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Numerical modelling of wave transformation and runup over rough fringing reefs using VARANS equations
Highlights A porous media model coupled in the RANS model is used to model rough reef surface. Various forcing conditions, morphological features and roughness factors are tested for wave runup. An empirical formula is proposed to predict wave run-up via numerical simulations. The effects of roughness on wave skewness, symmetry and Ursell number are examined.
Abstract Computational Fluid Dynamics (CFD) models are gaining popularity recently in efforts to understand the complex dynamics of wave interaction with coral reef profiles. To provide an alternative approach to the current CFD models to account for the reef surface with large bottom roughness, a 3D numerical wave tank based on the CFD tool OpenFOAM® is developed in this study. The VARANS equations are solved for two-phase incompressible flow with the k-ω SST model for the turbulence closure and VOF method for tracking the free surface. The reef surface with high friction is modeled by using a porous media model in the VARANS equations. The numerical model is first validated with laboratory experiments. The model is then applied to evaluate the impacts of forcing condition (wave and water level), reef morphology (reef-flat width, fore-reef slope, and back-reef slope), and reef roughness on wave transformation and wave runup. Moreover, an empirical formula is derived from the numerical results to predict wave runup. Subsequently, the simulated cross-reef variations of energy dissipation, wave spectrum, wave shape parameters (skewness and asymmetry) and nonlinearity parameter (Ursell number) are discussed for both the smooth and rough reefs. Finally, the cross-reef variations of the TKE and its dissipation rate are also examined for both reefs via the numerical simulations.
Numerical modelling of wave transformation and runup over rough fringing reefs using VARANS equations
Highlights A porous media model coupled in the RANS model is used to model rough reef surface. Various forcing conditions, morphological features and roughness factors are tested for wave runup. An empirical formula is proposed to predict wave run-up via numerical simulations. The effects of roughness on wave skewness, symmetry and Ursell number are examined.
Abstract Computational Fluid Dynamics (CFD) models are gaining popularity recently in efforts to understand the complex dynamics of wave interaction with coral reef profiles. To provide an alternative approach to the current CFD models to account for the reef surface with large bottom roughness, a 3D numerical wave tank based on the CFD tool OpenFOAM® is developed in this study. The VARANS equations are solved for two-phase incompressible flow with the k-ω SST model for the turbulence closure and VOF method for tracking the free surface. The reef surface with high friction is modeled by using a porous media model in the VARANS equations. The numerical model is first validated with laboratory experiments. The model is then applied to evaluate the impacts of forcing condition (wave and water level), reef morphology (reef-flat width, fore-reef slope, and back-reef slope), and reef roughness on wave transformation and wave runup. Moreover, an empirical formula is derived from the numerical results to predict wave runup. Subsequently, the simulated cross-reef variations of energy dissipation, wave spectrum, wave shape parameters (skewness and asymmetry) and nonlinearity parameter (Ursell number) are discussed for both the smooth and rough reefs. Finally, the cross-reef variations of the TKE and its dissipation rate are also examined for both reefs via the numerical simulations.
Numerical modelling of wave transformation and runup over rough fringing reefs using VARANS equations
Yao, Yu (author) / Chen, Xianjin (author) / Xu, Conghao (author) / Jia, Meijun (author) / Jiang, Changbo (author)
Applied Ocean Research ; 118
2021-10-26
Article (Journal)
Electronic Resource
English
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