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[求助] RF模块的“unT”和“dnT”的区别在哪里?

RF模块的“unT”和“dnT”的区别在哪里?
链接是Comsol官网论坛的结果,但是看了半天还是不大懂,求高人指点:http://cn.comsol.com/community/forums/general/thread/35998
另截屏如下,麻烦知道的指点迷津,THX!
August 7, 2014 7:38am HKT        in response to Sergei Yushanov
Re: Maxwell Stress Tensor



Yes, the difference between upward and downward stress tensor is related to the direction of the surface normal.

Regards,
Sergei


I am writing after more than a year in this thread, but I hope someone can help clarify this point. I guess the difference between downward and upward is more than just outwards and inwards with respect to the surface, as mf.unTx+mf.dnTx for instance is not necessarily zero. My understanding is that it could be that upward is the stress tensor "just above" a surface (boundary) and downward is the same "just below" the boundary. Is this correct?

Thank you!
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