initial section

In this thesis, the multi-dimensional Riemann problems are discussed, inwhich initial discontinuity is a sphere.

本文研究初始间断为球面的高维黎曼问题。

The convergence was improved using pseudo material properties to get apreliminary shape,and then the real properties to get the final shape.

首先从投影面开始提升控制点到指定位置而得到找形曲面,在此过程中为保证收敛的实现采用虚假的弹性模量从而得到一初始曲面,接着输入真实的弹性模量而得到最终的曲面,由此提出了二次找形的概念。