Author(s): Elysia Grace Barker; Jian Guo Zhou

Linked Author(s):

Keywords: Drying; Lattice Boltzmann; Modelling; Shallow Water; Turbulence; Wetting

Abstract: In this paper, a wetting and drying technique for the enhanced lattice Boltzmann method for shallow water equations (eLABSWE) was improved by utilising the lattice Boltzmann turbulence (LABSWETM) model, which considers flow turbulence naturally by incorporating the standard subgrid-scale stress model into the lattice Boltzmann equation within the collision and streaming steps. To remain consistent, a version of the LABSWETM is incorporated into the wet-dry interface calculations. The eLABSWE is a promising model with its simplicity and flexibility which responds well to improvements, adaptations, and different complex flow cases. This method is excellent at accurately simulating flow around objects, particularly in areas where flow is strongly three-dimensional, and, with the use of the LABSWETM, turbulent flow is accurately simulated. As a result of this, it stands to reason that the eLABSWE would be ideal to model urban flash flooding. However, there are limitations arising from the eLABSWE, such as its heavy reliance on equilibrium distributions, and stability issues are easy to encounter with this type of flow. To overcome some of these issues, the incorporation of turbulence into the wet-dry interface calculations has improved the accuracy of more complex flows around the wet-dry boundary.

DOI: https://doi.org/10.3850/iahr-hic2483430201-101

Year: 2024