dc.contributor.author | Olsen, Jan Erik | |
dc.contributor.author | Skjetne, Paal | |
dc.contributor.author | Johansen, Stein Tore | |
dc.date.accessioned | 2020-12-21T08:23:49Z | |
dc.date.available | 2020-12-21T08:23:49Z | |
dc.date.created | 2017-08-31T10:38:10Z | |
dc.date.issued | 2017 | |
dc.identifier.citation | Applied Mathematical Modelling. 2017, 44 61-71. | en_US |
dc.identifier.issn | 0307-904X | |
dc.identifier.uri | https://hdl.handle.net/11250/2720466 | |
dc.description.abstract | Traditional Reynolds-averaged Navier–Stokes (RANS) approaches to turbulence modeling, such as the k-ϵ model, have some well-known shortcomings when modeling transient flow phenomena. To mitigate this, a filtered URANS model has been derived where turbulent structures larger than a given filter size (typically grid size) is captured by the flow equations and smaller structures are modeled according to a modified k-ϵ model. This modeling approach is also known as a VLES model (Very Large Eddy Scale model), and provides more details of the transient turbulence than the k-ϵ model at little extra computational cost.
In this study a two-phase extension to the VLES model is described. A modeling concept for bubble plumes has been developed in which the bubbles are tracked as particles and the flow of liquid is solved by the Navier–Stokes equations in a traditional mesh based approach. The flow of bubbles and liquid is coupled in an Eulerian–Lagrangian model. Turbulent dispersion of the bubbles is treated by a random walk model. The random walk model depends on an estimation of the eddy life time. The eddy life time for the VLES model differs from a k-ϵ model, and its mathematical expression is derived.
The model is applied to ocean plumes emanating from discharge of gas at the ocean floor. Validation with experiments and comparison with k-ϵ model are shown. | en_US |
dc.language.iso | eng | en_US |
dc.publisher | Elsevier | en_US |
dc.rights | Attribution-NonCommercial-NoDerivatives 4.0 Internasjonal | * |
dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/4.0/deed.no | * |
dc.subject | Lagrangian | en_US |
dc.subject | CFD | en_US |
dc.subject | VLES | en_US |
dc.subject | turbulence | en_US |
dc.subject | plume | en_US |
dc.subject | bubble | en_US |
dc.title | VLES turbulence model for an Eulerian–Lagrangian modeling concept for bubble plumes | en_US |
dc.type | Peer reviewed | en_US |
dc.type | Journal article | en_US |
dc.description.version | acceptedVersion | en_US |
dc.rights.holder | This is the peer-reviewed, accepted manuscript of the article. The published article is available at ScienceDirect: https://doi.org/10.1016/j.apm.2017.01.031 | en_US |
dc.source.pagenumber | 61-71 | en_US |
dc.source.volume | 44 | en_US |
dc.source.journal | Applied Mathematical Modelling | en_US |
dc.identifier.doi | 10.1016/j.apm.2017.01.031 | |
dc.identifier.cristin | 1490133 | |
cristin.unitcode | 7401,80,0,0 | |
cristin.unitname | SINTEF Materialer og kjemi | |
cristin.ispublished | true | |
cristin.fulltext | postprint | |
cristin.qualitycode | 1 | |