Simulating gas-liquid multiphase flow using meshless Lagrangian method

A multiphase flow model has been established based on a moving particle semi-implicit method. A surface tension model is introduced to the particle method to improve the numerical accuracy and stability. Several computational techniques are employed to simplify the numerical procedure and further improve the accuracy. A particle fraction multiphase flow model is developed and verified by a two-phase Poiseuille flow. The multiphase surface tension model is discussed in detail, and an ethanol drop case is introduced to verify the surface tension model. A simple dam break is simulated to demonstrate the improvements with various modifications in particle method along with a new boundary condition. Finally, we simulate several bubble rising cases to show the capacity of this new model in simulating gas-liquid multiphase flow with large density ratio difference between phases. The comparisons among numerical results of mesh-based model, experimental data, and the present model, indicate that the new multiphase particle method is acceptable in gas-liquid multiphase fluids simulation. Copyright (c) 2014 John Wiley & Sons, Ltd.