虚拟网格为紧贴物面的面网格，它的作用是将物面边界条件传递给其它网格的边界面，而其本身不作流场计算。
The main purpose of the virtual grid is to convert a solid wall boundary condition into an interface condition while no fluid flow computations are conducted within the virtual grid.
利用曲面网格的边界曲线直接定义3D曲面，既能保证曲面的光滑过渡，即C1连续，又可避免通过确定扭矢来达到控制曲面的复杂计算。
The 3D surface can be defined directly by the boundary curve of the patch surface. The surface will be C1 continuous if the boundary curves connecting each two patches are C1 continuous.
不过，SOE的当前状态不能解决网格中跨管辖边界的治理问题。
However, the current state of SOE doesn't address the issues of governance having cross-jurisdictional boundaries in a grid.
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