[建模]CST EMS高压开关仿真  关于选择boundary condition和background material的问题

sf6材料设定没问题 LN?T$H  
但是边界的话 罐子是放在室内或者室外的（室内的话空间也远大于罐子本身，所以我也认为应该属于open）但是我设置open的话 在运行仿真时会说我边界无效 自动改成tengential，我不是很明白什么原因。还想知道下open， open add space，tengential，electric之间的区别

EMS的帮助文件已经把每种边界的功能和适用条件说得挺清楚了，我不知道为什么楼主还是“没看出个所以然”。 U)c,ZxE  

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Open: Operates like free space. This boundary condition type is available for the hexahedral electrostatic, magnetostatic  and thermal solvers. t,=khZ  
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Open (add space lf): Similar to the open boundary condition, with some extra space added between structure and applied boundary condition. This boundary condition type is available for the hexahedral electrostatic, magnetostatic  and thermal solvers. jUjQ{eT  
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Tangential: Forces the normal components of the electric, magnetic or current field (depending on your application) to be zero at the boundary.  For all magnetostatic or magnetoquasistatic applications tangential boundary conditions correspond to electric boundary conditions. For all electrostatic or electroquasistatic applications they correspond to magnetic boundary conditions. This boundary condition type  is available for the electrostatic, magnetostatic stationary current and thermal solver. $=H\#e)]Ug  
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Electric: Operates like a perfect electric conductor, where the tangential components of electric fields and the normal components of magnetic fluxes are zero. This means that electric fields are normal to the boundary and magnetic fluxes are parallel to the boundary. For all magnetostatic or magnetoquasistatic applications electric boundary conditions correspond to tangential boundary conditions. For all electrostatic or electroquasistatic applications they correspond to normal boundary conditions. This boundary condition type is available for all EMS solvers. 'z+8;g.ekO  
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CST EMS帮助文件《Boundary Conditions - Boundaries》。 r[~Km5  
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如果楼主耐心阅读EMS帮助文件里每个Solver的Overview，每个文件里都有Boundary的说明。楼主你之前的描述从来没有说明过“在选择open和open add space都会自动跳到tengential去”这种情况发生在使用哪个solver的情况下（electrostitic solver或low frequency solver）。（楼主也不说清楚是哪个Low Frequency Solver） lDAw0 C3  
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CST EMS帮助文件《Electrostatic Solver Overview》： &WsDYov?  
The electrostatic solver features open boundary conditions. These help to reduce the number of mesh nodes, when problems in free space are simulated. G]5'U"cj3  
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CST EMS帮助文件《LF Frequency Domain Solver Overview》： h^[K= J  
Currently the LF frequency domain solver does not support open boundaries. Vl'|l)b4W  
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CST EMS帮助文件《LF Time Domain Solver (MQS) Overview》： lfWxdi  
Currently the magnetoquasistatic solver does not support open boundary conditions.

我搞不清楚你到底要模拟什么地方的场？难道封闭开关外部的场你也关心吗？罐体材料内部的场你也关心吗？ 3(6i6 vV  
其实你不就是关心开关里六氟化硫气体环境中的场分布嘛。所以你的计算边界就是PEC就OK了，别Open了，那应该不是你关心的地方。

因为罐式sf6的高压开关上半部分是套管 这部分的内部沿面和外部沿面场强都是我要关心的

谢谢斑竹的回复～～ 相当感激

我看好看到你们的帖子，我现在正在做跟以上你们讨论的有点类，但是我是菜鸟，我想问下background material 和boundary conditions 在同一个计算里面都要设置的，还是只需要这只一个？ 4-ZiKM  
还有就是那个开关是中空的，然后罐头在最外层， 为什么楼主建议罐头也要建模？可不可以开关建模然后设置background material 为normal就是空气，，，可不可以呢？ 我不是很懂这方面的，所以想找你们探讨一下，，，主要我的模型跟你们讨论的很相似，也是中空，然后充满sf6 外围是个罐头，，，， <LzN/I aJ  
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希望有人回帖。。。拜托了