Turbulence unsteadiness drives extreme clustering
Fuente:
arXiv
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| Autori principali: | , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| Soggetti: | |
| Accesso online: | |
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| _version_ | 1866910341618728960 |
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| author | Zapata, Florencia Angriman, Sofía Ferran, Amélie Cobelli, Pablo J. Obligado, Martin Mininni, Pablo D. |
| author_facet | Zapata, Florencia Angriman, Sofía Ferran, Amélie Cobelli, Pablo J. Obligado, Martin Mininni, Pablo D. |
| contents | We show that the unsteadiness of turbulence has a drastic effect on turbulence parameters and in particle cluster formation. To this end we use direct numerical simulations of particle laden flows with a steady forcing that generates an unsteady large-scale flow. Particle clustering correlates with the instantaneous Taylor-based flow Reynolds number, and anti-correlates with its instantaneous turbulent energy dissipation constant. A dimensional argument for these correlations is presented. In natural flows, unsteadiness can result in extreme particle clustering, which is stronger than the clustering expected from averaged inertial turbulence effects. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2402_15015 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Turbulence unsteadiness drives extreme clustering Zapata, Florencia Angriman, Sofía Ferran, Amélie Cobelli, Pablo J. Obligado, Martin Mininni, Pablo D. Fluid Dynamics We show that the unsteadiness of turbulence has a drastic effect on turbulence parameters and in particle cluster formation. To this end we use direct numerical simulations of particle laden flows with a steady forcing that generates an unsteady large-scale flow. Particle clustering correlates with the instantaneous Taylor-based flow Reynolds number, and anti-correlates with its instantaneous turbulent energy dissipation constant. A dimensional argument for these correlations is presented. In natural flows, unsteadiness can result in extreme particle clustering, which is stronger than the clustering expected from averaged inertial turbulence effects. |
| title | Turbulence unsteadiness drives extreme clustering |
| topic | Fluid Dynamics |
| url | https://arxiv.org/abs/2402.15015 |