Journal
COMPUTATIONAL PARTICLE MECHANICS
Volume 2, Issue 1, Pages 91-108Publisher
SPRINGER INTERNATIONAL PUBLISHING AG
DOI: 10.1007/s40571-015-0039-6
Keywords
MPS method; SPH; Particle clustering; Pressure oscillation; Boundary condition; Detection of free-surface particles; Low pressure
Funding
- Japan Society for the Promotion of Science [25420860]
- Grants-in-Aid for Scientific Research [26390127, 25420860] Funding Source: KAKEN
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We developed a practical technique for calculating pressures and pressure gradients for the moving particle semi-implicit (MPS) method. Specifically, a new free-surface boundary condition for the pressure Poisson equation was developed by assuming that there are virtual particles over the surface. We treat the pressure of the virtual particles as a known value. A single liquid-phase flow is simulated taking into account the pressure of these virtual particles. A technique for detecting surface particles also was developed and used for accurately imposing the free-surface boundary condition. The pressure gradient model was modified to mitigate particle clustering and a single-layer wall model was developed to reduce the number of wall particles. We applied our technique to several problems, verifying that virtual surface particles suppress pressure oscillations and particle clusterings. The technique enables reliable differences in free-surface pressures to be taken and simulates instances of lower fluid pressure than that of a free surface.
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