Parallel computing strategy for a flow solver based on immersed boundary method and discrete stream-function formulation

Parallel computing strategy for a flow solver based on immersed boundary method and discrete stream-function formulation
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基于浸入边界法和离散流函数公式的流求解器并行计算策略

DOI:
10.1016/j.compfluid.2013.09.001
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发表时间:
2013-12
期刊:
Computers & Fluids
影响因子:
--
通讯作者:
Zhang X
Zhang X
中科院分区:
其他
文献类型:
--
作者:
Wang SZ;He GW;Zhang X

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介绍了一种用于复杂几何流动的并行浸没边界求解器的研制。不可压Navier-Stokes方程的数值方法基于离散流函数格式和非结构笛卡尔网格框架。采用域分解(DD)方法和单程序多数据(SPMD)编程模式实现代码并行化,进程间通过MPI协议进行数据通信。采用“聚散”策略处理浸没边界上的力计算。进行了三维盖子驱动的空腔流动、容器中球体的沉积以及圆柱体阵列中和周围的流动三项测试,以评估该程序的并行效率。在工作站集群上的这些测试中获得的加速比对于问题大小高达1000万和进程数在16-2048之间的范围是相当好的。
The development of a parallel immersed boundary solver for flows with complex geometries is presented. The numerical method for incompressible Navier–Stokes equations is based on the discrete stream-function formulation and unstructured Cartesian grid framework. The code parallelization is achieved by using the domain decomposition (DD) approach and Single Program Multiple Data (SPMD) programming paradigm, with the data communication among processes via the MPI protocol. A ‘gathering and scattering’ strategy is used to handle the force computing on the immersed boundaries. Three tests, 3D lid-driven cavity flow, sedimentation of spheres in a container and flow through and around a circular array of cylinders are performed to evaluate the parallel efficiency of the code. The speedups obtained in these tests on a workstation cluster are reasonably good for the problem size up to 10 million and the number of processes in the range of 16–2048.
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