Hi Aleksandr,
It is not due to incorrect simulation settings. The air section is not included in the temperature map because it is a fluid. Fluids in the HEAT solver are only used to enforce boundary conditions. The heat transfer equations are solved only in the solids based on the boundary conditions defined at the solid-fluid interfaces, which specifically includes convection at the boundaries.
More information on fluids can be found on the following page:
https://optics.ansys.com/hc/en-us/articles/360034919173-Fluid-material-model-properties
Please let me know if you have more questions.
Regards,
Amrita
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