Hi, I have to model a transient thermal problem in Ansys. I just need an outline of how I should proceed. The Problem: I am trying to model the cooling of a solar collector reciever tube from 150 degree celsius to ambient. My attempts have involved the following: 1. Initial condition of 423 at the inner dia of the circle 2. Convection Boundary condition (film coefficient of 25 and bulk temp of 298) at the outer dia of the circle It is not displaying the results properly (or I am reading them wrong). It shows the entire system at 298 apparently all the time. Are these conditions sufficient to constitute a solution in Ansys? What else am i doing wrong or I need to do? Thanks in advance.