An efficient implementation of four-way coupled particle-laden flow in high-order discontinuous Galerkin schemes
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Compressible flows with suspended particles occur in a wide variety of applications, e.g., human pathogen transport or aeronautical engineering. As many of these applications can be categorized as dilute gas-particle flows, the common working assumption is that inter-particle collisions are negligible compared to the fluid-particle interaction. While this assumption is often fulfilled when considering the average of the flow field, especially near-wall regions often see a local enhancement of the particle number density. In this talk, we present the extension of our high-order accurate massively parallel Discontinuous Galerkin Spectral Element Method (DGSEM) framework towards four-way coupled particle-laden flows. The framework has been previously applied to wall-resolved LES of high-Reynolds number turbulent flows with one- and two-way coupled dispersed particulate phase, delivering accurate results while maintaining excellent scaling up to tens of thousands cores. Particle pairing is achieved using dynamic mesh refinement and subsequent nearest neighbor search, following an approach previously applied towards reactive plasma flows. Special care is taken to retain the scaling properties during this particle collision phase. This work concludes by presenting examples of large scale computations for dense particle-laden flows in complex systems and giving an outlook on the next research challenges.
