Ansys FAQ -- CFD-Wiki, the free CFD reference 2 Write an Ansys Input File ( inp) of this setup 3 Define the Fluid setup in Ansys CFX-Pre A link to the Ansys Input File is required 4 Write an Ansys Definition File ( def) of this setup from CFX Pre 5 Start the coupled FSI run with the CFX Solver Manger 6 Postprocess both the CFD and solids results in CFX-Post