Averaging of Stochastic Equations for Flow and Transport in PorousMedia

Journal Article · Fri Jan 07 04:00:00 EST 2005 · Transport in Porous Media

OSTI ID:920054

Shvidler, Mark; Karasaki, Kenzi

It is well known that at present exact averaging of theequations of flow and transport in random porous media have been realizedfor only a small number of special fields. Moreover, the approximateaveraging methods are not yet fully understood. For example, theconvergence behavior and the accuracy of truncated perturbation seriesare not well known; and in addition, the calculation of the high-orderperturbations is very complicated. These problems for a long time havestimulated attempts to find the answer for the question: Are there inexistence some exact general and sufficiently universal forms of averagedequations? If the answer is positive, there arises the problem of theconstruction of these equations and analyzing them. There are manypublications on different applications of this problem to various fields,including: Hydrodynamics, flow and transport in porous media, theory ofelasticity, acoustic and electromagnetic waves in random fields, etc.Here, we present a method of finding some general form of exactlyaveraged equations for flow and transport in random fields by using (1)some general properties of the Green s functions for appropriatestochastic problems, and (2) some basic information about the randomfields of the conductivity, porosity and flow velocity. We presentgeneral forms of exactly averaged non-local equations for the followingcases: (1) steady-state flow with sources in porous media with randomconductivity, (2) transient flow with sources in compressible media withrandom conductivity and porosity; and (3) Nonreactive solute transport inrandom porous media. We discuss the problem of uniqueness and theproperties of the non-local averaged equations for cases with some typeof symmetry (isotropic, transversal isotropic and orthotropic), and weanalyze the structure of the nonlocal equations in the general case ofstochastically homogeneous fields.

• Research Organization: Ernest Orlando Lawrence Berkeley NationalLaboratory, Berkeley, CA (US)
• Sponsoring Organization: USDOE; Japan Nuclear Cycle Development Institute(JNC)
• DOE Contract Number: AC02-05CH11231
• OSTI ID: 920054
• Report Number(s): LBNL--56935; BnR: 600302000
• Journal Information: Transport in Porous Media, Journal Name: Transport in Porous Media Journal Issue: 3 Vol. 10.1007/s11242-007-9151-2; ISSN TPMEEI
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
ACOUSTICS
CONSTRUCTION
CONVERGENCE
ELASTICITY
HYDRODYNAMICS
POROSITY
SOLUTES
SYMMETRY
TRANSIENTS
TRANSPORT
VELOCITY