[3G06-09] Advanced Simulation

[3G08] Compact MPS method with high accuracy and computational efficiency

*Zidi Wang¹, Toshinori Matsumoto¹ (1. JAEA)

Keywords:MPS method, Free-surface flow, multi-phase flow, Compact scheme

The moving particle semi-implicit (MPS) method has been widely applied to nuclear severe accident analyses due to its unique meshless framework and Lagrangian nature in capturing moving interfaces or phase change. However, a large effective radius is usually required to ensure stable and precise discretization, increasing the computational cost. This study presents a new meshfree particle method called the compact moving particle semi-implicit (CMPS) method for incompressible free-surface and multiphase flows. In contrast to the existing particle methods, the first-order and second-order derivatives are discretized separately in the CMPS, enhancing the numerical stability significantly. By adopting a small effective radius, the CMPS can remarkably improve accuracy and reduce computational costs.