A direct numerical simulation study on the possibility of macroscopic turbulence in porous media: Effects of different solid matrix geometries, solid boundaries, and two porosity scales

2016 ◽  
Vol 28 (6) ◽  
pp. 065101 ◽  
Author(s):  
M.-F. Uth ◽  
Y. Jin ◽  
A. V. Kuznetsov ◽  
H. Herwig
Keyword(s):  
Numerical Simulation ◽  
Porous Media ◽  
Direct Numerical Simulation ◽  
Media Effects ◽  
Simulation Study ◽  
Solid Matrix

Numerical investigation of the possibility of macroscopic turbulence in porous media: a direct numerical simulation study

2015 ◽  
Vol 766 ◽  
pp. 76-103 ◽  
Author(s):  
Y. Jin ◽  
M.-F. Uth ◽  
A. V. Kuznetsov ◽  
H. Herwig
Keyword(s):  
Numerical Simulation ◽  
Porous Medium ◽  
Porous Media ◽  
Direct Numerical Simulation ◽  
Turbulent Flow ◽  
Flow In Porous Media ◽  
Minimum Size ◽  
Solid Matrix ◽  
Pore Scale ◽  
Turbulent Structures

AbstractWhen a turbulent flow in a porous medium is determined numerically, the crucial question is whether turbulence models should account only for turbulent structures restricted in size to the pore scale or whether the size of turbulent structures could exceed the pore scale. The latter would mean the existence of macroscopic turbulence in porous media, when turbulent eddies exceed the pore size. In order to determine the real size of turbulent structures in a porous medium, we simulated the turbulent flow by direct numerical simulation (DNS) calculations, thus avoiding turbulence modelling of any kind. With this study, which for the first time uses DNS calculations, we provide benchmark data for turbulent flow in porous media. Since perfect DNS calculations require the resolution of scales down to the Kolmogorov scale, often only approximate DNS solutions can be obtained, especially for high Reynolds numbers. This is accounted for by using and comparing two different DNS approaches, a finite volume method (FVM) with grid refinement towards the wall and a lattice Boltzmann method (LBM) with equal grid distribution. The solid matrix was simulated by a large number of rectangular bars arranged periodically. The number of bars in the solution domain with periodic boundary conditions was reduced systematically until a minimum size was found that does not suppress any large-scale turbulent structures. Two-point correlations, integral length scales and energy spectra were determined in order to answer the question of whether or not macroscopic turbulence can be found in porous media.

scholarly journals Direct Numerical Simulation of Pore-Scale Trapping Events During Capillary-Dominated Two-Phase Flow in Porous Media

2021 ◽  
Author(s):  
Mosayeb Shams ◽  
Kamaljit Singh ◽  
Branko Bijeljic ◽  
Martin J. Blunt
Keyword(s):  
Numerical Simulation ◽  
Porous Media ◽  
Direct Numerical Simulation ◽  
Complex Geometry ◽  
Flow In Porous Media ◽  
Pore Scale ◽  
Contact Lines ◽  
Two Phase ◽  
X Ray ◽  
Aspect Ratios

AbstractThis study focuses on direct numerical simulation of imbibition, displacement of the non-wetting phase by the wetting phase, through water-wet carbonate rocks. We simulate multiphase flow in a limestone and compare our results with high-resolution synchrotron X-ray images of displacement previously published in the literature by Singh et al. (Sci Rep 7:5192, 2017). We use the results to interpret the observed displacement events that cannot be described using conventional metrics such as pore-to-throat aspect ratio. We show that the complex geometry of porous media can dictate a curvature balance that prevents snap-off from happening in spite of favourable large aspect ratios. We also show that pinned fluid-fluid-solid contact lines can lead to snap-off of small ganglia on pore walls; we propose that this pinning is caused by sub-resolution roughness on scales of less than a micron. Our numerical results show that even in water-wet porous media, we need to allow pinned contacts in place to reproduce experimental results.

Direct numerical simulation of pore scale particle-water-oil transport in porous media

2019 ◽  
Vol 180 ◽  
pp. 159-175 ◽  
Author(s):  
Junwei Su ◽  
Guoliang Chai ◽  
Le Wang ◽  
Weidong Cao ◽  
Jinbiao Yu ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Porous Media ◽  
Direct Numerical Simulation ◽  
Pore Scale ◽  
Oil Transport ◽  
Transport In Porous Media ◽  
Scale Particle

scholarly journals Dynamics of triple-flames in ignition of turbulent dual fuel mixture: A direct numerical simulation study

2019 ◽  
Vol 37 (4) ◽  
pp. 4625-4633 ◽  
Author(s):  
Tai Jin ◽  
Kai H. Luo ◽  
Xujiang Wang ◽  
Kun Luo ◽  
Jianren Fan
Keyword(s):  
Numerical Simulation ◽  
Direct Numerical Simulation ◽  
Simulation Study ◽  
Fuel Mixture ◽  
Dual Fuel

Direct Numerical Simulation Study of an Experimental Lifted H2/N2 Flame. Part 2: Flame Stabilization

2012 ◽  
Vol 26 (8) ◽  
pp. 4830-4839 ◽  
Author(s):  
Haiou Wang ◽  
Kun Luo ◽  
Fuxing Yi ◽  
Jianren Fan
Keyword(s):  
Numerical Simulation ◽  
Direct Numerical Simulation ◽  
Simulation Study ◽  
Flame Stabilization
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