Numerical investigation of unsteady effects in oscillatory sheet flows
| Author(s) | Mathieu, Antoine | |
| Author(s) | Cheng, Zhen | |
| Author(s) | Chauchat, Julien | |
| Author(s) | Bonamy, Cyrille | |
| Author(s) | Hsu, Tian-Jian | |
| Date Accessioned | 2022-06-28T20:12:25Z | |
| Date Available | 2022-06-28T20:12:25Z | |
| Publication Date | 2022-06-06 | |
| Description | This article was originally published in Journal of Fluid Mechanics. The version of record is available at: https://doi.org/10.1017/jfm.2022.405. © The Author(s), 2022. Published by Cambridge University Press. | en_US |
| Abstract | In this paper, two-phase flow simulations of oscillatory sheet flow experimental configurations involving medium and fine sand using a turbulence-resolving two-fluid model are presented. The turbulence-resolving two-phase flow model reproduces the differences of behaviour observed between medium and fine sand whereas turbulence-averaged models require an almost systematic tuning of empirical model coefficients for turbulence–particle interactions. The two-fluid model explicitly resolves these interactions and can be used to study in detail the differences observed experimentally. Detailed analysis of concentration profiles, flow hydrodynamics, turbulent statistics and vertical mass balance allowed the confirmation that unsteady effects, namely phase-lag effect and enhanced boundary layer thickness, for fine sand are not only due to the small settling velocity of the particles relative to the wave period. The occurrence and intensity of unsteady effects are also affected by a complex interplay between flow instabilities, strong solid-phase Reynolds stress and turbulence attenuation caused by the presence of the particles. | en_US |
| Sponsor | The authors would like to acknowledge the financial support from Agence de l'Innovation de Défense (AID), SHOM through project MEPELS and Agence Nationale de la Recherche (ANR) through project SheetFlow (ANR-18-CE01-0003). T.-J.H. and J.C. also acknowledge support from the Munitions Response Program of the Strategic Environmental Research and Development Program under Project MR20-S1-1478. Most of the computations presented in this paper were performed using the GRICAD infrastructure and the GENCI infrastructure under allocations A0080107567 and A0100107567. The Python package FluidFoam was used for post-processing of OpenFoam data (https://github.com/fluiddyn/fluidfoam). | en_US |
| Citation | Mathieu, A., Cheng, Z., Chauchat, J., Bonamy, C., & Hsu, T. (2022). Numerical investigation of unsteady effects in oscillatory sheet flows. Journal of Fluid Mechanics, 943, A7. doi:10.1017/jfm.2022.405 | en_US |
| ISSN | 1469-7645 | |
| URL | https://udspace.udel.edu/handle/19716/31038 | |
| Language | en_US | en_US |
| Publisher | Journal of Fluid Mechanics | en_US |
| dc.rights.uri | https://creativecommons.org/licenses/by/4.0/ | |
| Keywords | sediment transport | en_US |
| Keywords | particle/fluid flow | en_US |
| Keywords | turbulent boundary layers | en_US |
| Title | Numerical investigation of unsteady effects in oscillatory sheet flows | en_US |
| Type | Article | en_US |
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