*2.4. Numerical Procedure*

(1) Pre-process. A 3D modeling software is employed to draw a geometry. Hexahedron structure meshes of the geometry are created by the Integrated Computer Engineering and Manufacturing (ICEM) and are shown in Figure 2. There are 6,433,548 grids, including 1,477,213 for the mixture fluid and 4,956,335 for the refractory.


**Figure 3.** Locations of 5 faces and 6 lines in the main trough for post-processing analysis: (**a**) planes in the full main trough, (**b**) lines in the mixture fluid of the main trough.
