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Title: Rayleigh-Darcy convection with hydrodynamic dispersion

Journal Article · · Physical Review Fluids
 [1];  [2];  [1]
  1. Univ. of Texas, Austin, TX (United States). Inst. of Computational Engineering and Sciences, Dept. of Geological Sciences, and Jackson School of Geosciences
  2. Univ. of Texas, Austin, TX (United States).Dept. of Geological Sciences, and Jackson School of Geosciences

We investigate the effect of hydrodynamic dispersion on convection in porous media by performing direct numerical simulations (DNS) in a two-dimensional Rayleigh-Darcy domain. Scaling analysis of the governing equations shows that the dynamics of this system are not only controlled by the classical Rayleigh-Darcy number based on molecular diffusion, Ram, and the domain aspect ratio, but also controlled by two other dimensionless parameters: the dispersive Rayleigh number Rad=H/αt and the dispersivity ratio r=αlt, where H is the domain height and αt and αl are the transverse and longitudinal dispersivities, respectively. For Δ=Rad/Ram>O(1), the influence from the mechanical dispersion is minor; for Δ≲0.02, however, the flow pattern is determined by Rad while the convective flux is F~c(Rad)Ram for large Ram. Our DNS results also show that the increase of mechanical dispersion, i.e., decreasing Rad, will coarsen the convective pattern by increasing the plume spacing. Moreover, the inherent anisotropy of mechanical dispersion breaks the columnar structure of the megaplumes at large Ram, if Rad<5000. This results in a fan-flow geometry that reduces the convective flux.

Research Organization:
Univ. of Texas, Austin, TX (United States); Energy Frontier Research Centers (EFRC) (United States). Center for Frontiers of Subsurface Energy Security (CFSES)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
SC0001114
OSTI ID:
1566692
Journal Information:
Physical Review Fluids, Journal Name: Physical Review Fluids Journal Issue: 12 Vol. 3; ISSN 2469-990X
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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