You can visualize the simulation results of the Fluid participant using ParaView and loading the (empty) file fluid-openfoam/fluid-openfoam.foam . The rigid body does not generate any readable output files, but the OpenFOAM data should be enough for now: click “play” in ParaView, the flap should already be moving!
Hi @Makis, thanks for getting back. Indeed, I do not know how to use ParaView but this tutorial along with your explanation solves the problem. If the link to the video tutorial is included in Quickstart, it would help others, too. Thanks again, Thomas