Browsing NTNU Open by Author "Ong, Muk Chen"
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A rational approach to seepage flow effects on bottom friction beneath random waves
Myrhaug, Dag; Holmedal, Lars Erik; Ong, Muk Chen (Journal article, 2014)The bottom friction beneath random waves is predicted taking into account the effect of seepage flow. This is achieved by using wave friction factors for rough turbulent, smooth turbulent and laminar flow valid for regular ... -
Applications of a Standard HighReynolds Number k-εModeland a Stochastic Scour PredictionModel for Marine Structures
Ong, Muk Chen (Doktoravhandlinger ved NTNU, 1503-8181; 2009:71, Doctoral thesis, 2009) -
Assessment of performance enhancement of a semi-submersible vertical axis wind turbine with an optimized Darrieus rotor
Cheng, Zhengshun; Wang, Kai; Ong, Muk Chen (Journal article; Peer reviewed, 2018)Increasing efforts are currently being devoted to develop floating vertical axis wind turbines (VAWTs), due to their potential to reduce the cost-of-energy. Optimization of rotors is favorable to increase the power capture ... -
Assessment of shallow water random wave-induced scour at the trunk section of breakwaters using deep water wind and wave conditions
Myrhaug, Dag; Ong, Muk Chen (Peer reviewed; Journal article, 2020)This article provides a simple analytical method giving estimates of random wave-induced scour at the trunk section of vertical-wall and rubble-mound breakwaters in shallow water from deep water wind and wave conditions. ... -
Dynamic responses of a jacket-type offshore wind turbine using decoupled and coupled models
Ong, Muk Chen; Bachynski, Erin Elizabeth; Økland, Ole David; Passano, Elizabeth Anne (Chapter, 2014)This paper presents numerical studies of the dynamic responses of a jacket-type offshore wind turbine using both decoupled and coupled models. In the decoupled (hydroelastic) model, the wind load is included through ... -
Effects of soil profile variation and scour on structural response of an offshore monopile wind turbine
Li, Hui; Ong, Muk Chen; Leira, Bernt Johan; Myrhaug, Dag (Journal article, 2018)This paper presents an engineering approach to study the effects of soil profile variation and scour on structural response of an offshore monopile wind turbine. A wind-wave model for finite water depth is proposed to ... -
Large Eddy Simulations of flow around a circular cylinder close to a flat seabed
Abrahamsen-Prsic, Mia; Ong, Muk Chen; Pettersen, Bjørnar; Myrhaug, Dag (Journal article, 2016)Large Eddy Simulations (LES) with Smagorinsky subgrid scale model are used to study the turbulent flow and wake dynamics behind a circular cylinder close to a horizontal, plane wall at subcritical Reynolds number. The focus ... -
Large Eddy Simulations of Flow around a Circular Cylinder in the Vicinity of a Wall at Reynold Number of 13100
Abrahamsen-Prsic, Mia; Ong, Muk Chen; Pettersen, Bjørnar; Myrhaug, Dag (Chapter, 2013)The flow around a circular cylinder in the vicinity of a rigid wall at Reynolds number 13100 is simulated using Large Eddy Simulations (LES) with Smagorinsky subgrid scale model. The main purpose of the present work is to ... -
Large Eddy Simulations of flow around a smooth circular cylinder in a uniform current in the subcritical flow regime
Abrahamsen-Prsic, Mia; Ong, Muk Chen; Pettersen, Bjørnar; Myrhaug, Dag (Journal article; Peer reviewed, 2014)Three-dimensional flow around a circular cylinder in a steady, uniform current at subcritical Reynolds numbers (Re) is investigated. The flow is simulated using Large Eddy Simulations (LES) with Smagorinsky subgrid scale ... -
Large Eddy simulations of flow around tandem circular cylinders in the vicinity of a plane wall
Abrahamsen-Prsic, Mia; Ong, Muk Chen; Pettersen, Bjørnar; Myrhaug, Dag (Journal article; Peer reviewed, 2018)To investigate the three-dimensional flow around free-spanning, tandem marine pipelines, Large Eddy Simulations (LES) with Smagorinsky subgrid scale model are performed using the open-source code OpenFOAM. Two circular ... -
Large Eddy Simulations of Flow Around Tandem Cylinders Close to a Horizontal Wall
Abrahamsen-Prsic, Mia; Ong, Muk Chen; Pettersen, Bjørnar; Myrhaug, Dag (Journal article; Peer reviewed, 2015)This study focuses on the numerical simulations of the flow around tandem cylinders placed in the vicinity of a rigid, horizontal plane wall. The cylinders are immersed close to a plane wall in a steady current with a ... -
Large Eddy Simulations of flow around two circular cylinders in tandem in the vicinity of a plane wall at small gap ratios
Li, Zhong; Abrahamsen-Prsic, Mia; Ong, Muk Chen; Khoo, Boo Cheong (Journal article; Peer reviewed, 2018)Large Eddy Simulations (LES) with Smagorinsky subgrid scale model have been performed for the flow past two circular cylinders in tandem placed in the vicinity of a horizontal plane wall at very small gap ratios, namely ... -
Large Eddy Simulations of Flow Past Two Pipelines in Tandem in Close Proximity to the Seabed
li, zhong; Abrahamsen-Prsic, Mia; Ong, Muk Chen; khoo, Boo Cheong (Chapter, 2017)Three-dimensional Large Eddy Simulations (LES) with Smagorinsky subgrid scale model have been performed for the flow past two free-spanning marine pipelines in tandem placed in the vicinity of a plane wall at a very small ... -
Large Eddy Simulations of Three-Dimensional Flow Around a Pipeline in a Uniform Current
Prsic, Mia; Ong, Muk Chen; Pettersen, Bjørnar; Myrhaug, Dag (Chapter; Peer reviewed, 2012)Three-dimensional (3D) modeling of the flow around a circular cylinder in a steady, uniform current subjected to low and intermediate Reynolds numbers (Re) is considered. Large eddy simulations (LES) are used to simulate ... -
LES of Flow Around Tandem Cylinders Close to a Horizontal Wall
Abrahamsen-Prsic, Mia; Ong, Muk Chen; Pettersen, Bjørnar; Myrhaug, Dag (Chapter, 2015)This study focuses on the numerical simulations of the flow around tandem cylinders placed in the vicinity of a rigid, horizontal, plane wall. The cylinders are immersed close to a plane wall in a steady current with a ... -
Numerical analysis of a vessel- shaped offshore fish farm
Li, Lin; Jiang, Zhiyu; Høiland, Andreas Vangdal; Ong, Muk Chen (Journal article; Peer reviewed, 2018)The aquaculture industry is aiming to move fish farms from nearshore areas to open seas because of many attractive advantages in the open water. However, one major challenge is to design the structure to withstand the ... -
Numerical Simulation of Boundary Layer Flow Around Simplified Subsea Structures
Nymo, Dennis Alexander (Master thesis, 2015)Numerical simulations of boundary layer flow over simplified subsea structures on a flat seabed have been performed. A two-dimensional RANS method with a standard high Reynolds number k-ε turbulence model have been applied. ... -
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 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, ...