Hydraulics & Waterways

Oral

394531 - Comparison of Various Turbulence Models for Violent Geysers in Vertical Pipes

Monday, June 4
10:30 AM - 12:00 PM
Location: Regency Room
Co-Authors: Arturo S. Leon, Houston, Texas – University of Houston

Four frequently used turbulence models, namely k-epsilon, realizable k-epsilon, k-omega and SST k-omega have been used for simulating violent geysers in vertical pipes. The simulations have been performed using OpenFOAM and the assessment of the adopted models has been carried out by comparing the results with a set of experimental data from the literature. The quantities compared are pressure traces at certain locations, geyser height and snapshots in the horizontal and vertical pipes at various stages during the geysering. The comparison of turbulence models suggests that all of these models predict almost the same geyser height with a difference of less than 2%. Pressure fluctuations predicted by realizable k-epsilon and SST k-omega models, however, are in better agreement with the data. Additionally, comparison of experimental and numerical snapshots reveals that the flow patterns obtained using the realizable k-epsilon model matches those of the experiments more closely. Regarding the computation time, k-epsilon model outperformed other models, as CPU times of k-omega, SST k-omega and realizable k-epsilon models were 1.5, 1.2 and 1.1 times that of k-epsilon model, respectively.

Khang Minh. Phan

University of Houston

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Taher Chegini

PhD Student
University of Houston

My name is Taher Chegini and I am a PhD student at the Civil Engineering Department. of University of Houston, Texas.

My research is mainly on numerical and experimental investigation of geysers in stormwater and sewer systems. I use an open source package, OpenFOAM, for numerical simulations that provides a powerful framework for further developement. Our group has a well-equipped laboratory for conducting expeirments related to study of multiphase phase flows in conduits.

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394531 - Comparison of Various Turbulence Models for Violent Geysers in Vertical Pipes



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