Improved pressure calculation for the moving particle semi-implicit method

被引：95

作者：

Shibata, Kazuya ^{[1
]}

Masaie, Issei ^{[2
]}

Kondo, Masahiro ^{[3
]}

Murotani, Kohei ^{[1
]}

Koshizuka, Seiichi ^{[1
]}

机构：

[1] Univ Tokyo, Sch Engn, Dept Syst Innovat, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1138656, Japan

[2] Prometech Software Inc, Bunkyo Ku, Tokyo 1130033, Japan

[3] Univ Tokyo, Sch Engn, Dept Nucl Engn & Management, Bunkyo Ku, Tokyo 1138656, Japan

来源：

COMPUTATIONAL PARTICLE MECHANICS | 2015年 / 2卷 / 01期

基金：

日本学术振兴会;

关键词：

MPS method; SPH; Particle clustering; Pressure oscillation; Boundary condition; Detection of free-surface particles; Low pressure;

D O I：

10.1007/s40571-015-0039-6

中图分类号：

O1 [数学];

学科分类号：

0701 ; 070101 ;

摘要：

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.

引用

页码：91 / 108

页数：18

共 44 条

[1] Numerical simulation of the flow around a planing body by MPS method [J].