Browsing SINTEF Open by Author "Johansen, Stein Tore"
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14th International Conference on CFD in 6 Oil & Gas, Metallurgical and Process Industries SINTEF, Trondheim, Norway, October 12–14, 2020
Olsen, Jan Erik; Cloete, Jan Hendrik; Johansen, Stein Tore (SINTEF Proceedings;6, Book; Peer reviewed, 2020) -
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 multi-scale model for oxygen carrier selection and reactor design applied to packed bed chemical looping combustion
Tabib, Mandar; Morud, John; Johansen, Stein Tore; Amini, Shahriar (SINTEF Proceedings;1, Chapter, 2015)Proper selection of a catalyst shape (or a particle shape) can improve the performance of a gas-solid packed bed reactor. The particle shape affects the packing structure and the transport phenomena within the packed bed. ... -
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 (Peer reviewed; Journal article, 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 method, based on formal volume averaging of mass, momentum equations
Dang, Son Tung; Johansen, Stein Tore; Meese, Ernst A. (SINTEF proceedings;2387-4295, Chapter; Peer reviewed, 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 ... -
Comparison of phenomenological and fundamental modelling approaches for predicting fluidized bed reactor performance
Cloete, Schalk; Zaabout, Abdelghafour; Johansen, Stein Tore; Amini, Shahriar (Peer reviewed; Journal article, 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: 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 ... -
The effect of frictional pressure, geometry and wall friction on the modelling of a pseudo-2D bubbling fluidised bed reactor
Cloete, Schalk Willem Petrus; Johansen, Stein Tore; Zaabout, Abdelghafour; van Sint Annaland, Martin; Gallucci, Fausto; Amini, Shahriar (Peer reviewed; Journal article, 2015)The two fluid model (TFM) closed by the kinetic theory of granular flows (KTGF) has been developed to a high level of maturity over the past three decades. However, significant uncertainties still remain about the influence ... -
Evaluation of a filtered model for the simulation of large scale bubbling and turbulent fluidized beds
Cloete, Schalk; Johansen, Stein Tore; Amini, Shahriar (Peer reviewed; Journal article, 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 ... -
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 (Peer reviewed; Journal article, 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 ... -
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 (Peer reviewed; Journal article, 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 ... -
The generality of the standard 2D TFM approach in predicting bubbling fluidized bed hydrodynamics
Cloete, Schalk Willem Petrus; Zaabout, Abdelghafour; Johansen, Stein Tore; Annaland, MV; Gallucci, F; Amini, Shahriar (Peer reviewed; Journal article, 2013)Hydrodynamic simulations of a pseudo-2D bubbling fluidized bed were carried out and compared to experiments conducted over a wide range of flow conditions. The primary purpose of this study was to assess the generality of ... -
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 (Peer reviewed; Journal article, 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 (Peer reviewed; Journal article, 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 ... -
Hybrid and cognitive digital twins for the process industry
Johansen, Stein Tore; Unal, Perin; Albayrak, Özlem; Ikonen, Enso; Linnestad, Kasper J.; Jawahery, Sudi; Srivastava, Akhilesh; Løvfall, Bjørn Tore (Peer reviewed; Journal article, 2023)In a Europe that is undergoing digital transformation, the COGNITWIN project is contributing to accelerate the transformation and introduce Industry 4.0 to the European process industries. The opportunities here can be ... -
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 (Peer reviewed; Journal article, 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 ... -
Modeling Water Droplet Freezing and Collision with a Solid Surface
Shayunusov, Doston; Eskin, Dmitry; Balakin, Boris; Chugunov, Svyatoslav; Johansen, Stein Tore; Akhatov, Iskander (Peer reviewed; Journal article, 2021)Water droplets released from the sea surface represent one of the major causes of ice accretion on marine vessels. A one-dimensional model of the freezing of a spherical water droplet moving in cold air was developed. The ... -
Modelling of dispersed oil/water flow in a near-horizontal pipe
Kjølaas, Jørn; Schümann, Heiner; Gonzalez Rengifo, Diana Carolina; Johansen, Stein Tore (Peer reviewed; Journal article, 2022)A gravity-diffusion model was implemented for predicting water concentration profiles in dispersed oil-continuous oil–water flows. In this model, the measured droplet size distributions were used instead of a droplet size ... -
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 (SINTEF proceedings;2387-4295, 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 ... -
Numerical approach for generic three‐phase flow based on cut‐cell and ghost fluid methods
Dang, Son Tung; Meese, Ernst A.; Morud, John; Johansen, Stein Tore (Journal article; Peer reviewed, 2019)In this paper, we introduce numerical methods that can simulate complex multiphase flows. The finite volume method, applying Cartesian cut‐cell is used in the computational domain, containing fluid and solid, to conserve ...