This diagram shows the geometric configuration, coordinate directions, and boundary conditions used for the two-zone flat plate example case.

Zone 1, on the left, is 25 by 65 by 3, and zone 2, on the right, is 49 by 65 by 3. The rightmost boundary of zone 1 is coupled to the leftmost boundary of zone 2. The origin is at the lower-left corner of zone 1, with the x direction and i index directed to the right, and the y direction and i index directed up.

The zone boundaries are labeled with the boundary condition used there, as follows.

Boundary		Boundary Condition
Zone 1, left		Inflow
Zone 1, bottom		Symmetry
Zone 1, top		Outflow
Zone 2, bottom		Solid wall
Zone 2, top		Outflow
Zone 2, right		Outflow