Development of massively parallel simulation software applied to multi-physics effect with electromagnetic pluses excitation
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摘要: 介绍了自主研发的强电磁脉冲多物理效应并行计算程序JEMS-CDS-System的情况，该程序采用时域有限元方法，基于JAUMIN并行自适应结构网格支撑框架研制，并行效能高，可扩展性强，且支持动态负载平衡。通过算例测试表明，该程序对于键合线的电-热-应力失效过程的最高温度与范式等效应力计算结果与COMSOL软件计算结果吻合较好；SiP功率放大模块的热-应力耦合天河2高性能计算平台并行计算结果表明，该程序在CPU1024核时，具有38.1%并行效率。Abstract: This paper presents the study of massively parallel simulation of multi-physics effect with electromagnetic pluses excitation using a high-performance computing scheme based on JAUMIN. Our in-house time-domain finite element parallel program JEMS-CDS-System is employed for simulating the electro-thermo-mechanical responses of bonding wire arrays and their highest temperatures and von Mises stress are captured and validated in comparison with those of the commercial simulator COMSOL. The thermo-mechanical responses of a part of SiP are simulated and parallel efficiency of our parallel program is assessed by the experiment of its strong parallel scalability. Our parallel program can reach a speedup of 6.095 and strong scalability efficiency of 38.1% on 1024 CPU cores.
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图 3 LDMOSFET的输入输出键合线的几何结构尺寸与模型
Figure 3. Photo and geometry of LDMOSFET with input and output bonding wire arrays
图 4 JEMS-CDS-System软件计算键合线温度分布图与形变计算结果
Figure 4. Distribution of temperature and displacement with JEMS-CDS-System
图 5 JEMS-CDS-System软件最高温度、最大应力计算结果与商业软件COMSOL计算结果对比
Figure 5. Comparison between JEMS-CDS-System software and COMSOL results of maximum temperature and maximum stress
图 6 SiP结构模型与并行计算进程划分
Figure 6. SiP structure model and parallel computing process division
图 7 基于JEMS-CDS-System的温度分布与范式等效应力分布计算结果
Figure 7. Distribution of temperature and distribution of von Mises stress with JEMS-CDS-System
表 1 验证性并行计算相关参数
Table 1. Parallel scalability of the proposed simulation
number of CPU cores time of one step/s speedup efficiency/% 64 1035.0 1× 100 128 718.2 1.265× 72.1 256 486.4 2.128× 53.2 512 259.9 3.982× 49.8 1024 169.8 6.095× 38.1 
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