Oil-water two-phase flow in 0.0254 m horizontal pipe is simulated using FLUENT 6.2. The stratified flow regime is modeled using Volume of Fluid (VOF) with turbulent model RNG k-ε. Grid independent study has been conducted to decide mesh size for solution accuracy and optimum computational cost. The simulation is performed in time-dependent simulation where oil and water are initially separated by patching the region base on difference in density. Observation on the effect of velocity to the pressure gradient was also simulated. Flow velocity at 0.2, 0.5, 0.8 and 1.1 m/s with same volume fraction for each phase with appropriate multiphase model and turbulence model are presented.
For Malaysia, ocean energy can be the best resource of green marine renewable energy, because the generation of the electricity by burning of fossil fuels produces undesired greenhouse gases, moreover the reserves of fossil fuels are being depleted and there is no accurate way to determine how much remains. Turbines using hydraulic drive are being used for generating electricity by some manufacturers in the wind industry as an alternative to gearbox drive-trains because of reliability issues. Likewise in marine renewable sector hydraulic-drive is an attractive option in terms of improved system efficiency, reliability and robustness. This paper presents a time domain simulationof hydraulic transmissions forLow Speed Vertical Axis Marine Current Turbines using Simulink software. These turbines are applied to harness marine current energy because of their relative simplicity and represent a promising technology to exploit low speed currents due to their small plants with reduced installation and maintenance costs.
Mega-floats are designed for offshore exploration and as floating cities for human habitation. Therefore, livability items are one of the most important design factors such as recreation area, environment system, safety and etc. Many design concepts have been proposed, but the inclusion of livability – related components is not well explained. Livability criteria have not been defined. Basic descriptions and design specifications have not been provided either. The paper proposes an approach for systematic incorporation of livability items into mega-float design concepts. Based on a selected set of livability criteria a list of livability items for the mega-float has been drawn. Area requirement for each livability items has been systematically estimated based on a set of benchmark values. Gross and individual area requirement for livability item on each of the mega-float modules could be estimated. Generic expressions have been proposed and could be applied for non- modular type mega-float design concepts.
Developments of offshore pipeline projects in Malaysia waters are showing general trend towards deeper water, such as KIKEH in 2200 meter water depth. As the exploration is getting into deeper water or crossing a deep water section. The different design issues may become governing compared to shallow water. Several number of issues are needed to be taken onto account in the design of pipelines in deep water such as aspect related to high external pressure, limitation for installation and geo-hazards are addressed. In order to give an early insight for designer to measure the reliability for a deep water project to current technology capabilities, a simulation program is required to achieve the objective.
Application of Quasi-Continuous Vortex Lattice Method (QCVLM) was widely used to predict the performance of propeller in open water and behind the hull of ships. In other hand, the application the QCVLM in aeronautics is less than in marine. This paper reviews on application of quasi continuous vortex lattice method for determining the performance of helicopter tail rotor propeller. Tail rotor blade for Bell B206 of one seat helicopter is used. The prototype helicopter was manufactured in the Aeronautics Laboratory, Universiti Teknologi Malaysia.
