文档介绍：上海交通大学硕士学位论文
锅炉燃烧器内气固两相流动的分区并行计算
摘要
当前,在解决传热与流动问题上,数值模拟已经成为一个非常
重要的工具,但是它往往受到电子计算机本身条件的限制,而对于
多相流动问题的数值模拟则更是需要耗费巨大的计算机资源。鉴于
高性能计算机价格昂贵,尚不能普遍应用,我们将许多计算能力相
对较低的个人计算机或工作站构建成集群系统,通过多机并行的方
式,以低廉的价格获得强大的计算能力,而 MPI(Message Passing
Interface)是目前被普遍采用的实现集群中消息传递的并行编程环
境。本文主要研究如何在基于局域网络的计算机集群上实现气固两
相流动问题的并行数值求解。
本文利用自行开发的基于非正交贴体坐标系的分区并行计算软
件,采用 kA−−ε P 气固两相湍流模型,对近出口处带有菱形障碍块的
锅炉燃烧器内的气固两相冷态流动进行了数值模拟。在数值求解过
程中,首先将整个几何区域分解成若干相对简单的非重叠子区域并
生成各自的贴体网格系统,然后分别在各子区域上采用 SIMPLE-C
算法对控制方程进行离散,最后再利用 Dirichlet-Neumann 交替算法
(简称 D-N 算法)实现分区并行计算。根据流体动力学理论和某些
出版物中发表的相关数据,通过对计算结果的比较、分析,证实了
燃烧器一次风喷咀带有菱形障碍块的结构对于炉膛内的稳定燃烧有
着非常重要的作用。此外,基于 MPI 编程环境的区域分解方法的实
施也获得了很高的并行效率,从而体现了个人计算机集群在数值求
解流动问题方面良好的适用性和高效性。
关键词:并行计算,MPI,区域分解法,气固两相流,kA−−ε P 模型,
燃烧器
上海交通大学硕士学位论文
PARTITIONING PUTATION
OF GAS-SOLID TWO-PHASE FLOW
IN A BOILER BURNER
ABSTRACT
Nowadays, numerical simulation is playing a more and more
important role in solving flow and heat transfer problems. But, it often
suffers from the resource limitation puter itself, especially for
multiphase flow problems. As the high cost limits extensive availability
of the high puter (HPC), a cluster system of personal
computers or workstations is growing up instead of HPC for the sake of
high performance cost ratio, which is based on puter parallel
computing methods, and MPI (Message Passing Interface) is a parallel
programming environment mon use for message passing in the
cluster system. This paper focuses on how to realize a parallel numerical
simulation of gas-solid two-phase flow under a LAN-puter
cluster system.
A partitioning puting procedure under nonorthogonal
body-fitted coordinate system is developed to numerically simulate the
gas-solid two-phase flow in a boiler burner with a diamond-shaped
barrier near the outlet, in which the kA−ε− P turbulence model is adopted.
In the numerical solution procedure, the whole domain is divided into a
number of relatively simple nonoverlapping sub-domains and the bo