Author Identifier

Kudzai Chipongo

Medhi Khiadani

Document Type

Journal Article

Publication Title

Scientific Reports


Springer Nature


School of Engineering




Edith Cowan University - Open Access Support Scheme 2020


Chipongo, K., Khiadani, M., & Lari, K. S. (2020). Comparison and verification of turbulence Reynolds-averaged Navier–Stokes closures to model spatially varied flows. Scientific Reports, 10(1), article 19059.


The robustness and accuracy of Reynolds-averaged Navier–Stokes (RANS) models was investigated for complex turbulent flow in an open channel receiving lateral inflow, also known as spatially varied flow with increasing discharge (SVF). The three RANS turbulence models tested include realizable kε, shear stress transport kω and Reynolds stress model based on their prominence to model jets in crossflows. Results were compared to experimental laser Doppler velocimetry measurements from a previous study. RANS results in the uniform flow region and farther from the jet centreline were more accurate than within the lateral inflow region. On the leeward side of the jet, RANS models failed to capture the downward velocity vectors resulting in major deviations in vertical velocity. Among RANS models minor variations were noted at impingement and near the water surface. Regardless of inadequately predicting complex characteristics of SVF, RANS models matched experimental water surface profiles and proved more superior to the theoretical approach currently used for design purposes.



Creative Commons License

Creative Commons Attribution 4.0 License
This work is licensed under a Creative Commons Attribution 4.0 License.

Research Themes

Natural and Built Environments