Research on Coanda effect of surface jet by Remold Stress Model

FU Xiaoli

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Research on Coanda effect of surface jet by Remold Stress Model

FU Xiaoli * #

School of Water Resources and Hydropower Engineering ,Wuhan university, WuHan 430072

*Correspondence author

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Funding: Research Fund for the Doctoral Program of Higher Education of China（No.No.20090141120030）, the National Nature Science Foundation of China （No.No.50909075 ）

Opened online:14 November 2012

Accepted by: none

Citation: FU Xiaoli.Research on Coanda effect of surface jet by Remold Stress Model[OL]. [14 November 2012] http://en.paper.edu.cn/en_releasepaper/content/4494487

In this paper, Coanda effect is observed to attract the water to free surface. A surface jet attracts water from the surroundings and the phenomenon is called water entrainment, which is found to be resulting from one of the combined effects-Coanda effect. To capture these surface currents several turbulence model are used. In this paper, two isotropic and anisotropic turbulent models (standard k-ε, Realizable k-ε and RSM) are employed with different boundary conditions to compare with the experimental data. The simulated results indicated Realizable k- ε and standard are unable to capture streamwise vorticity and surface current. The RSM with proper boundary condition is proved to have good agreement with experimental data and to predict the Coanda effect best. The results showed that an anisotropic RANS model with the appropriate boundary conditions can give good results for the surface jets, at least for this simple geometry. It also can predict the Coanda effect more properly than the isotropic models.

Keywords:Environmental hydraulics; Coanda effect; RANS model

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