Blar i Fakultet for ingeniørvitenskap (IV) på dokumenttype "Doctoral thesis"
Viser treff 1-20 av 1737
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1-D phenomenological modelling of gas-solid fluidized bed reactors for chemical looping reforming
(Doctoral theses at NTNU;2018:9, Doctoral thesis, 2018)This PhD thesis is a part of the EU FP7 Project called NanoSim. The main objective of this work is to develop a 1-D phenomenological model for fluidized bed reactors to simulate the performance of second-generation CO2 ... -
3D Cohesive Modelling of Hydrogen Embrittlement in the Heat Affected Zone of X70 Steel
(Doktoravhandlinger ved NTNU, 1503-8181; 2014:53, Doctoral thesis, 2014) -
3D Numerical Modelling of Non-Linear and Breaking Wave Forces On Offshore Wind Turbine Substructures
(Doctoral theses at NTNU;2019:66, Doctoral thesis, 2019)Offshore wind energy technology has experienced a remarkable growth in the last few decades due to an increasing focus towards renewable energy research. The objective of the research towards offshore wind energy is to ... -
A 7-field Lagrangian slug capturing and slug tracking model with higher order methods
(Doctoral theses at NTNU;2017:246, Doctoral thesis, 2017)In this thesis, a 7-field Lagrangian slug capturing and slug tracking model with higher order methods and an adaptive grid is investigated for predicting the behaviour of two-phase gasliquid flow in multiphase flow pipelines. ... -
A bottom-fixed lattice tower for offshore wind turbines
(Doktoravhandlinger ved NTNU, 1503-8181; 2014:160, Doctoral thesis, 2014)Wind turbines have been sited away from coasts in the last decade to exploit the tremendous potential of wind energy on the vast oceans, especially in Northern Europe where there is relatively limited space on land and ... -
A Boundary Element Method Applied to Strongly Nonlinear Wave-Body Interaction Problems
(Doktoravhandlinger ved NTNU, 1503-8181; 2007:141, Doctoral thesis, 2007)A two-dimensional Boundary Element Method (BEM) based on potential flow theory is developed to study wave-body interaction problems with strongly nonlinear effects. In particular, the following problems are studied. One ... -
A classification method for scaling river biotopes for assessing hydropower regulation impacts
(Doktoravhandlinger ved NTNU, 1503-8181; 2005:140, Doctoral thesis, 2005)This thesis describes the development of a habitat assessment methodology based on theories of hydroecology for use in river basin management. The methodology includes a robust habitat classification system and provides ... -
A comprehensive scaling up technique for pneumatic transport systems
(Doktoravhandlinger ved NTNU, 1503-8181; 2005:169, Doctoral thesis, 2005)The main objective of this investigation was to formulate a comprehensive scaling up technique for designing of pneumatic conveying systems by addressing the whole pipeline together with all accessories. Five different ... -
A Computational Study of Surface to Bed Heat Transfer and Reactive Flows in Gas Fluidized Beds
(Doktoravhandlinger ved NTNU, 1503-8181; 2010:108, Doctoral thesis, 2010)This thesis presents the study of surface to bed heat transfer and reactive flows in dense phase gas-fluidized beds. The bulk of the thesis comprises of computational studies although some experimental work is also done ... -
A contribution to reliability assessment of safety-instrumented systems
(Doktoravhandlinger ved NTNU, 1503-8181; 2013:254, Doctoral thesis, 2013)Safety-instrumented systems (SISs) are among the most important and effective safety barriers in reducing the likelihood of hazardous events and/or mitigate their consequences to assets (humans, environment, and material ... -
A contribution to reliability qualification of new technical equipment: – with focus on subsea production equipment
(Doktoravhandlinger ved NTNU, 1503-8181; 2013:334, Doctoral thesis, 2013)This PhD thesis proposes new frameworks and methods which give new insights to qualification and reliability assessments of new subsea systems. The subsea oil and gas industry is an industry with strict requirements to the ... -
A cooperative information system framework to support process management
(Doktoravhandlinger ved NTNU, 1503-8181; 122, Doctoral thesis, 2002)The implementation of process orientation at Aker Verdal was enhanced by a cooperative information system (CIS) that supported process management with the right information, at the right time, at the right place, etc. A ... -
A Dimensional-Decomposition Approach for Stochastic Scale-Resolving Simulations of Turbulent Reacting Flows
(Doctoral theses at NTNU;2018:399, Doctoral thesis, 2018)High-fidelity and reliable numerical design tools are main keys to the development of novel gas turbines for hydrogen-rich fuels. However, state-of-the-art simulation tools for the most part only give a bulk approximation ... -
A Fatigue Assessment Methodology for Notched Components Containing Defects
(Doktoravhandlinger ved NTNU, 1503-8181; 2007:224, Doctoral thesis, 2007)A probabilistic fatigue assessment tool, P•FAT, directly applicable to the results from a standard finite element stress analysis has been developed. The fatigue assessment tool consist of two deterministic fatigue assessment ... -
A Field Study of Reduced Axial Compressor Performance Deterioration through Online Washing and Air Intake Filtration Upgrade
(Doctoral theses at NTNU;2018:300, Doctoral thesis, 2018)Background Oil and gas production at several North Sea offshore installations is limited by the gas turbine power available, and any deterioration in gas turbine performance directly affects production rates. Fouling in ... -
A foundation of road user charges
(Dr. ingeniøravhandling, 0809-103X; 2003:49, Doctoral thesis, 2003) -
A Framework for Continuous Design Reuse Management Supported by an Option-Based Reuse Approach
(Doktoravhandlinger ved NTNU, 1503-8181; 2007:139, Doctoral thesis, 2007)This PhD thesis aims to address the problem of missed design reuse opportunities across consecutive products in industry. The research specifically targets the perceived knowledge gap regarding conceptual tools for ... -
A framework for mixing-reaction closure with the Linear Eddy Model
(Doktoravhandlinger ved NTNU, 1503-8181; 2010:53, Doctoral thesis, 2010)This thesis presents a novel framework for mixing-reaction closure build on the Linear Eddy Model by Kerstein (1991B). The development of the modeling concept has been motivated by the need for better predictive tools for ... -
A framework for modeling internal mass transfer in atmospheric freeze drying
(Doktoravhandlinger ved NTNU, 1503-8181; 2011:106, Doctoral thesis, 2011)In modeling of atmospheric freeze drying (AFD), the modeling of the product is often confined to either one-dimensional models or multi-dimensional models of very basic geometries. Such models are not able to handle a ... -
A Framework for Modelling of Vendor Managed Inventory
(Doktoravhandlinger ved NTNU, 1503-8181; 2008:64, Doctoral thesis, 2008)