Hi Nagarajan D
There doesn't seem to be a need to add thermal physics after structural, considering that you are working with a manifold. Generally for such applications, pressure from fluid and temperature distribution from thermal are provided as inputs to structural analysis.
This can be done by, using the Fluid-Solid Heat Transfer template of Discovery AIM
Please make sure to select both options under additional physics in order to incorporate thermal as well pressure effects in structural analysis.
The solver will first solve the flow part for pressure and temperature distributions and these will then be used as imported values to structural analysis and the workflow will look like this:
Though there is no separate thermal tab, but all required thermal inputs can be provided using "Solid Thermal conditions" under Flow tab itself. Also, the temperature distribution will be available under Flow results.
I hope this answers your query.
Thanks & Regards,