen (Journal article; Peer reviewed, 2021)This article derives the time scale of pipeline scour caused by 2D (long-crested) and 3D (short-crested) nonlinear irregular waves and current for wave-dominant flow. The motivation is to provide a simple engineering tool ... -
Unsteady RANS Simulation of Flow around Rectangular Cylinders with different Aspect Ratios at High Reynolds Number
Dahl, Sindre Misund (Master thesis, 2014)Computational Fluid Dynamics (CFD) has been used to evaluate essential hydrodynamic quantities and flow structures around rectangular cylinders with different chord length to depth ratios (aspect ratios) at high Reynolds ... -
Wake structures and vortex-induced forces of a controlled in-line vibrating circular cylinder
Huang, Zhiyong; Ong, Muk Chen; Larsen, Carl Martin (Peer reviewed; Journal article, 2019)A two-dimensional numerical study was performed to investigate wake structures and fluid forces on a circular cylinder with prescribed vibrations in the in-line direction. Reynolds number was fixed at 500, and the SST k-w ...