通过对三维数值模拟实施过程中几何建模、接触、网格自适应和重划分等关键技术问题的处理，顺利完成传统方案和改进方案的模拟。
To continue the numerical simulations of the conventional and improved schemes, some key technologies, including geometric model, contact, mesh adapting and remeshing, are solved.
该方案首先将矩形地理空间进行租网格划分建立多级网格索引，然后针对每个小网格建立基于R树的空间索引。
A rectangular region of geography is roughly partitioned in several times to multilevel sub-regions, in which spatial index of R-tree has been constructed.
在对原模型进行结构网格划分后，通过数值模拟，分析了不同设计方案下叶轮内的压力、湍动能、速度分布，并预测了外特性，选取一个最优方案进行试验。
The distributions of pressure, turbulence kinetic energy, velocity in three impellers were predicted with the commercial CFX. One impeller was selected as optimal schemes and produced for experiments.
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