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[Sahil Sura]

Hi Jack Cool!
I appreciate your choice of approach, it is referred to as “Sub-Modeling”.  It is not only efficient but also it is computationally less expensive. 
Let’s imagine a case of two plates joined in a ‘T’ shape, subjected to thermal loading. If I used the sub-modeling approach for the ‘I’ part and added fixed support to the end to replicate the restriction of expansion in the longitudinal/ axial direction, would it also restrict the expansion in the transverse direction for the face? and if so would the results be accurate?

You might want to consider as mentioned various displacement and other constraints to add to the bulkhead for simulation. If it’s some frictionless or compression-only support you’re adding and the model isn’t constrained in any of the directions, you can consider the option of including “Weak Springs” in the analysis.

Please find the following references which will help you in choosing an appropriate boundary condition and also guidance on sub modeling – 
Support Type Boundary Conditions (ansys.com)
https://ansyshelp.ansys.com/Views/Secured/corp/v232/en/wb_sim/ds_Support_Types.html
Performing Submodeling in Ansys Mechanical — Lesson 6 – ANSYS Innovation Courses
Deploying an Efficient Sub-Modeling Strategy with Ansys Simulation Solutions | Ansys

 

Hope this helps!

Thanks,

Sahil

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