A particle-resolved direct-numerical simulation study of particle-laden turbulent channel flow using a massively parallel, unstructured, overset method

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Abstract

Particle-laden, turbulent fluid flows often feature a large range of length scales spanning from large convective scales down to scales below that of individual particles. Particle-resolved direct-numerical simulations (PR-DNS) seek to resolve all scales present in particle-laden flow using first principal approaches Tenneti & Subramaniam (2014). Resolving the fluid features at and below that of individual particles for cases with many, moving particles presents difficult numerical challenges. In this work, unstructured meshes are attached to moving particles and placed within a fixed background domain. A dynamic overset assembly calculation is performed to connect the fluid flow solutions between the overlapping meshes. An incompressible, high-resolution, finite-volume method is used to solve for the fluid flow. Particle hydrodynamic forces are directly integrated along particle surfaces to provide rigid-body motion. The method scales to large numbers of particles, O(10,000-100,000), while also providing high resolution near the particle surfaces and solid boundaries of the domain. Using this approach, simulations of particle-laden channel flow are performed. Inertial particles are selected which can exhibit non-trivial particle slip-velocity near the channel walls Li et al. (2001b). Flow and particle statistics and flow fields are presented for the case of 10,000 and 50,000 particles in Re = 180 channel flow.

Original languageEnglish (US)
StatePublished - Jan 1 2019
Event11th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2019 - Southampton, United Kingdom
Duration: Jul 30 2019Aug 2 2019

Conference

Conference11th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2019
CountryUnited Kingdom
CitySouthampton
Period7/30/198/2/19

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Horne, W., & Mahesh, K. (2019). A particle-resolved direct-numerical simulation study of particle-laden turbulent channel flow using a massively parallel, unstructured, overset method. Paper presented at 11th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2019, Southampton, United Kingdom.