基于ALE的矿粉货物液化晃荡问题并行数值模拟

含水量较高的矿粉货物在海上运输过程中易出现液化,形成自由表面并使晃荡现象加剧,严重威胁船舶运输安全。针对船载液化矿粉晃动和舱壁冲击问题,采用ALE有限元方法对其进行了细致建模和计算模拟,从三维角度考察了在船舱一定装载率和运动状态下液化矿粉的晃荡现象和特性;同时,借助不同仿真软件,对计算结果的合理性和准确性进行了相互比对和分析。模型求解借助了高性能计算资源,以解决问题求解时间长和多组计算工况带来的大规模计算需求;结合所建计算模型特点和流固耦合特性,研究了多核环境下两种不同区域分解策略和实现方式,通过并行计算性能数据比较分析,以探求更为合理的并行加速策略。

ALE-based parallel numerical simulation for sloshing problem of liquefied ore fines cargo

Ore fines cargo with high moisture content is liable to liquefaction, making free surface emerg-ing and intensifying sloshing behavior, and finally pose a threat to marine transportation security. With the benefit of Arbitrary Lagrangian-Eulerian (ALE) finite element method, detailed modeling and refined sim-ulation were implemented to deal with shipping liquefied ore fines sloshing problem, and to investigate three-dimensional sloshing phenomena and characteristics with certain charging ratio and motion state. Two different numerical nodes were used to make comparison and analysis for rationality and accuracy of results. High-performance computing (HPC) resource was utilized to meet the challenge of large scale com-puting requirement due to time-consuming solving and load cases. In view of model size and fluid-structure intersection property, two domain decomposition plans were proposed to better improve load balance for multicore processors, and compared with parallel performance data to determine more reasonable parallel acceleration strategy.