为方便后面声场的计算和对称边界条件的实施，选用重叠网格。
Overlap grid is selected for helping calculate aeroacoustics following and apply symmetrical boundary condition.
具体推导了柱坐标下的有限元列式，并给出了周期对称边界条件的处理方法。
FEM formula in the cylindrical coordinates system is derived and the methods of dealing with the periodic symmetric boundary coordinates are given.
本文给出了一种从额外维度模型出发，通过边界条件的定义建立对称破缺机制的简单方法。
This article shows up a simple method of symmetry breaking mechanism which embark from the extra dimensional model and through boundary condition definition.
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