$Boundary
$Boundary or $ThermalBoundary are the same commands. This command setup the thermal boundary of 3D thermal solver. The format is
$Boundary N_surface_number Surface_No_1 Surface_type Surface_value Surface_No_1 Surface_type Surface_value Surface_No_1 Surface_type Surface_value Surface_No_1 Surface_type Surface_value ..... ..... repeat N_surface_number