Direct numerical simulation of gas-solid two-phase mixing layer

2005 ◽  
Vol 14 (1) ◽  
pp. 41-47 ◽  
Author(s):  
Wenchun Li ◽  
Guilin Hu ◽  
Zhe Zhou ◽  
Jianren Fan ◽  
Kefa Cen
Keyword(s):  
Numerical Simulation ◽  
Direct Numerical Simulation ◽  
Mixing Layer ◽  
Two Phase ◽  
Phase Mixing

Numerical simulation of gas-particle two-phase mixing layer by vortex method

2002 ◽  
Vol 125 (2-3) ◽  
pp. 111-121 ◽  
Author(s):  
Tomomi Uchiyama ◽  
Masaaki Naruse
Keyword(s):  
Numerical Simulation ◽  
Mixing Layer ◽  
Vortex Method ◽  
Two Phase ◽  
Phase Mixing

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.

scholarly journals Flow topologies in bubble-induced turbulence: a direct numerical simulation analysis

2018 ◽  
Vol 857 ◽  
pp. 270-290 ◽  
Author(s):  
Josef Hasslberger ◽  
Markus Klein ◽  
Nilanjan Chakraborty
Keyword(s):  
Numerical Simulation ◽  
Direct Numerical Simulation ◽  
Turbulent Flows ◽  
Volume Fraction ◽  
Fluid Velocity ◽  
Small Scale ◽  
Flow Topology ◽  
Two Phase ◽  
Local Flow ◽  
Interface Curvature

This paper presents a detailed investigation of flow topologies in bubble-induced two-phase turbulence. Two freely moving and deforming air bubbles that have been suspended in liquid water under counterflow conditions have been considered for this analysis. The direct numerical simulation data considered here are based on the one-fluid formulation of the two-phase flow governing equations. To study the development of coherent structures, a local flow topology analysis is performed. Using the invariants of the velocity gradient tensor, all possible small-scale flow structures can be categorized into two nodal and two focal topologies for incompressible turbulent flows. The volume fraction of focal topologies in the gaseous phase is consistently higher than in the surrounding liquid phase. This observation has been argued to be linked to a strong vorticity production at the regions of simultaneous high fluid velocity and high interface curvature. Depending on the regime (steady/laminar or unsteady/turbulent), additional effects related to the density and viscosity jump at the interface influence the behaviour. The analysis also points to a specific term of the vorticity transport equation as being responsible for the induction of vortical motion at the interface. Besides the known mechanisms, this term, related to surface tension and gradients of interface curvature, represents another potential source of turbulence production that lends itself to further investigation.

scholarly journals Direct numerical simulation of two-phase gas dynamic flows with phase transition for water and for liquid sodium

2017 ◽  
Vol 115 ◽  
pp. 05009 ◽  
Author(s):  
Anna Aksenova ◽  
Vladimir Chudanov ◽  
Alexey Leonov ◽  
Artem Makarevich
Keyword(s):  
Phase Transition ◽  
Numerical Simulation ◽  
Direct Numerical Simulation ◽  
Liquid Sodium ◽  
Two Phase ◽  
Gas Dynamic ◽  
Dynamic Flows

Direct numerical simulation of a particle-laden mixing layer with a chemical reaction

2005 ◽  
Vol 31 (7) ◽  
pp. 843-866 ◽  
Author(s):  
Takenobu Michioka ◽  
Ryoichi Kurose ◽  
Kouichi Sada ◽  
Hisao Makino
Keyword(s):  
Numerical Simulation ◽  
Direct Numerical Simulation ◽  
Chemical Reaction ◽  
Mixing Layer
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