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Lagrangian dynamics and heat transfer in porous-media convection

Shuang Liu Tsinghua University Linfeng Jiang Tsinghua University Cheng Wang Tsinghua University Chao Sun Tsinghua University

Fluid Dynamics and Shock Waves mathscidoc:2205.14009

Journal of Fluid Mechanics, 917, 2021.4
We report a numerical study of Rayleigh-Benard convection through random porous media using pore-scale modelling, focusing on the Lagrangian dynamics of fluid particles and heat transfer for varied porosities . Due to the interaction between the porous medium and the coherent flow structures, the flow is found to be highly heterogeneous, consisting of convection channels with strong flow strength and stagnant regions with low velocities. The modifications of flow field due to porous structure have a significant influence on the dynamics of fluid particles. Evaluation of the particle displacement along the trajectory reveals the emergence of anomalous transport for long times as is decreased, which is associated with the long-time correlation of Lagrangian velocity of the fluid. As porosity is decreased, the cross-correlation between the vertical velocity and temperature fluctuation is enhanced, which reveals a mechanism to enhance the heat transfer in porous-media convection.
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[ Download ] [ 2022-05-17 14:39:53 uploaded by SLiu ] [ 595 downloads ] [ 0 comments ] 
@inproceedings{shuang2021lagrangian,
  title={Lagrangian dynamics and heat transfer in porous-media convection},
  author={Shuang Liu, Linfeng Jiang, Cheng Wang, and Chao Sun},
  url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20220517143953948296225},
  booktitle={Journal of Fluid Mechanics},
  volume={917},
  year={2021},
}
Shuang Liu, Linfeng Jiang, Cheng Wang, and Chao Sun. Lagrangian dynamics and heat transfer in porous-media convection. 2021. Vol. 917. In Journal of Fluid Mechanics. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20220517143953948296225.
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