To complete your analysis, you work downward through each cell in order. In general, data flows downstream (from top-to-bottom within systems and from left-to-right across systems). Output data from upstream component cells is provided as the input data for downstream cells. Output data from certain types of cells in one system can also be transferred and/or shared with cells in another system.
The following example shows two systems in the Project Schematic, a Fluid Flow (Fluent) system (system A) and a Static Structural system (system B).

The geometry from the Geometry cell in system A becomes the input for the Mesh cell of system A. The mesh generated in the Mesh cell of system A, in turn, becomes input to the downstream Setup cell of system A, and so on.
Data also flows between system A and system B. These two systems share the same geometry, as indicated by the blue link with the square terminator between the Geometry cell in system A and the Geometry cell in system B.
Solution data from System A is provided to the Setup cell of system B, as indicated by the fuchsia connector with the round terminator.
At a glance, you can see the data relationship between the two types of analysis systems.