Abstract
We propose a method for effectively upscaling incompressible viscous flow in large random polydispersed sphere packings: the emphasis of this method is on the determination of the forces applied on the solid particles by the fluid. Pore bodies and their connections are defined locally through a regular Delaunay triangulation of the packings. Viscous flow equations are upscaled at the pore level, and approximated with a finite volume numerical scheme. We compare numerical simulations of the proposed method to detailed finite element simulations of the Stokes equations for assemblies of 8–200 spheres. A good agreement is found both in terms of forces exerted on the solid particles and effective permeability coefficients.
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Abbreviations
- α :
-
Nondimensional conductance factor
- Ω:
-
Full domain of the two-phase problem
- Ω i :
-
Domain defined by tetrahedron i
- Ω ij :
-
union of tetrahdra (S ij , P i ) and (S ij , P j )
- Γ:
-
Part of Ω occupied by the solid phase
- Γ i :
-
Domain occupied by solid particle i
- Θ:
-
Part of Ω occupied by the fluid phase (pore space)
- Θ i :
-
Part of Ω i occupied by the fluid phase (pore)
- Θ ij :
-
part of Ω ij occupied by the fluid phase (throat)
- S ij :
-
Surface of the facet ij, separating tetrahedra i and j
- ∂X :
-
Contour of domain X
- ∂f X :
-
Part of contour of X intersecting the fluid phase
- ∂s X :
-
Part of contour of X intersecting (or in contact with) the solid phase
- γ ij :
-
Area of ∂Θ ij in contact with spheres
- \({\gamma_{ij}^k}\) :
-
Area of the part of ∂Θ ij in contact with sphere k
- S ij :
-
The common facets of tetrahedra Ω i and Ω j
- \({A^{\rm f}_{ij}}\) :
-
Area of the fluid part S ij ∩ Θ of facet ij
- \({A^k_{ij}}\) :
-
Area of the intersection S ij ∩ Γ k of facet ij and sphere k
- P i :
-
Voronoi dual (weighted center) of tetrahedra i
- p′:
-
Microscopic (pore-scale) fluid pressure
- p i :
-
Macroscopic fluid pressure in tetrahedra i
- u′:
-
Microscopic fluid velocity
- u :
-
Macroscopic fluid velocity
- v :
-
Geometric contour velocity
- q ij :
-
Flux through facet ij
- \({V^{\rm f}_i}\) :
-
Fluid volume contained in pore i
- \({R_{ij}^{\rm h}}\) :
-
Hydraulic radius of throat ij
- \({R_{ij}^{{\rm eff}}}\) :
-
Effective radius of throat ij
- μ :
-
Dynamic viscosity
- L ij :
-
Length of throat ij
- \({F_{x}^y}\) :
-
Forces exerted by the fluid on the solid phase, x and y denote different terms in forces decomposition
- g ij :
-
Hydraulic conductance of facet (throat) ij
- K ij :
-
Hydraulic conductivity of facet (throat) ij
- l 0 :
-
Size of the cube enclosing the flow problem
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This paper has previously been published under doi:10.1007/s11242-011-9915-6. In order to include it in the special issue we reproduce it here.
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Chareyre, B., Cortis, A., Catalano, E. et al. Pore-Scale Modeling of Viscous Flow and Induced Forces in Dense Sphere Packings. Transp Porous Med 94, 595–615 (2012). https://doi.org/10.1007/s11242-012-0057-2
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DOI: https://doi.org/10.1007/s11242-012-0057-2