Blar i NTNU Open på forfatter "Ertesvåg, Ivar Ståle"
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A Numerical Study of Flow Structures and Flame Shape Transition in Swirl-Stabilized Turbulent Premixed Flames Subject to Local Extinction
Tomasch, Stefanie; Swaminathan, Nedunchezhian; Spijker, Christoph; Ertesvåg, Ivar Ståle (Peer reviewed; Journal article, 2023)Large Eddy Simulations (LES) of turbulent lean-premixed flames of V and M-shape are presented. A simple algebraic closure with the ability to capture finite-rate chemistry effects is used for subgrid reaction rate modeling. ... -
Numerisk modellering av dam-spredning, varmeoverføring og brann i flytende naturgass (LNG)
Vikan, Anders Welde (Master thesis, 2009)Denne oppgaven har sett på modellering av spredning og fordamping av dammer på faste underlag bestående av kryogene væsker. En modell basert på grunt vann-ligningene har blitt utledet. Grunt vann-ligningene består av: én ... -
Numerisk modellering av varmeoverføring og brann i flytende naturgass (LNG)
Gåserud, Espen Stødle (Master thesis, 2008)Denne oppgaven tar for seg lekkasje, spredning og fordamping av flytende naturgass (LNG) på vann, uten forbrenning. Det er sett nærmere på noen av de fysiske prosessene som ligger til grunn og hvordan disse vil kunne påvike ... -
Preliminary Evaluation of the SPUNG Equation of State for Modelling the Thermodynamic Properties of CO2 - Water Mixtures
Ibrahim, Mohamed; Skaugen, Geir; Ertesvåg, Ivar Ståle (Journal article; Peer reviewed, 2012)The accuracy of the extended corresponding state equation SPUNG is preliminary evaluated for the density, and Vapor Liquid Equilibrium (VLE) calculations of the CO2 -water mixtures. The evaluation is done by comparing the ... -
Premixed hydrogen-air flames interacting with a hydrogen porous wall
Salimath, Prashant Siddlinggayya; Ertesvåg, Ivar Ståle; Gruber, Andrea (Journal article; Peer reviewed, 2018)A laminar one-dimensional hydrogen-air flame travelling and quenching towards a chemically inert permeable wall (PW) is studied. Hydrogen flows through the wall into the premixed H2-air. The S3D numerical code with detailed ... -
PVTx Modeling of CO2 Pipeline at Depressurization Conditions Using SPUNG Equation of State (EoS) with a Comparison to SRK
Ibrahim, Mohamed; Ertesvåg, Ivar Ståle (Journal article; Peer reviewed, 2014)The proper modeling of CO2 depressurization is very important for the design for safety of a pipeline. One key element of the modeling process is the thermodynamics and transport properties modeling. In this work, an ... -
Release and Spreading of Dense Gases: Turbulence modeling with Kameleon FireEx
Bærland, Tarjei (Master thesis, 2011)A dense gas released into the atmosphere will have a flow development that can be described by a large range of physical scales and quantities. An instantaneous release will slump towards the ground unaffcted by the wind, ... -
Reynolds-averaged, scale-adaptive and large-Eddy simulations of pemixed bluff-body combustion using the Eddy dissipation concept
Lysenko, Dmitry; Ertesvåg, Ivar Ståle (Journal article, 2018)A lean premixed propane/air bluff-body stabilized flame (Volvo test rig) is calculated using the Scale-Adaptive Simulation turbulence model (SAS) and Large-Eddy simulations (LES) as well as the conventional Reynolds-averaged ... -
Safety aspects of Organic Rankine Cycles (ORC) with combustible working fluid and sub-ambient condenser pressure
Dalbakken, Håkon; Ertesvåg, Ivar Ståle (Peer reviewed; Journal article, 2024)ORCs are often designed with the lower pressure limited by the ambient pressure, to avoid air leaking into the working fluid. Safely lowering this limit will be beneficial for power-production efficiency. First, cycle ... -
Scrutinizing proposed extensions to the Eddy Dissipation Concept (EDC) at low turbulence Reynolds numbers and low Damköhler numbers
Ertesvåg, Ivar Ståle (Peer reviewed; Journal article, 2022)Recent proposals to modify or extend the Eddy Dissipation Concept are investigated and compared to the standard EDC. The results with respect to the underlying principles of EDC are examined. A total of four different ... -
Study of MILD combustion using LES and advanced analysis tools
Zhiyi, Li; Tomasch, Stefanie; Chen, Zhi X.; Parente, Alessandro; Ertesvåg, Ivar Ståle; Swaminathan, Nedunchezhian (Peer reviewed; Journal article, 2020)A cylindrical confined combustor operating under MILD condition is investigated using LES. The combustion and its interaction with turbulence are modeled using two reactor based models, PaSR and EDC. Results show that the ... -
Understanding Energy Conversion in Combustion
Lorentzen, Simon Johan (Master thesis, 2021)I dette prosjektet har tre forskjellige modeller for flammer blitt undersøkt: forblandet velblandet reaktor, forblandet fritt-spredene flamme, og ikke-forblandet motstrøms flamme. Målet med prosjekter var å først bestemme ... -
Vapor-liquid equilibrium data for the carbon dioxide and nitrogen (CO2+N2) system at the temperatures 223, 270, 298 and 303 K and pressures up to 18 MPa
Westman, Snorre Foss; Stang, Hans Georg Jacob; Løvseth, Sigurd Weidemann; Austegard, Anders; Snustad, Ingrid; Størset, Sigmund Østtveit; Ertesvåg, Ivar Ståle (Journal article; Peer reviewed, 2015)A new setup for the measurement of vapor-liquid phase equilibria of CO2-rich mixtures relevant for carbon capture and storage (CCS) transport conditions is presented. An isothermal analytical method with a variable volume ... -
Vapor-liquid equilibrium data for the carbon dioxide and oxygen (CO2 + O2) system at the temperatures 218, 233, 253, 273, 288 and 298 K and pressures up to 14 MPa
Westman, Snorre Foss; Stang, Hans Georg Jacob; Løvseth, Sigurd Weidemann; Austegard, Anders; Snustad, Ingrid; Ertesvåg, Ivar Ståle (Journal article; Peer reviewed, 2016)Accurate thermophysical data for the CO2-rich mixtures relevant for carbon capture, transport and storage (CCS) are essential for the development of the accurate equations of state (EOS) and models needed for the design ... -
Vapor-liquid equilibrium measurement data for the two binary systems carbon dioxide + nitrogen and carbon dioxide + oxygen
Westman, Snorre Foss (Doctoral thesis at NTNU;2016:118, Doctoral thesis, 2016)This thesis presents new, accurate, isothermal vapor-liquid equilibrium (VLE) measurement data for the two binary systems carbon dioxide and nitrogen (CO2+N2) and carbon dioxide and oxygen (CO2+O2). These measurements ...