Direct Numerical Simulation of Particle Transport and Dispersion in Wall-Bounded Turbulent Flows
[Technical Report, Technical Report]
US Army Combat Capabilities Development Command, Army Research Laboratory
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The multiphase wall-bounded turbulence resolving capabilities of particle-laden flows via immersed boundaries PARTIES, an academic in-house particle-resolving direct numerical simulation code Biegert et al. 2017 Vowinckel et al. 2019 is validated against Picano et al. 2015. Particle-turbulence interactions in wall-bounded flows is a problem of great importance in order to predict particle transport, aggregation, and deposition for a broad range of engineering applications. In this work, four simulations of turbulent channel flow of dense suspensions are performed. The suspensions comprise neutrally buoyant particles immersed in a Newtonian fluid with volume fractions of phi 0,0.05,0.1,0.2. Coupling between the fluid and solid phases is achieved by the Immersed Boundary Method. The mean streamwise fluid velocity, local solid volume fraction, and solid-phase velocity are examined and found to be in good agreement with reference data. PARTIES appears to slightly underestimate the wall shear stress, which may be attributed to a discrepancy in the applied pressure gradient and Reynolds number. Despite the small inconsistencies, PARTIES successfully captures the relevant internal flow physics reported by Picano et al. 2015 and is a promising tool to study particle-laden systems of relevance to the Army.
- Fluid Mechanics