Browsing NTNU Open by Author "Lervåg, Karl Yngve"
Now showing items 1-7 of 7
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A consistent reduction of the two-layer shallow-water equations to an accurate one-layer spreading model
Fyhn, Eirik Holm; Lervåg, Karl Yngve; Ervik, Åsmund; Wilhelmsen, Øivind (Journal article; Peer reviewed, 2019)The gravity-driven spreading of one fluid in contact with another fluid is of key importance to a range of topics. These phenomena are commonly described by the two-layer shallow-water equations (SWE). When one layer is ... -
A robust method for calculating interface curvature and normal vectors using an extracted local level set
Ervik, Åsmund; Lervåg, Karl Yngve; Munkejord, Svend Tollak (Journal article, 2014)The level-set method is a popular interface tracking method in two-phase flow simulations. An often-cited reason for using it is that the method naturally handles topological changes in the interface, e.g. merging drops, ... -
Calculation of interface curvatures with the level-set method for two-phase flow simulations and a second-order diffuse-domain method for elliptic problems in complex geometries
Lervåg, Karl Yngve (Doktoravhandlinger ved NTNU, 1503-8181; 2013:214, Doctoral thesis, 2013)This thesis considers in the first part the mathematical modelling of incompressible two-phase flow, in particular the calculation of interface curvatures and normal vectors with the level-set method. The main contribution ... -
Calculation of the interface curvature and normal vector with the level-set method
Lervåg, Karl Yngve; Müller, Bernhard; Munkejord, Svend Tollak (Journal article, 2013)This article addresses the use of the level-set method for capturing the interface between two fluids. One of the advantages of the level-set method is that the curvature and the normal vector of the interface can be readily ... -
A combined fluid-dynamic and thermodynamic model to predict the onset of rapid phase transitions in LNG spills
Lervåg, Karl Yngve; Skarsvåg, Hans Langva; Aursand, Eskil; Ouassou, Jabir Ali; Hammer, Morten; Reigstad, Gunhild Allard; Ervik, Åsmund; Fyhn, Eirik Holm; Gjennestad, Magnus Aashammer; Aursand, Peder; Wilhelmsen, Øivind (Peer reviewed; Journal article, 2020)Transport of liquefied natural gas (LNG) by ship occurs globally on a massive scale. The large temperature difference between LNG and water means LNG will boil violently if spilled onto water. This may cause a physical ... -
Sharp interface simulations of surfactant-covered drops in electric fields
Teigen, Knut Erik; Lervåg, Karl Yngve; Munkejord, Svend Tollak (Chapter, 2010)A level-set method for computations of interfacial flows with insoluble surfactants with electric fields is presented. The discontinuities at the interface are captured in a sharp manner using the ghost-fluid method. The ... -
Simulation of two-phase flow with varying surface tension.
Lervåg, Karl Yngve (Master thesis, 2008)This thesis is a study on the effects of varying surface tension along an interface separating two fluids. Varying surface tension leads to tangential forces along the interface. This is often called the Marangoni effect. ...