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Development of large-scale numerical analysis system of particle complex systems

大规模粒子复杂系统数值分析系统开发

基本信息

批准号：
10555060
负责人：
TSUJI Yutaka
金额：
$ 7.3万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10555060/
关键词：
multi-phase flow gas-solid two-phase flow fluidized bed numerical simulation discrete element method PTV 回転二重円筒 PIV

项目摘要

We developed a computer system to make large-scale numerical analysis by installing large memories on a computer. Although the DEM (discrete element method) simulation has been applied only for 2D or small-scale systems so far, it can be applied to large-scale systems with our system. We performed the large-scale numerical analysis for three-dimensional gas-solid two-phase flows, for example, plug flows in a vertical pipe, spouted beds in a cylindrical vessel and fluidized beds in a rectangular vessel. Althogh the calculation of the fluid motion was simplified to 1D or 2D depending on the cases, the obtained three-dimensional flow pattern agreed well with corresponding experiments.We performed DEM simulations also for problems of the breakage of a simgle particle and the particle motion in concentric cylinders. In these calculations, the number of particles is not very large. However, the computational load is big because large memories are needed to keep additional attractive forces or long continuous computation is needed to obtain the steady state. The present system was very available also for such problems.Furthermore we developed a PTV measurement system to track the motion of particles in experiments. We applied this measurement system to the particle motion in a two-dimensional fluidized bed. We compared measured flow patterns with those of the DEM simulation. We found good agreement with each other in the particle motion around bubbles.

我们开发了一种计算机系统，通过在计算机上安装大容量存储器来进行大规模数值分析。尽管迄今为止DEM（离散元法）模拟仅应用于二维或小规模系统，但通过我们的系统，它可以应用于大规模系统。我们对三维气固两相流进行了大规模数值分析，例如垂直管道中的活塞流、圆柱形容器中的喷动床和矩形容器中的流化床。尽管根据情况将流体运动的计算简化为一维或二维，但获得的三维流型与相应的实验吻合良好。我们还对单个颗粒的破碎和同心圆柱体中的颗粒运动问题进行了DEM模拟。在这些计算中，粒子的数量并不是很多。然而，计算量很大，因为需要大内存来保持额外的吸引力，或者需要长时间连续计算才能获得稳定状态。本系统对于此类问题也非常有用。此外，我们开发了 PTV 测量系统来跟踪实验中粒子的运动。我们将该测量系统应用于二维流化床中的颗粒运动。我们将测量的流动模式与 DEM 模拟的流动模式进行了比较。我们发现气泡周围的粒子运动彼此非常一致。