Browsing NTNU Open by Author "Johansen, Stein Tore"
Now showing items 1-20 of 38
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A 2D sediment bed morphodynamics model for turbulent, non-Newtonian, particle-loaded flows
Busch, Alexander; Khatibi, Milad; Johansen, Stein Tore; Time, Rune Wiggo (Chapter, 2017)In petroleum drilling, cuttings transport problems, i.e. an accumulation of drilled of solids in the wellbore, are a major contributor to well downtime and have therefore been extensively researched over the years, both ... -
A cartesian cut-cell method, based on formal volume averaging of mass, momentum equations
Dang, Son Tung; Johansen, Stein Tore; Meese, Ernst A. (Chapter, 2017)Simulation of multiphase flows are generally treated by various classes of Eulerian methods, Lagrangian methods and various combinations of these. In the SIMCOFLOW initiative we have set out to develop a framework for ... -
A CFD-model of the Fluid Flow in a Hydrogen Peroxide Monopropellant Rocket Engine in ANSYS Fluent 16.2
Vestnes, Frida (Master thesis, 2016)The use of hydrazine in monopropellant thrusters has dominated the market for several decades. Due to the toxic nature of hydrazine, the interest in developing thrusters based on green propellants has increased. A common ... -
A multiscale numerical approach of the dripping slag in the coke bed zone of a pilot scale Si-Mn furnace
Letout, Sebastien Romain; Ratvik, Arne Petter; Tangstad, Merete; Johansen, Stein Tore; Olsen, Jan Erik (Chapter, 2017)The Si-Mn alloy process production in submerged arc furnaces (SAF) is investigated. The aim of the studies currently in progress is an enhancement of the knowledge about the key reactions and the mass transport phenomenon ... -
A simulation concept for generic simulation of multi-material flow using staggered cartesian grids
Meese, Ernst A.; Johansen, Stein Tore (Chapter, 2017)Simulation of multiphase flows is generally treated by various classes of Eulerian methods, Lagrangian methods, and various combinations of these. In the SIMCOFLOW initiative, we have set out to develop a framework for ... -
A Wall-Function Approach for Direct Precipitation/Crystallization Fouling in CFD Modelling
Johnsen, Sverre Gullikstad; Johansen, Stein Tore; Wittgens, Bernd (Chapter, 2015)The main objective of this paper is to present a generic modelling framework, for the diffusive mass transport through the turbulent, reactive boundary layer of multi-component fluid mixtures that ... -
An assessment of the ability of computational fluid dynamic models to predict reactive gas-solid flows in a fluidized bed
Cloete, Schalk; Johansen, Stein Tore; Amini, Shahriar (Journal article; Peer reviewed, 2012)Fine grid, two dimensional simulations of reactive gas–solid flows occurring in a fluidized bed reactor were carried out using the Eulerian multi-fluid kinetic theory of granular flow (KTGF) approach in the commercial flow ... -
A Cartesian Cut-Cell Methodology, Applied to Large Scale Interface Dynamics and Wave Impacts Spray Formation
Dang, Son Tung (Doctoral theses at NTNU;2020:277, Doctoral thesis, 2020)The present thesis focus on developing numerical methods that can resolve various problems in computational fluid dynamics. The Cartesian cut-cell method is used to solve continuity and momentum equations. The method will ... -
Comparison of phenomenological and fundamental modelling approaches for predicting fluidized bed reactor performance
Cloete, Schalk; Zaabout, Abdelghafour; Johansen, Stein Tore; Amini, Shahriar (Journal article; Peer reviewed, 2012)Two approaches to modelling fluidized bed reactors were evaluated and compared in this work: a phenomenological 1D approach based on empirical closures and a more fundamental 2D approach based on computational fluid dynamics ... -
Cuttings Transport Modeling - Part 1: Specification of Benchmark Parameters with a Norwegian Continental Shelf Perspective
Busch, Alexander; Islam, Aminul; Martins, Dwayne Werner; Iversen, Fionn; Khatibi, Milad; Johansen, Stein Tore; Time, Rune Wiggo; Meese, Ernst A. (Journal article; Peer reviewed, 2018)In oil and gas drilling, cuttings transport related problems are a major contributor to well downtime and costs. As a result, solutions to these problems have been extensively researched over the years, both experimentally ... -
Cuttings transport: On the effect of drill pipe rotation and lateral motion on the cuttings bed
Busch, Alexander; Johansen, Stein Tore (Peer reviewed; Journal article, 2020)Drill pipe rotation is considered a relevant factor for cuttings transport and hole cleaning. However, in the term “rotation” is often used as a moniker for the combination of plain drill pipe rotation around its own axis ... -
Evaluation of a filtered model for the simulation of large scale bubbling and turbulent fluidized beds
Cloete, Schalk; Johansen, Stein Tore; Amini, Shahriar (Journal article; Peer reviewed, 2013)Full 3D flow simulations of lab and industrial scale dense fluidized beds were carried out using a filtered Eulerian-Eulerian approach. Filtered closures for interphase momentum exchange, solids stresses and additional ... -
Evaluation of a Flow Simulator for Multiphase Pipelines
Jansen, Jeppe Mathias (Master thesis, 2009)This thesis concerns the terrain slugging capabilities of LedaFlow; it is showed that LedaFlow is indeed able to simulate terrain slugging type 1 and 2 in a S-riser geometry with air and water at atmospheric conditions, ... -
Experimental Demonstration of a Novel Gas Switching Combustion Reactor for Power Production with Integrated CO2 Capture
Zaabout, Abdelghafour; Cloete, Schalk Willem Petrus; Johansen, Stein Tore; Annaland, MV; Gallucci, F; Amini, Shahriar (Journal article; Peer reviewed, 2013)This paper experimentally demonstrates the feasibility of a novel gas switching combustion (GSC) reactor as an alternative to the traditional chemical looping combustion (CLC) process for power production with integrated ... -
Free Convection Model Development for the Thermal Analysis of Cavities in Subsea Christmas Trees
Velure, Silje Kalleklev (Master thesis, 2014)A free convective heat transfer model was developed in ANSYS CFX for trapped fluid volumes located inside subsea christmas trees. Analytical and numerical solutions to the heat transfer problem were generated for a vertical ... -
Grid independence behaviour of fluidized bed reactor simulations using the Two Fluid Model: Detailed parametric study
Cloete, Schalk Willem Petrus; Johansen, Stein Tore; Amini, Shahriar (Journal article; Peer reviewed, 2016)This short communication builds on previous work on the grid independence behaviour of the Two Fluid Model in reactive bubbling fluidized bed simulations. Regarding hydrodynamic grid independence behaviour (the numerical ... -
Grid independence behaviour of fluidized bed reactor simulations using the Two Fluid Model: Effect of particle size
Cloete, Schalk Willem Petrus; Johansen, Stein Tore; Amini, Shahriar (Journal article; Peer reviewed, 2014)It is well known that particle size has a significant influence on the grid independence behaviour of fluidized bed reactor simulations carried out using the Two Fluid Model (TFM) approach. The general rule of thumb states ... -
Implementation, Demonstration and Validation of a User-Defined Wall Function for Direct Precipitation Fouling in Ansys Fluent
Johnsen, Sverre Gullikstad; Pääkkönen, Tiina; Johansen, Stein Tore; Keiski, Riitta; Wittgens, Bernd (Chapter, 2017)In a previous paper (Johnsen et al., 2015) and presentation (Johnsen et al., 2016), we developed and demonstrated a generic modelling framework for the modelling of direct precipitation fouling from multi-component fluid ... -
Implementation, Demonstration and Validation of a User-Defined Wall Function for Direct Precipitation Fouling in Ansys Fluent
Johnsen, Sverre Gullikstad; Pääkkönen, Tiina; Johansen, Stein Tore; Keiski, Riitta; Wittgens, Bernd (Chapter, 2017)In a previous paper (Johnsen et al., 2015) and presentation (Johnsen et al., 2016), we developed and demonstrated a generic modelling framework for the modelling of direct precipitation fouling from multi-component fluid ... -
Investigation into the effect of simulating a 3D cylindrical fluidized bed reactor on a 2D plane
Cloete, Schalk Willem Petrus; Johansen, Stein Tore; Amini, Shahriar (Journal article; Peer reviewed, 2013)2D planar simulations of 3D cylindrical fluidized bed reactors are routinely carried out in order to reduce computational costs. The error involved in this simplification is largely unknown, however, and this study was ...