the problem specification is-

there is a cubical cavity with two isothermal faces and the remaining four sides having a linear temperature distribution. the cavity is heating from below. my problem is - how to apply the linear temperature distribution boundary conditions for the four side walls?

pls help me. i will be very much grateful.

use a table or some user code

The flow inside the cavity usually changes the linear profile. So it is better to model the heat conduction together with the fluid flow --> conjugate heat transfer.

Thanks Ben and Blake for ur help