NDLI: Probability Density Function Modeling of Multi-Phase Flow in Porous Media with Density-Driven Gravity Currents

Content Provider	Springer Nature Link
Author	Tyagi, Manav Jenny, Patrick
Copyright Year	2011
Abstract	A probability density function (PDF) based approach is employed to model multi-phase flow with interfacial mass transfer (dissolution) in porous media. The joint flow statistics is represented by a mass density function (MDF), which is transported in the physical and probability spaces via Fokker–Planck equation. This MDF-equation requires Lagrangian evolutions of the random flow variables; these evolutions are stochastic processes honoring the micro-scale flow physics. To demonstrate the concept, we consider an example of immiscible two-phase flow with the non-equilibrium dissolution of single component from one phase into the other-a model for solubility trapping during CO$_{2}$ storage in brine aquifer. Since CO$_{2}$-rich brine is denser than pure brine, density-driven countercurrent flow is set up in the brine phase. The stochastic models mimicking the physics of countercurrent flow lead to a modeled MDF-equation, which is solved using our recently developed stochastic particle method for multi-phase flow (Tyagi et al. J Comput Phys 227:6696–6714, 2008). In addition, we derive Eulerian equations for stochastic moments (mean, variance, etc.) and show that unlike the MDF-equation the system of moment equations is not closed. In classical Darcy formulation, for example, the mean concentration equation is closed by neglecting variance. However, with several one- and two-dimensional simulations, it is demonstrated that the PDF and Darcy modeling approaches give significantly different results. While the PDF-approach properly accounts for the long correlation length scales and the concentration variance in density-driven countercurrent flow, the same phenomenon cannot be captured accurately with a standard Darcy model.
Starting Page	603
Ending Page	623
Page Count	21
File Format	PDF
ISSN	01693913
Journal	Transport in Porous Media
Volume Number	87
Issue Number	2
e-ISSN	15731634
Language	English
Publisher	Springer Netherlands
Publisher Date	2011-02-05
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	PDF-modeling Stochastic particle method Multi-phase flow Dissolution CO$_{2}$ storage Hydrogeology Civil Engineering Industrial Chemistry/Chemical Engineering Geotechnical Engineering Classical Continuum Physics
Content Type	Text
Resource Type	Article
Subject	Catalysis

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