Approach 2 using Temperature Dependent material properties is the correct approach. With a high constant thermal conductivity, heat can more easily move from the inner surface to the outer surface, resulting in a higher temperature. With the thermal conductivity dropping through the thickness with temperature, heat flows to the outer surface more slowly allowing the convection to cool the surface to a lower temperature. Yes, ANSYS wil interpolate for values between 400 C and 600 C. If you have thermal conductivity data below 400 C, it would be better to add some lower temperatures into your material model, all the way down to 20 C if you have it because with no data below 400 C, it just uses the last value in the table for all temperatures below 400 C.
Steady State Thermal is the correct analysis to run.Â
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