Study of bubbly flows in an open-source software

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.advisor Laurila, Erkki
dc.contributor.author Calvo Luz, Andres
dc.date.accessioned 2018-06-29T08:49:48Z
dc.date.available 2018-06-29T08:49:48Z
dc.date.issued 2018-06-11
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/32464
dc.description.abstract Bubbly flows occur everywhere in nature and engineering. The study of such flows can be done theoretically, experimentally or computationally. In the present thesis, latter option was chosen and multiphase computational fluid dynamics (M-CFD) simulation methods are tested for simulation of a specific situation of such flows. All the simulations done under this thesis are about an initially spherical bubble starting from rest in quiescent water. In order to accurately assess the dynamics of that bubble an open-source M-CFD software was used, OpenFOAM. The dynamics of the bubble was set by means of the study of three characteristics: rise velocity, trajectory and shape. Here, a Matlab algorithm was developed to get the rise velocity of the bubble. Two cases have been simulated based on Krishna et al. (1999) experimental, simulated and numerical data base, one in two dimensions and the other in three dimensions, both were computed to a range of bubble between 4 and 12 millimeters in diameter. The simulations were carried out using a geometric Volume-Of-Fluid (VOF) method, IsoAdvector which utilizes iso-surfaces in the subcell interface reconstruction step. This algorithm provides results that are close agreement with the experimental, simulated and numerical data already named, and also in close agreement with the experimental rise velocities of Haberman et al. (1953) investigation. Furthermore, the rise velocity equation proposed by Jamialahmadi et al. (1994) and the bubble shapes shown in Kumar Tripathi et al. (2015) simulations match with the simulations of the present study. Therefore, these results verify the capability of OpenFOAM simulations with IsoAdvector algorithm, which are powerful tools for a priori determination of the morphology and rise characteristics of an initially spherical bubble starting from rest in quiescent water and yield on the same level as ANSYS-CFX commercial software. en
dc.format.extent 72+2
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.title Study of bubbly flows in an open-source software en
dc.type G2 Pro gradu, diplomityö fi
dc.contributor.school Insinööritieteiden korkeakoulu fi
dc.subject.keyword open-source en
dc.subject.keyword rise velocity en
dc.subject.keyword trajectory en
dc.subject.keyword bubble shape en
dc.subject.keyword IsoAdvector en
dc.subject.keyword M-CFD en
dc.identifier.urn URN:NBN:fi:aalto-201806293874
dc.programme.major fi
dc.programme.mcode ENG21 fi
dc.type.ontasot Master's thesis en
dc.type.ontasot Diplomityö fi
dc.contributor.supervisor Vuorinen, Ville
dc.programme Master's Programme in Energy Technology (EEN) fi
local.aalto.electroniconly yes
local.aalto.openaccess yes


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