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Have you checked under the first condition that it is being overwritten by the second one?

Thank you for your answer. I checked and found that they coexisted. The first one was not overwritten by the second.

Hello 佳卉,

In the Heat Transfer in Solids interface, which is what I assume you are using, the default BC is Thermal Insultation on all boundaries. If you add a Temperature BC on one of the boundaries, you will see that that boundary's number will be marked as "(overridden)" on the Thermal Insulation settings window.

Please post your mph file if this does not resolve your doubts.

Best,

Jeff

Thank you for your answer. I understand what you mean. What I don't understand is that when I add "temperature" BC (Dirichlet condition) on a boundary, I can also add "flux" BC (Neumann condition) on this boundary. Their relationship is coexistence. I don't understand why these two boundary conditions can coexist.

Hello 佳卉,

I think I now understand your question. The section of the Reference Guide entitled "Physics Exclusive and Contributing Node Types" (on pages 172-173 in the documentation for v 6.0) addresses your question, especially the paragraph at the bottom of page 172 ("Order of exclusive and contributing nodes").

The Reference Guide can be accessed through File > Help > Documentation. Best,

Jeff

Thank you very much for your help. Now I understand this question by reading the help document.