Bulletin of the American Physical Society
74th Annual Meeting of the APS Division of Fluid Dynamics
Volume 66, Number 17
Sunday–Tuesday, November 21–23, 2021; Phoenix Convention Center, Phoenix, Arizona
Session F12: Particle-laden Flows: Particle-Resolved Simulations
5:25 PM–6:43 PM,
Sunday, November 21, 2021
Room: North 126 ABC
Chair: Gustaaf Jacobs, San Diego State University
Abstract: F12.00003 : Particle-laden flows around a circular obstacle: numerical simulations of the wake instability.*
5:51 PM–6:04 PM
(Institut de Mécanique des Fluides, Toulouse - France)
(Friedrich-Alexander-Universitat Erlangen-Nurnberg, Germany)
Our numerical approach is fully-coupled, such that fluid-particles (10 grid cells per particle diameter) and particle-particle interactions (discrete element model of collisions and friction) plus the feedback effect of particles on the fluid flow are resolved. The simulations of suspension flows are based on modern simulation methods to generate highly efficient and scalable Lattice Boltzmann Method calculations. The code used for this study is waLBerla, an open-source C++ multiphysics software framework, which was designed for high-performance computing on massively parallel clusters. Simulations of particle resolved dynamics with up to 4,800 million grid cells and 1.8 million spherical particles are carried out for different flow regimes and particle concentrations from dilute (5%) to semi-dilute regime (20% volume concentration).
The flow response is described by characteristic parameters such as dimensionless vortex shedding or wake recirculation length. Flow regimes with neutrally-buoyant particles can be rationalized by means of mixture material properties while we observe a progressive transition to granular flow for inertial particles. Drag and lift forces acting onto the cylinder are commented. and the physical analysis is based on the respective hydrodynamic and particle collision contributions.
*Acknowledgement to CALMIP/GENCI for CPU resources.
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