环形区域 meaning in English

annular area
annular region

For the first category, we consider the boundary flow as an annular zone completely isolated from mixing with the main flow environment .
对于第一个范畴，我们把边界看作是完全隔离的环形区域，并不与主流环境相混合。
Finally we will get a 2 - dimensional manifold mesh . the algorithm works well for models with arbitrary topology and can tolerate the sampling noise at some degree
具体的局部算法包括局部过滤、局部重建和环形区域填补，它们分别用在不同的情况下对网格进行修正。
At first the background and significance of the work are mainly introduced , as well as the concept and type of thermal storage . then the thermal performance of the unit is measured and heat transfer characteristics of melting process of stearic acid is studied under different heat flux conditions to determine the influence of heat flux on the melting process
首先主要说明了课题研究的背景和意义、介绍了贮能技术的概念与分类，国内外相变蓄热研究的进展与状况；其次对第二类边界条件下环形区域内硬脂酸融化问题进行了实验研究。