An explicit particle method for simulation of multiphase flows

Weakly-compressible Moving particle simulation (WCMPS) is a Lagrange meshless method that is advantageous in solving complex fluid problems. Although the accuracy can be addressed in WCMPS, instability arises due to pressure fluctuations from particle clustering. Weakly Compressible Moving Particle Explicit (WCMPE) method improved the pressure calculation and stability of WCMPS while preserving its coding system with high computational efficiency. In this study, the multiphase WCMPE method is developed with a simple density smooth technique and interface detection procedure. Several numerical cases were investigated by the multi-phase WCMPE method, including Rayleigh-Taylor (R-T) instability cases with various density and viscosity ratio conditions, oil spill and oil-water sloshing experiments. In general, good agreements with analytical solutions or from experimental data were obtained in multiphase WCMPE results with negligible unphysical pressure oscil-lation and pressure noise points.