Numerical investigation of solitary wave attenuation and mitigation caused by vegetation using OpenFOAM

ABSTRACT

Wave energy can be reduced by coastal vegetation, which is an important aspect of coastal protection engineering. The effect of vegetation characteristics on solitary wave propagation and attenuation is numerically investigated in this study. A 3D numerical model is established based on the Reynolds Averaged Navier Stokes (RANS) equations combined with k-ω shear stress transport (SST) turbulence model, and the Volume of Fluid (VOF) method is used to capture the free water surface. This model is first validated by a series of physical experimental results with high accuracy. Subsequently, the model is used to simulate the interaction between solitary waves and submerged vegetation with different densities, submergence ratios, and distribution modes. The results indicate that the density and submergence ratios of submerged vegetation significantly affect the propagation and attenuation of solitary waves under uniform distribution modes. Compared with the condition of the uniform distribution mode, the solitary wave dissipates more energy after passing through the vegetation zone under the non-uniform distribution modes. Large differences in velocity fields are found for uniform/non-uniform distribution modes, which contribute to understanding the wave dissipation influenced by vegetation characteristics.

KEYWORDS:

• Numerical simulation
• OpenFOAM
• interaction of wave and vegetation
• wave attenuation
• submergence ratio
• vegetation random distribution

Acknowledgements

This work was supported by the National Nature Science Foundation of China [Grant Number 51879028; U21A20155], and Dalian Science and Technology Innovation Fund Project [Grant Number 2021JJ11CG001].

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

The work was supported by the the National Nature Science Foundation of China [51879028, U21A20155].