Mesh 1
As this tutorial is intended to explore the heat transfer modeling capabilities, define a coarse mesh to speed up the computation. Note however that for accurate results, a finer mesh is needed.
1
In the Model Builder window, select Mesh 1  and, in the Physics-Controlled Mesh section, choose Extremely coarse in the Element size list.
2
In the table, clear the Use checkbox for Geometric Analysis Detail Size.
3
In the Home toolbar, click Compute .