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Visually Based Characterization of the Incipient Particle Motion in Regular Substrates: From Laminar to Turbulent Conditions
Published on: February 22, 2018
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Exact regularized point particle (ERPP) method for particle-laden wall-bounded flows in the two-way coupling regime.
F Battista1, J-P Mollicone2, P Gualtieri3
1ENEA, Italian Agency for New Technologies, Energy and Sustainable Economic Development, via Anguillarese 301, 00123 Rome, Italy.
Journal of Fluid Mechanics
|September 4, 2020
Summary
The Exact Regularized Point Particle (ERPP) method now models particle-wall interactions, showing particles near walls increase drag by generating vorticity. This enhanced method simulates particle-laden flows, crucial for understanding turbulence modulation.
Area of Science:
- Fluid Dynamics
- Computational Physics
- Particle-laden flows
Background:
- Accurate modeling of particle-fluid interactions near walls is essential for understanding turbulence modulation.
- Existing methods struggle with complex particle distributions and parameter ranges.
Purpose of the Study:
- To extend the Exact Regularized Point Particle (ERPP) method for improved simulation of particle-fluid momentum coupling near solid boundaries.
- To investigate turbulence modulation in particle-laden turbulent pipe flow.
Main Methods:
- Enhanced Exact Regularized Point Particle (ERPP) method incorporating particle-induced vorticity at walls.
- Direct numerical simulations of two-way coupled particle-laden turbulent pipe flow.
- Analysis of global impulse balance and momentum stress budget.
Main Results:
- The enhanced ERPP method accurately captures particle-induced vorticity near walls, a key factor in total impulse.
- Particles near walls were found to increase, not decrease, flow drag.
- Particle momentum stress significantly alters viscous stress, impacting drag behavior.
Conclusions:
- The enhanced ERPP method provides a robust framework for simulating particle-laden flows near walls.
- Particle-wall interactions, particularly vorticity generation, play a critical role in drag and turbulence modulation.
- The study clarifies drag behavior in particle-laden flows, finding no drag reduction within the investigated parameter space.
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