多介质拉氏自适应流体动力学软件LAD2D研制及其应用

拉氏方法是内爆动力学过程数值模拟的主要方法.针对高温、高压、多介质和大变形等内爆问题,采用非结构任意多边形网格底层管理、计算过程中网格邻域可变技术,以及拉氏自适应网格加密方法和层次化、模块化程序设计思想,自主研发非结构拉氏自适应网格流体动力学软件LAD2D.从物理模型、计算方法、程序设计、程序验证与确认、大变形问题数值模拟等方面系统地介绍LAD2D.LAD2D对多介质爆轰弹塑性流体大变形问题有很强的适应能力.

Development and application of adaptive multi media Lagrangian fluid dynamics software LAD2D

Lagrangian method is the main approach for numerical simulation of implosion dynamics. As to the implosion problems of high temperature, high pressure, multi media and large deformation, the adaptive unstructured Lagrangian mesh fluid dynamics software LAD2D is researched and developed independently using the means such as underlying management of unstructured arbitrary polygon meshes, variable neighborhood mesh technology in calculation process, adaptive Lagrangian mesh refinement method, hierarchical and modular program design ideas and so on. Many aspects on LAD2D, including physical model, calculation method, program design and verification and validation, numerical simulation for the large deformation problems and so on, are systematically introduced. LAD2D is better adaptive for the multi media detonation elastoplastic large deformation fluid problems.