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This paper presents an improved incompressible smoothed particle hydrodynamics (ISPH) method for wave impact applications. In most conventional ISPH techniques the source term of the pressure Poisson equation (PPE) is usually treated by either a density invariant or a velocity divergence-free formulation. In this work, both the density invariant and velocity divergence free formulations are combined in a weighted average form to determine the source term. The model is then applied to two problems: (1) dam-breaking wave impact on a vertical wall and (2) solitary wave run-up and impact on a coastal structure. The computational results have indicated that the combined source term treatment can predict the wave impact pressure and force more accurately compared with using either formulation alone. It was further found that depending on the application case, the influence of the density invariant and divergence-free parts could be quite different. For the more violent wave impact case, the divergence-free part played a more prominent role in ensuring accurate force simulations, while in less violent wave impact cases, the density invariant part seems to be more significant. A systematic parametric study has shown that the weighting coefficient in the PPE source term is independent of particle spacing under various wave impact situations. Also, a close relationship has been found between the ratio of flow height to length scales [Math Processing Error] and weighting coefficient [Math Processing Error] in the mixed pressure source term.
|Number of pages||14|
|Journal||Journal of Waterway, Port, Coastal, and Ocean Engineering|
|Early online date||2 Oct 2013|
|Publication status||Published - May 2014|
- Density invariant
- Pressure Poisson equation
- Velocity divergence free
- Source term
- Particle spacing
- Incompressible smoothed particle hydrodynamics
- Weighting coefficient
- Wave impact
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- 1 Finished
Interactions of Flow, Tidal Stream Turbines and Local Sediment Bed Under Combined Waves and Tidal Conditions (INSTRON) (Joint with Universities of Hull, Liverpool, Strathclyde and the National Oceanographic Centre)
Davies, P., Davies, P. & Dong, P.
28/09/12 → 27/02/16