CFD Analysis of S-Gamma Model Coupled with Two-Group Interfacial Area Transport Equations and AMUSIG Model for a Large Diameter Pipe


This paper describes the modeling of flow regimes beyond bubbly flows in a large diameter channel considering polydispersity and bubble induced turbulence using the Eulerian two-fluid approach. A two-bubble-group approach with two-group interfacial area transport equations (IATEs) is used to demonstrate flow phenomena in a large diameter pipe. Source and sink terms for mass and momentum exchanges between the two groups of bubbles and for bubble coalescence and breakup mechanisms are implemented. For predicting particle size and its distribution, S-Gamma (S?) model is used. The S? model with two-group IATEs are evaluated by comparing local distributions of void fractions and Sauter mean diameters with results of adaptive-multiple-size-group (AMUSIG) models and experimental dataset developed by Schlegel et al., (2012) for model validations. It shows that two-group IATEs with S? model predict reasonably accurate flow characteristics of beyond bubbly flow regimes, but also show shortcomings in their accuracies predicting local distributions, which imply that further studies for modeling of interfacial force are needed.

Meeting Name

2020 International Conference on Nuclear Engineering collocated with the ASME 2020 Power Conference (2020: Aug. 4-5, Virtual)


Nuclear Engineering and Radiation Science

Research Center/Lab(s)

Center for High Performance Computing Research

Keywords and Phrases

IATE; Large Diameter Pipe; Multiphase Flow; MUSIC; Population Balance; S-Gamma

International Standard Book Number (ISBN)


Document Type

Article - Conference proceedings

Document Version


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© 2020 American Society of Mechanical Engineers (ASME), All rights reserved.

Publication Date

05 Aug 2020