Workbench allows you to add custom templates and includes some pre-defined custom templates. To use a custom template, double-click the template to add it to the Project Schematic.
Under Custom Systems in the Toolbox, there
is a predefined Fluent-based custom system (FSI: Fluid
Flow (Fluent) 
Static Structural – the
single arrow is meant to convey that the interaction is one-way).
When you double-click the template to add it to the Project
Schematic, Workbench automatically creates a link between
the Geometry cell in the Fluent system
and the Geometry cell in the Structural system and between the Solution cell in the Fluent system and the Setup cell in the Structural system.
You can create your own system template and then save it as a Custom System by performing the following steps:
Manually create the desired system diagram in the Project Schematic.
Right-click the white space in the Project Schematic and select Add to Custom from the context menu.
Important: When you use Fluent to perform a one-way fluid-structure interaction (FSI) analysis using the approach demonstrated in the predefined Fluent-based custom system, you can only exchange surface data for force and thermal loads.
Important: When you use Fluent to perform a one-way fluid-structure interaction (FSI) analysis using the approach demonstrated in the predefined Fluent-based custom system, and you are performing a multiphase simulation in Fluent, you cannot exchange thermal load data.