CFD modeling of flow and local scour around submerged bridge decks

Authors

  • Gábor Fleit Department of Hydraulic and Water Resources Engineering, Faculity of Civil Engineering, Budapest University of Technology and Economics, Budapest, Hungary
  • Sándor Baranya Department of Hydraulic and Water Resources Engineering, Faculity of Civil Engineering, Budapest University of Technology and Economics, Budapest, Hungary
  • Ronja Ehlers Department of Civil and Environmental Engineering, Norwegian University of Science and Technology
  • Hans Bihs Department of Civil and Environmental Engineering, Norwegian University of Science and Technology

DOI:

https://doi.org/10.48438/jchs.2023.0026

Keywords:

CFD modeling, Free surface flow, Pressure scour, RANS model, Sediment transport, Submerged bridge

Abstract

In this study, the level set method-based, multiphase hydro- and morphodynamic numerical model REEF3D is used for the simulation of the flow conditions and local scouring around submerged bridge decks. Presence of hydraulic jumps, bridge overtopping, pressurized jets and the resulting scouring make the selected test cases especially challenging from the numerical modelling point of view. The models are validated against data from laboratory experiments. The influence of the submergence ratio on the prevailing flow and scouring is investigated. The level set method showed robustness and good accuracy for the treatment of the complex free surface as well as for the tracking of the mobile bed. The submergence ratio showed no clear correlation with the prevailing erosion/deposition patterns. As the simulations offered insights into the prevailing hydrodynamics and thus the relevance of numerical modelling was emphasized for such complex sediment transport problems.

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Published

2023-09-21 — Updated on 2023-09-21

How to Cite

Fleit, G., Baranya, S., Ehlers, R., & Bihs, H. (2023). CFD modeling of flow and local scour around submerged bridge decks. Journal of Coastal and Hydraulic Structures, 3. https://doi.org/10.48438/jchs.2023.0026

Issue

Vol. 3 (2023)

Section

Research Articles

License

Copyright (c) 2023 Gábor Fleit, Sándor Baranya, Ronja Ehlers, Hans Bihs

Creative Commons License

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

The authors declare that they have either created all material in the manuscript themselves, or have traceable permission from the copyright holder to use it in the present manuscript. They acknowledge that the manuscript will be placed on the JCHS website under the CC-BY 4.0 licence. They will retain copyright of the paper, and will remain fully liable for any breaches of copyright or other Intellectual Property violations arising from the manuscript.