Learning Forum

[UNI]

https://innovationspace.ansys.com/courses/courses/radiation-in-heat-transfer/lessons/homework-quizzes-simulation-examples-radiation/

-> The file for the second problem is available at the link, so I would appreciate it if you could refer to it for the other boundary conditions.

In Ansys Steady-State Thermal analysis, when a Temperature boundary condition is applied at the body level, the ‘Apply to’ option provides two choices: ‘Exterior Faces Only’ and ‘Entire Body’.

When selecting ‘Exterior Faces Only’, I would like to understand which faces of the body the temperature is actually applied to.

Additionally, in my current analysis, when I applied a convection boundary condition to some surfaces of a body that was set with ‘Exterior Faces Only’, those surfaces did not maintain the prescribed temperature.

In this regard, I would like to know whether there is any internal priority or handling mechanism between boundary conditions in Ansys.

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Exterior Faces Only Result

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Entire Body Result

 

[Armin]

Hello,

If you assign a convection boundary condition to a specific face and also have a temperature condition set with ‘Exterior Faces Only’, the face-specific condition (convection) will take precedence on that face. The temperature condition will only apply to exterior faces that do not have another, higher-priority condition directly assigned.

This means that if you see a face with convection not maintaining the prescribed temperature, it is because the convection condition is taking effect on that face. For more details, refer to the Ansys Mechanical documentation on resolving thermal boundary condition conflicts:
17.8. Resolving Thermal Boundary Condition Conflicts

[UNI]

 

Thank you for your response!
After reviewing the material you provided and conducting some tests in Ansys, I would like to confirm my understanding.

If we consider a solid body and apply various boundary conditions, would it be reasonable to interpret the relative precedence (or influence) of boundary conditions on a specific face in the following order?

Temperature (Surface) > Temperature (Entire Body) > Convection (Face) > Temperature (Exterior Faces Only) > Convection (Body)

I would appreciate your clarification on whether this interpretation is correct.

 

[UNI]

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