回复： 【讨论】请教两个辐射面辐射方向的问题
你用的什么方法：是matrix，还是radiosity1、如果是matrix，则看：
The orientation of the superimposed elements is important. The AUX12 Radiation Matrix Generator assumes that the "viewing" direction (that is, the direction of radiation) is along +Ze for SHELL57 elements and along +Ye for LINK32 elements (where e denotes the outward normal direction of the element coordinate system). Therefore, you must mesh the superimposed elements so that the radiation occurs from (or to) the proper face. The order in which the element's nodes are defined controls the element orientation。如果想改变缺省单元坐标系，esys即可
可以用/PNUM查看辐射方向是否有误
2、如果是radiosity，则看：
To apply radiation surface loads on the SHELL57 or SHELL157 elements, you must specify the face number with the exterior or interior orientation to properly flag it.
如果是141，142单元，则看：
If Lab = RDSF, VALUE2 is the enclosure number. Radiation will occur between surfaces flagged with the same enclosure numbers. If the enclosure is open, radiation will also ocurr to ambient. If VALUE2 is negative radiation direction is reversed and will occur inside the element for the flagged radiation surfaces. Negative value of enclosure number is applicable for FLUID141 and FLUID142 elements, to model radiation occurring between surfaces inside the fluid domain.
如果是其他单元，则应该是单元外法线方向
具体帮助说得很清楚
不过我估计你的问题不用搞这么麻烦
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