Study on Numerical Simulation of Flow around Body by MPS using Cluster System

基于集群系统的MPS绕体流数值模拟研究

基本信息

批准号：
15560691
负责人：
KAI Hisashi
金额：
$ 2.3万
依托单位：
National University Corporation Yokohama National University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2004
项目状态：
已结题

项目摘要

An existing two-dimensional particle method program was originally changed to the three-dimensional particle method code by this research, and an excellent result was obtained about the following three-dimensional flow compared with the experiment result and other numerical calculation results.The fluid phenomenon that was able to adjust to the particle method could be judged by showing a variety of numerical calculation results of this research.(1)Flow analysis around 3-dimensional plate that moved suddenlyA transitional fluid phenomenon was simulated by this method.As a result, it was clear that rapid phenomenon can be calculated by MPS.(2)Spray phenomenon when surface of the water collides by falling objectA triangular pillar was dropped, and the spray phenomenon momentarily generated when colliding with the surface of the water was simulated.As a result, the agreement with high accuracy could be seen compared with the experimental photograph with a high-speed camera.(3)Movement after surface of the water collides of falling objectThe hexahedron was diagonally discharged, and the fall to the surface of the water and the movement afterwards were simulated.As a result, a qualitative agreement was seen compared with the experiment result with the object with shape that looked like the hexahedron.(4)Three-dimensional rotational wings with simple shapeA basic calculation of the three-dimensional rotation wing was executed by using the hexahedron for the wing of the rotational wing.Physical validity could be obtained by changing to the shape with pitch from original shape without pitch although it was difficult to model the rotational wings with the pitch in the particle method.

本研究将现有的二维粒子法程序改为三维粒子法代码，与实验结果和其他数值计算结果相比，对于以下三维流动得到了优异的结果。通过显示本研究的各种数值计算结果，可以判断是否能够适应粒子法。（1）突然移动的3维板周围的流动分析通过该方法模拟了过渡流体现象。结果，很明显，快速现象可以通过以下方式计算MPS.(2)落物碰撞水面时的喷雾现象将三角柱落下，模拟与水面碰撞时瞬间产生的喷雾现象，结果可以看到高精度的一致性(3)落物碰撞水面后的运动将六面体斜向排出，模拟落到水面及其后的运动。结果与类似六面体形状的物体的实验结果得到了定性的一致。(4)简单形状的三维旋转翼利用六面体进行了三维旋转翼的基本计算。尽管在粒子法中很难对带有螺距的旋转机翼进行建模，但通过将原始无螺距形状更改为带有螺距的形状，可以获得物理有效性。