OpenHFDIB-DEM: Solids Movement Modes

For the 21st OpenFOAM Workshop, held in Guimarães in 2026, we prepared a short course introducing our open-source CFD-DEM framework, OpenHFDIB-DEM. This video is the third in the series and focuses on the movement modes available for solid bodies in OpenHFDIB-DEM. Understanding these modes is essential for selecting the appropriate level of fluid-solid interaction and for configuring simulations ranging from fixed obstacles to fully resolved particle dynamics. Starting from simple examples, we demonstrate how to configure solids with different levels of mobility and discuss the implications of each approach for CFD-DEM simulations. Topics covered in this video: • Static (immovable) solid bodies • Prescribed translational motion • Prescribed rotational motion • Combined translational and rotational movement • Fully coupled solids driven solely by external forces and torques • Selecting the appropriate movement mode for a given application • Practical examples and simulation setup considerations In addition, this video introduces the *bodiesInfo* folder for the first time in the series. This directory is automatically generated during simulation runtime and contains detailed information about individual solid bodies, including their positions, velocities, orientations, and other relevant quantities. Understanding the structure and contents of this folder is important for monitoring simulations and performing subsequent data analysis. By the end of the tutorial, viewers will understand how to configure the different movement modes available in OpenHFDIB-DEM and how to access runtime information about individual solids through the generated output files. OpenHFDIB-DEM repository: https://github.com/techMathGroup/open... Course playlist:    • OpenHFDIB-DEM   Course repository: https://github.com/techMathGroup/open... Laboratory webpage: https://techmathgroup.isoz.eu/ Workshop: 21st OpenFOAM Workshop, Guimarães, Portugal (2026) The course materials are based on the continuously developed open-source framework used in academic research and engineering applications involving fluid-particle interactions, particulate flows, and immersed boundary methods. If you find the course useful, consider starring the GitHub repository and subscribing for future tutorials and updates.