Hi,
For thermal analysis, by default, for shell elements, we cannot give different temperatures for top and bottom (i.e. temperature is constant throughout the thickness of the shell). But, this can be done by changing keyoptions of the shell131 element which indirectly creates two new dofs (say for a shell of 1 layer) TTOP & TBOT. Then further commands are necessary to apply temperatures on these newly created dofs via D command (say, D,all,TTOP,100 - applies temperature of 100 on all nodes of the top surface).
Also, this can be done in Mechanical as well: How can we apply different loading conditions on both the top and bottom of a shell/surface body, e.g., temperature on top face and convection on bottom face. - Ansys Knowledge
Please see if this helps.
Regards,
Ashish Khemka
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