An investigation for realization of general and rapid scheme of numbrical simulation of fluid flow

流体流动数值模拟通用快速方案的实现研究

基本信息

批准号：
60460101
负责人：
MIYAKE Yutaka
金额：
$ 4.67万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1985
资助国家：
日本
起止时间：
1985 至 1987
项目状态：
已结题

项目摘要

Rhia incwarifrion qa xeeiws our ro impeocw rhw xompuroe xosw ro mwwr rhw scnxw of the computor hardware. Some kinds of computor codes of flow simulation were made fast amd addaptive to wider flow conditions. Following flow fields were treated as the representative of flow. 1) viscous flow around a bydy, 2) Fully 3-D flow within impellers of turbomachineries, 3) Turbulent shear flow and 4) Acoustic field in a flow passage of complicated configulation.For problem 1), speed-up of the calculation was persued for the SOR and SLOR method which are employed in the finite difference calculation of the flow around a circular cylinder and a sphere submerged in a uniform flow. For the problem 2), a fast and highly accurate code for the direct problem of both incompressive and compressive flow in centrifugal and axial impellers of turbomachineries was realized on the basis of panel method. The calculation of influence factor was highly vectorized. A new method of employing spectral method for the … More treatment of non-linear terms for the case of compressive flow was also useful to speed-up the calculation. Also an inverseproblem for the same flow was freated on the basis of of actuator-duct method, which allowed us to design a impeller based on fully 3-D calculation within a reasonable computor time,i.e., less than 10 minutes for 1 run using SX-2. The problem 3) was the central part of this series of investigation. Newly developped code allowed to emoploy 4.2 million grids without using external memory and achieved more than 99% of the vectorization factor which made the calculation world record in size and at the same time 1/10 in computor time compared wity the ones available in litteratures. By this code, the basis of numerical simulation of turbulent sheaf flow was well established. A Patched grid technique was also tried in order to make the code adaptive to variety of flow fields. The problem 4) dealt with Helmholtz' equation and was treated by a panel method. The same technique as the problem 1) was applied to this problem.Also the fundamental solution of viscous acoustic wave equation was newly found. Less

rhia incwariffrion qa xeeiws我们的ro impeocw rhw xompuroe xosw xosw ro mwwr rhw rhw scnxw of Computing Hardware。某些流动模拟的计算机代码被快速AMD Addaptive到更广泛的流量条件。以下流场被视为流动的代表。 1）围绕bydy的粘性流动，2）在涡轮机械的理体中完全3-D流动，3）湍流流动和4）在复杂构型的流动中，有声场。对于问题1），对于SOR和SLOR方法进行了计算的加速，这些方法是在循环cylinder和Spheelder围绕流动的有限差分计算中进行的。对于问题2），根据面板方法，实现了涡轮机械的离心和轴向叶轮中不可压缩和压缩流的直接问题的快速而准确的代码。影响因子的计算被高度向量。一种采用光谱方法进行的新方法……对压缩流的情况进行更多的非线性项处理也可用于加速计算。同样，同一流程的逆问题也是根据执行器导管方法制备的，这使我们能够根据合理的计算时间（即使用SX-2运行1次运行）在合理计算时间内根据完全3-D计算来设计叶轮。问题3）是这一系列投资的中心部分。新开发的代码允许在不使用外部内存的情况下弹出420万个网格，并获得了超过99％的矢量化因子，从而使计算世界的记录在大小上，同时在计算机时间中1/10比较了文献中可用的量。通过此代码，良好确定了湍流捆包流量的数值模拟的基础。还尝试了一种修补的网格技术，以使代码适应各种流场。问题4）处理Helmholtz的方程式，并通过面板方法处理。与问题1）应用于此问题相同的技术。还新发现了粘性声波方程的基本解决方案。较少的