Blar i NTNU Open på tittel
Viser treff 65003-65022 av 100934
-
Numerical Study of Hydrogen Inhibition of Char
(Master thesis, 2015)It has been known for a long time that hydrogen in the gas phase tend to inhibit gasification of char at low and intermediate temperatures. At higher temperatures, however, there are indications that hydrogen may speed up ... -
Numerical Study of Hydrogen Inhibition of Char Gasification Using Detailed Hetero- and Homogeneous Chemical Kinetics
(Journal article; Peer reviewed, 2016)It has been known for a long time that hydrogen in the gas phase tends to inhibit gasification of char at low and intermediate temperatures. At higher temperatures, however, there are indications that hydrogen may speed ... -
Numerical study of ice-induced loads and responses of a monopile-type offshore wind turbine in parked and operating conditions
(Journal article; Peer reviewed, 2016)Offshore wind is an attractive source of renewable energy. In regions with cold climates, such as Canada, the Baltic Sea, and Bohai Bay, a good understanding of ice loads is essential to design a reliable and cost effective ... -
Numerical study of irregular breaking wave forces on a monopile for offshore wind turbines
(Journal article; Peer reviewed, 2016)Offshore wind turbine substructures consisting of cylindrical members are exposed to highly non-linear and breaking waves in shallow waters [1]. Those structures experience extreme impulsive loads of short duration from ... -
Numerical Study of Mass Transfer Limitations in a Bioreactor Operated in the Heterogeneous Flow Regime
(Master thesis, 2017)With the increased focus on detaining a more environmental friendly industry, biological processes have been given more attention over the last years. Such a biological process is single cell protein (SCP) production, ... -
Numerical Study of Nonlinear Effects for the Wave-Induced Drift Loads on an FPSO
(Master thesis, 2020)Hovedmålet med denne oppgaven var å undersøke viktigheten av ikke-lineære interaksjonseffekter mellom bølger og skip for driftskreftene på en FPSO i bølger i tre dimensjoner, med fokus på de midlere driftkreftene. Denne ... -
Numerical Study of Parametric Roll on a Fishing Vessel
(Chapter; Peer reviewed, 2013)Present research activity examines numerically the occurrence of parametric roll on a fishing vessel interacting with regular head-sea waves. The adopted solver is an efficient 3-D numerical Domain-Decomposition strategy ... -
Numerical study of particle settlement in a sand trap with multiple flow calming structures
(Master thesis, 2023)Et tradisjonelt sandfang i et vannkraftverk reduserer strømningshastigheten slik at sedimenter som transporteres kan skilles ut fra vannet. For å minimere turbinerosjon forårsaket av partikler er det nødvendig å optimere ... -
Numerical Study of Potential and Viscous, Nonlinear, Effects for Wave Drift Loads on Offshore Structures
(Master thesis, 2022)Flytende offshore konstruksjoner utsatt for miljøbelastninger er ofte forankret for å kontrollere posisjonen til konstruksjonen. Forankringen må ta høyde for bølgelaster, da spesielt bølgedriftsbelastninger, før konstruksjonen ... -
Numerical Study of Radiation Hazard from Advanced Flare Systems at Process Plants
(Master thesis, 2016)This thesis investigates how to optimize the calculation of thermal radiation from an advanced flare system in the numerical computation tool Kameleon FireEx (KFX). Measured radiation levels from a real flaring scenario ... -
Numerical Study of Seabed Boundary Layer Flow around Monopile and Gravity-based Wind Turbine Foundations
(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 ... -
A numerical study of separation and stagnation points for steady and unsteady flow over an elliptic cylinder near a moving wall
(Peer reviewed; Journal article, 2021)Flow separation around an elliptic cylinder with an aspect ratio of 0.4 near a moving wall is investigated numerically for Re 2 ½5; 150 with G=D 2 ½0:1; 2 (where G denotes the distance between the cylinder bottom and the ... -
Numerical Study of Soil Nailing Technique - Empirical, classical limit equilibrium and 2D-3D FEM applications
(Master thesis, 2016)Literature review was conducted on the state-of-the art and the state-of-the practice of the soil nailing technique. The literature review focused on design analysis and constructional aspects of the soil nailing technique ... -
Numerical study of surface waves on a shear current - Waves behind a surface obstacle
(Master thesis, 2018)This master's thesis has made investigation into waves and currents interaction numerically by the use of an oscillating cylinder as a wave-maker. Three cases were investigated: still water, uniform flow and linear shear ... -
Numerical study of the droplet-interface dynamic related to liquid-liquid separators
(Master thesis, 2013)The CFD package OpenFoam with the VOF approach of the interFoam solver is used to simulate water drops in Exxsol D80 oil, with diameter ranging from 100 micrometer to 1000 micrometer. Parasitic currents are caused by the ... -
Numerical study of the effect of cement defects on flexural-wave logging
(Journal article; Peer reviewed, 2019)Cement-bond evaluation is needed for new wells and plug and abandonment activities. The ultrasonic leaky Lamb-wave (also called the flexural-wave) technique, in combination with the pulse-echo technique, has been widely ... -
A Numerical Study of the Hydrodynamics of an Offshore Fish Farm Using REEF3D
(Chapter, 2021)In this paper, the CFD framework REEF3D is utilized to investigate the hydrodynamics of a large offshore fish farm in waves. The solver consists of a rigid body dynamics solver for the frame structure coupled to a fluid ... -
Numerical Study of the Interaction between Level Ice and Wind Turbine Tower for Estimation of Ice Crushing Loads on Structure
(Journal article; Peer reviewed, 2019)In this paper, the interaction between level ice and wind turbine tower is simulated by the explicit nonlinear code LS-DYNA. The isotropic elasto-plastic material model is used for the level ice, in which ice crushing ... -
Numerical Study of the Interaction of Flow over Two Airfoils in Relative Motion
(Master thesis, 2011)Computational fluid dynamics (CFD) was be used to investigate aspects of interaction of flow over two airfoils in relatie motion in detail.%Problem statement2D tandem airfoil setups were studied, where the leading airfoil ... -
Numerical study of unsteady flow in slits and investigation of methods to reduce pressure pulsations in pipes
(Master thesis, 2020)Noe av vannet som strømmer gjennom en Francis turbin lekker opp over løpehjulet mot øvre lokk. Dette vannet evakueres gjennom små spalter i lokket, og ledes videre gjennom et rørsystem til et kjølevannsbasseng. Virvelavløsninger ...