Transient growth in turbulent particle-laden channel flow
| Autor: | Lili Wang, Wei-Xi Huang, Yang Song, Chun-Xiao Xu |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Physics
Turbulence Mechanical Engineering Computational Mechanics Direct numerical simulation Reynolds number Laminar flow 02 engineering and technology Mechanics 01 natural sciences 010305 fluids & plasmas Open-channel flow Physics::Fluid Dynamics symbols.namesake 020401 chemical engineering 0103 physical sciences symbols Fluid dynamics Particle 0204 chemical engineering Current (fluid) |
| Zdroj: | Acta Mechanica Sinica. 36:1-11 |
| ISSN: | 1614-3116 0567-7718 |
| DOI: | 10.1007/s10409-019-00902-w |
| Popis: | Linear transient growth of optimal perturbations in particle-laden turbulent channel flow is investigated in this work. The problem is formulated in the framework of a Eulerian–Eulerian approach, employing two-way coupling between fine particles and fluid flow. The model is first validated in laminar cases, after which the transient growth of coherent perturbations in turbulent channel flow is investigated, where the mean particle concentration distribution is obtained by direct numerical simulation. It is shown that the optimal small-scale structures for particles are streamwise streaks just below the optimal streamwise velocity streaks, as was previously found in numerical simulations of particle-laden channel flow. This indicates that the optimal growth of perturbations is a dominant mechanism for the distribution of particles in the near-wall region. The current study also considers the transient growth of small- and large-scale perturbations at relatively high Reynolds numbers, which reveals that the optimal large-scale structures for particles are in the near-wall region while the optimal large-scale structures for fluid enter the outer region. |
| Databáze: | OpenAIRE |
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