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Technical Papers
Feb 17, 2023

Shallow-Flow Velocity Predictions Using Discontinuous Galerkin Solutions

Publication: Journal of Hydraulic Engineering
Volume 149, Issue 5

Abstract

Numerical solvers of the two-dimensional (2D) shallow water equations (2D-SWE) can be an efficient option to predict spatial distribution of velocity fields in quasi-steady flows past or throughout hydraulic engineering structures. A second-order finite-volume (FV2) solver spuriously elongates small-scale recirculating eddies within its predictions, unless sustained by an artificial eddy viscosity, while a third-order finite-volume (FV3) solver can distort the eddies within its predictions. The extra complexity in a second-order discontinuous Galerkin (DG2) solver leads to significantly reduced error dissipation and improved predictions at a coarser resolution, making it a viable contender to acquire velocity predictions in shallow flows. This paper analyses this predictive capability for a grid-based, open source DG2 solver with reference to FV2 or FV3 solvers for simulating velocity magnitude and direction at the submeter scale. The simulated predictions are assessed against measured velocity data for four experimental test cases. The results consistently indicate that the DG2 solver is a competitive choice to efficiently produce more accurate velocity distributions for the simulations dominated by smooth flow regions.

Practical Applications

The estimation of the spatial distribution of horizontal velocity fields is useful to analyze the design of hydraulic and flood-defense structures undergoing shallow water flow processes. Examples include flooding through a residential area with piered buildings where recirculation flow eddies occur within side cavities, past building blocks, and across of street junctions. This paper demonstrates the utility of a relatively new hydraulic simulation tool, the second-order discontinuous Galerkin (DG2) solver, as an alternative to existing finite-volume solvers featured in popular tools such as HEC-RAS 2D, Rubar20, Iber, and TUFLOW-HPC. The DG2 solver is open source, as part of the LISFLOOD-FP 8.0 software suite, and particularly excels in the estimation of velocity fields that are more informative of the flow processes within a few minutes of simulation time. The proposed simulation tool is limited to modeling problems where the depth-integrated assumption of the shallow water equations is appropriate.

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Data Availability Statement

Some or all data, models, or code generated or used during the study are available in a repository or online in accordance with funder data retention policies. The code to run the solvers is openly available on LISFLOOD-FP 8.0 available on Zenodo (https://doi.org/10.5281/zenodo.6912932) or on the local repository of the University of Sheffield (2021). The setup files to run the four test cases are available on Zenodo (https://doi.org/10.5281/zenodo.6914888).

Acknowledgments

Georges Kesserwani acknowledges the support of the UK Engineering and Physical Sciences Research Council, Grant IDs EP/R007349/1 and EP/K040405/1; and Janice Lynn Ayog acknowledges the support from the Malaysian Ministry of Education and Universiti Malaysia Sabah, Malaysia. We thank Xitong Sun for his valuable insights on the analysis of the simulation results.

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Journal of Hydraulic Engineering
Volume 149Issue 5May 2023

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Received: Feb 14, 2022
Accepted: Nov 14, 2022
Published online: Feb 17, 2023
Published in print: May 1, 2023
Discussion open until: Jul 17, 2023

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Georges Kesserwani, Ph.D. [email protected]
Research Fellow and Senior Lecturer, Dept. of Civil and Structural Engineering, Univ. of Sheffield, Mappin St., Sheffield City Centre, Sheffield S1 3JD, UK (corresponding author). Email: [email protected]
Ph.D. Candidate, Dept. of Civil and Structural Engineering, Univ. of Sheffield, Mappin St., Sheffield City Centre, Sheffield S1 3JD, UK. ORCID: https://orcid.org/0000-0003-3930-1882. Email: [email protected]
Mohammad Kazem Sharifian, Ph.D. [email protected]
Research Associate, Dept. of Civil and Structural Engineering, Univ. of Sheffield, Mappin St., Sheffield City Centre, Sheffield S1 3JD, UK. Email: [email protected]
Domenico Baú, Ph.D [email protected]
Senior Lecturer, Dept. of Civil and Structural Engineering, Univ. of Sheffield, Mappin St., Sheffield City Centre, Sheffield S1 3JD, UK. Email: [email protected]

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ASCE Library Cards let you download journal articles, proceedings papers, and available book chapters across the entire ASCE Library platform. ASCE Library Cards remain active for 24 months or until all downloads are used. Note: This content will be debited as one download at time of checkout.

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Save for later Information on ASCE Library Cards
ASCE Library Cards let you download journal articles, proceedings papers, and available book chapters across the entire ASCE Library platform. ASCE Library Cards remain active for 24 months or until all downloads are used. Note: This content will be debited as one download at time of checkout.

Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.
ASCE Library Card (5 downloads)
$105.00
Add to cart
ASCE Library Card (20 downloads)
$280.00
Add to cart
Buy Single Article
$35.00
Add to cart

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