Mesh-free particle modelling of air-water interaction

Ahmad Shakibaeinia

Monday 29 june 2015

15:05 - 15:20h at Central America (level 0)

Themes: (T) Special session, (ST) Smoothed particle hydrodynamics and other meshfree methods

Parallel session: 2H. Special session: Smoothed Particle Hydrodynamics and other meshfree methods

Air-water interaction is encountered in many areas of water and hydraulic engineering. Air entrainment in hydraulic structures, sea-atmosphere interaction through wave break, and bubble plumes in water and wastewater treatment plants are only few examples of the common occurrence of air-water interaction. Due to the complex nature of the air-water multiphase systems, which is characterized by large interfacial deformation/ fragmentation and large density discontinuity, they are still beyond the capabilities of the conventional (mesh-based) numerical methods for many applications. Recent developments in a new and revolutionary generation of numerical methods, the mesh-free Lagrangian (particle) methods, have provided a promising opportunity to overcome such limitations for the robust simulation of large interfacial deformations/fragmentations, involved in air-water interaction. This study will develop a mesh-free particle method based on the weakly-compressible Moving Particle Semi-implicit (WC-MPS) formulation (developed by the author) for modelling of air-water interaction. The required algorithms are developed to stabilize the method for large interfacial discontinuities and highly localized surface tension forces. The final model is validated using the air-water interaction benchmarks cases and then is applied for study of air-water interaction in hydraulic jump.