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Physics Setup
Set-up Initial Conditions
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We will need to run the steady state model and use the result as the initial condition for the transient analysis.
Right click on Steady-State Thermal (A5) > Insert > Temperature.
Select the entire Shell body and set the temperature to 22 degrees Celsius. Create another temperature boundary condition but select the Specimen instead. Set the temperature of the Specimen to -273.15 degrees Celsius.
Right click on Solution (A6) > Insert > Thermal > Temperature. The default geometry is set to All Bodies. Keep it and repeat the step but select only the Specimen.
The solution titled Temperature will display the temperature distribution of the shell and the specimen and Temperature 2 will display only the specimen. Notice there isn't any temperature variation because we have done nothing except setting set the temperature of the two bodies. No heat can be exchanged between the two bodies without specifying additional boundary conditions (convection, radiation, etc).
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Set-up Transient Thermal Analysis
Return to the Project Schematic in ANSYS Workbench. Right click on Solution > Transfer Data to New > Transient Thermal. This will export the model, the mesh, and the steady state solution to Transient Thermal analysis and the new analysis is ready to be set-up.
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Please go through the following video to specify the symmetry regions in the model. This will allow the FEA code to compute the View Factor between the surface of the shell and the specimen. The View Factor is an important parameter in radiation analysis.
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Once the Convection and Radiation boundary conditions have been set up, you may move on to the next step to set up the solution.
Go to Step 5: Numerical Solution