The problem of potential flows in an elliptical area with a circular central hole was solved by the substitution of similar flows in this paper.
本文利用相似流动替换方法，解决了中心有圆孔的椭圆形区域内的位势流动问题；采用分区域解法，给出了中心有椭圆孔的椭圆形区域内位势流动问题的解析通解。
The general analytic solution for the potential flow in an elliptical area with a coaxial elliptical hole was found by combining similar flow substitution and flow area division.
采用分区域解法，给出了中心有椭圆孔的椭圆形区域内位势流动问题的解析通解。
Download this brushed metal texture and select Elliptical Marquee Tool to select the circle area.
下载这个拉丝金属质感，并选择椭圆选框工具，选择圆的面积。
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