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Progress in Phenomenological Modeling of Turbulence Damping around a Two-Phase Interface
KTH, School of Engineering Sciences (SCI), Physics, Nuclear Engineering.
KTH, School of Engineering Sciences (SCI), Physics, Nuclear Engineering. Warsaw Univ Technol, Inst Heat Engn, 21-25 Nowowiejska St, PL-00665 Warsaw, Poland..ORCID iD: 0000-0001-5595-1952
2019 (English)In: FLUIDS, ISSN 2311-5521, Vol. 4, no 3, article id 136Article in journal (Refereed) Published
Abstract [en]

The presence of a moving interface in two-phase flows challenges the accurate computational fluid dynamics (CFD) modeling, especially when the flow is turbulent. For such flows, single-phase-based turbulence models are usually used for the turbulence modeling together with certain modifications including the turbulence damping around the interface. Due to the insufficient understanding of the damping mechanism, the phenomenological modeling approach is always used. Egorov's model is the most widely-used turbulence damping model due to its simple formulation and implementation. However, the original Egorov model suffers from the mesh size dependency issue and uses a questionable symmetric treatment for both liquid and gas phases. By introducing more physics, this paper introduces a new length scale for Egorov's model, making it independent of mesh sizes in the tangential direction of the interface. An asymmetric treatment is also developed, which leads to more physical predictions for both the turbulent kinetic energy and the velocity field.

Place, publisher, year, edition, pages
MDPI , 2019. Vol. 4, no 3, article id 136
Keywords [en]
two-phase flow, CFD, phenomenological modeling, turbulence damping, Egorov's model, asymmetric treatment
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-262799DOI: 10.3390/fluids4030136ISI: 000488029400011Scopus ID: 2-s2.0-85071514977OAI: oai:DiVA.org:kth-262799DiVA, id: diva2:1362540
Note

QC 20191021

Available from: 2019-10-21 Created: 2019-10-21 Last updated: 2019-10-21Bibliographically approved

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Fan, WenyuanAnglart, Henryk

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