ISSN 1000-1239 CN 11-1777/TP

• 系统结构 •

### 基于HDF5实现多区结构网格CFD程序的并行I/O

1. (国防科学技术大学并行与分布处理国防科技重点实验室 长沙 410073) (yanglipeng009@163.com)
• 出版日期: 2015-04-01
• 基金资助:
基金项目：航天支撑基金项目(2012-HT-GFKD-19)；空气动力学国家重点实验室基金项目(SKLA20130105)

### HDF5 Based Parallel I/O Techniques for Multi-Zone Structured Grids CFD Applications

Yang Lipeng, Che Yonggang

1. (Science and Technology on Parallel and Distributed Processing Laboratory, National University of Defense Technology, Changsha 410073)
• Online: 2015-04-01

Abstract: Computational fluid dynamics (CFD) is one of the most important high performance computing (HPC) areas. CFD applications commonly access large volumes of data. In case of large-scale CFD parallel computing, serial I/O performance does not match the computing performance, hence it becomes the performance bottleneck. Parallel I/O is an effective way to solve this problem. HDF5 (hierarchical data format v5) has provided excellent mechanisms to manage scientific data as well as effective ways to implement parallel I/O. High-order simulator for aerodynamics (HOSTA) is a multi-zone structured grids CFD application that can solve real world flow problems. This paper implements the parallel I/O method in HOSTA, based on the HDF5 file format and corresponding parallel I/O application programming interface. Detailed performance evaluation is performed with real CFD simulation cases on a HPC system equipped with 6 I/O service nodes. The results show that our method is both scalable and efficient. For a delta wing test case, parallel I/O achieves the performance speedup of 21.27 compared with the serial I/O. It achieves maximal I/O throughput of 5.81GBps and improves the application’s performance by over 10%, as compared with the original code. For a simple airfoil test case with larger grid size, our parallel I/O achieves maximal I/O throughput of 6.72GBps.