0603841 - ÚT 2025 eng A - Abstract
Kubíčková, Lucie - Studeník, Ondřej - Kotouč Šourek, M. - Isoz, Martin
Towards unsteady Reynolds-averaged simulation of particle laden flows: Initial adjustments of a direct forcing immersed boundary method.
[Multiphase Flow Conference & Short Course (MPF2024) /20./. 11.11.2024-15.11.2024, Drážďany]
R&D Projects: GA TA ČR(CZ) TN02000069
Institutional support: RVO:61388998
Keywords : unsteady RAS * immersed boundary method * CFD * OpenFOAM
OECD category: Applied mathematics

Two-fluid or high-fidelity models are not truly usable for large scale applications with resolved particle shapes, e.g., simulations of rocks moving over a river bed. A viable alternative is to combine high-fidelity models with phenomenological turbulence modeling while preserving the sharp phase interfaces. In this contribution, we work with our custom high-fidelity model for particle-laden flows, the hybrid fictitious domain-immersed boundary and discrete element method (HFDIB-DEM). The DEM part is used to describe arbitrarily shaped particles and track their movement when affected by fluid. Next, the HFDIB method is a variant of a direct forcing immersed boundary method. The included turbulence models were two-equations models based on Reynolds-averaging (RAS) with Boussinesque hypothesis. In particular, we implemented the k-ω, k-ε, k-ω SST and realizable k-ε models. The new HFDIB-RAS approach was tested on several verification and validation cases with static phase interface so that the results were comparable with standard simulation approaches with geometry conforming meshes.
Permanent Link: https://hdl.handle.net/11104/0361720