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Numerical investigation of an oil-free liquid-injected screw compressor with ammonia-water as refrigerant for high temperature heat pump applications
(Peer reviewed; Journal article, 2022)This study investigates a numerical model of an oil-free twin screw compressor with an ammonia-water mixture as refrigerant and liquid injection. The compressor was identified as the main constraint to increase the heat ... -
Numerical investigation of blade roughness impact on the aerodynamic performance and wake behavior of horizontal axis wind turbine
(Peer reviewed; Journal article, 2023)This research focuses on the effect of leading-edge erosion on the performance of wind turbines, specifically the GE1.5XLE horizontal axis wind turbine. The blade element momentum (BEM) method is used to predict the ... -
Numerical investigation of collapse and ductile fracture in X65 offshore pipelines subject to external pressure, bending and axial loads
(Master thesis, 2016)An offshore pipeline during S-laying in deep water may be subject to high pressure, bending and tensile loads. In the event of loss of tension the pipe may buckle for sufficiently high external pressures and bending moments. ... -
Numerical investigation of favorable injection strategies in a dual-fuel CI engine for an ammonia- and diesel-based fuel
(Master thesis, 2022)Etter hvert som bevisstheten rundt menneskeskapte klimaendringer har vokst, har søken etter rene teknologier blitt et hett tema. Gjennom avtaler som Parisavtalen har mange land forpliktet seg til å redusere sine klimagassutslipp ... -
NUMERICAL INVESTIGATION OF FLOW AROUND INTERSECTING CYLINDERS
(Master thesis, 2016)Recent years interfering effects in the wake of bluff body are drawing more attention, especially for the intersecting cylinders. The structures with the similar shape of the intersecting cylinder are used in many industrial ... -
Numerical investigation of flow around intersecting cylinders as part of a net structure
(Master thesis, 2017)Interference effects occurs in the wake of cylindrical bodies. In marine fishery and aquaculture industry, circular cylinder is very common in offshore fish farm. The cage, as a knot structure, is consist of intersecting ... -
Numerical Investigation of Flow Around Rectangular Cylinders at Low Reynolds Numbers
(Master thesis, 2015)The study of flow around bluff bodies such as rectangular and circular cylinders is of direct relevance to several practical applications in the marine industry. The flow past bluff bodies involves several fluid phenomena, ... -
Numerical investigation of flow around straight cylinders with inclination
(Master thesis, 2016)In this master thesis the validity of the independence principle(I.P) on an inclined infinite circular cylinder has been investigated. Normalized Reynolds numbers 150 and 1000 for inclination angles 0°-65° were studied. ... -
Numerical Investigation of Flow Field subject to Vibrating Structure
(Master thesis, 2017)Hydraulic turbines are more often than before running at off-design conditions. The flow conditions outside the best efficiency point may increase the mechanical load, and hence fatigue, on the turbine blades. The flow-induced ... -
Numerical Investigation of Fluid-Ice-Structure Interaction During Collision by an Arbitrary Lagrangian Eulerian Method
(Chapter; Peer reviewed, 2016)When ice floes collide against marine structures, pronounced hydrodynamic loads are induced by the water-ice-structure interaction. With today’s highly competitive structural design market, it is nearly impossible to ignore ... -
Numerical Investigation of Focused Waves and their Interaction with a Vertical Cylinder using REEF3D
(Journal article; Peer reviewed, 2017)For the stability of offshore structures, such as offshore wind foundations, extreme wave conditions need to be taken into account. Waves from extreme events are critical from the design perspective. In a numerical wave ... -
Numerical Investigation of Free Surface Flows
(Master thesis, 2014)The Star-CCM+ simulation software has been used to model a number of benchmark free surface flow cases, including the two dimensional submerged NACA 0012 foil, the surface piercing NACA 0024 foil, and the well investigated ... -
Numerical investigation of free-stream turbulence effects on the transition-in-wake state of flow past a circular cylinder
(Journal article; Peer reviewed, 2018)We investigate how a turbulent free-stream (TFS) affects the transition-in-wake state of flow past a cylinder. Direct numerical simulations of a decaying TFS flow past a cylinder have been performed, where the intensity ... -
Numerical investigation of glycerol/diesel emulsion combustion in compression ignition conditions using Stochastic Reactor Model
(Peer reviewed; Journal article, 2022)In this work, we numerically investigate the potential of glycerol as a diesel fuel additive to reduce soot emissions. Many different fuel additives offer environmental benefits, since there is a surplus supply of glycerol ... -
Numerical investigation of heat transfer in a CO2 two-phase ejector
(Journal article; Peer reviewed, 2018)In this paper, the influence of heat transfer in the walls of an R744 two-phase ejector on ejector performance was investigated. A numerical investigation was performed using a computational fluid dynamic (CFD) model of ... -
Numerical Investigation of Irregular Breaking Waves for Extreme Wave Spectra Using CFD
(Chapter, 2017)Offshore structures are exposed to irregular sea states. It consists of breaking and non-breaking waves. They experience breaking wave loads perpetually after being installed in the open ocean. Thus, the study of wave ... -
Numerical investigation of lean premixed ammonia/hydrogen/nitrogen-air flame at blow-out
(Master thesis, 2023)I denne avhandlingen gjennomføres en studie av turbulent flammer ved utblåsning ved hjelp av Large-Eddy Simulation (LES) i en bluff-body brenner. Avhandlingen har som mål å vurdere OpenFOAMs løser for turbulent reaktiv ... -
Numerical investigation of modeling frameworks and geometric approximations on NREL 5 MW wind turbine
(Journal article; Peer reviewed, 2018)The key to the better design of an industrial scale wind turbine is to understand the influence of blade geometry and its dynamics on the complicated flow-structures. An industrial-scale wind turbine can be numerically ... -
Numerical Investigation of Natural Convection of Oil Flow in Transformer
(Master thesis, 2020)Effekttapet, samt gjentatte kaldstart av en elektrisk transformator kan føre til at tem- peraturen i transformatoren blir så høy at levetiden reduseres. For å minke denne tem- peraturøkningen brukes tranformatorolje som ... -
Numerical investigation of oscillatory flow around a step cylinder
(Master thesis, 2022)The structures with a similar shape to the step cylinder, which consists of one small-diameter cylinder at the top and a coaxial large-diameter cylinder in the middle, are widely used in marine engineering applications. A ...