热耦合问题
我做了摩擦生热的东西，后来想加上对流和热辐射，主要添加了以下三个关键字：*SET_SEGMENT
1 0.000 0.000 0.000 0.000
15670 15648 17595 9320 0.000 0.000 0.000 0.000
9320 17595 17596 9321 0.000 0.000 0.000 0.000
......................
BOUNDARY_RADIATION_SET
2
4 1.0 5 1.0 1
*BOUNDARY_CONVECTION_SET
2
6 0.3 7 1.0 1
运算后出现了这个错误，
*** Error - the solution has a non-positive definite
stiffnes matrix in the first time step
1) try equation solver 1
2) check that the model has a boundary condition
that forces is out of equilibrium
不知怎样解决，哪位感兴趣给指点指点。或者互相探讨。
我得QQ:154248326
我可义共享K文件
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