Honors College Thesis
 

Direct Numerical Simulation of Anisotropic Particles in Turbulent Flow

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https://ir.library.oregonstate.edu/concern/honors_college_theses/xp68kp83v

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  • Turbulent flows with suspended, non-spherical particles are common in many natural and industrial processes. To identify the effects of anisotropic geometry on particle dynamics, a one-way coupled Lagrangian direct numerical simulation solver was written, verified, and used to collect data on particles simulated in multiple flows. This thesis explains the methods used to develop an anisotropic particle flow solver and explores the behaviors of the simulated particles. The dynamics of prolate ellipsoidal particles with aspect ratios between 1.001 and 25 were simulated in two-dimensional laminar Taylor-Green vortex flow and in a three-dimensional turbulent flow. During these simulations particle mass and particle density were held constant. The following major trends were identified through simulation. In the laminar case, the particles tended to orient in the stream wise direction and settling orientation speed correlated with higher aspect ratios. The laminar case also showed minor change in translational velocity with changing aspect ratio. Particles with lower aspect ratios tended to have a lower average difference between the particle and fluid velocity. The three-dimensional turbulent flow showed that ellipsoidal particles quickly disperse based on aspect ratio but supports the same conclusions as the laminar two-dimensional case where rounder particles are traversed the domain faster.
  • Key Words: Anisotropic particles, Fibers, Preferential orientation, Ellipsoid
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