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dc.contributor.authorBhamidipati, Neerajaen
dc.contributor.authorWoods, Andrew Wen
dc.date.accessioned2020-07-31T23:30:16Z
dc.date.available2020-07-31T23:30:16Z
dc.date.issued2020-09-25en
dc.identifier.issn0022-1120
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/308653
dc.description.abstractWe study the longitudinal spreading of a passive tracer by a two-dimensional pressure-driven flow through a composite layer of porous rock which is bounded above and below by impermeable seal rock. We focus on the flow across the interface between two neighbouring zones of the rock. First, we show that, with isotropic permeability, if the interface between the two zones is tilted relative to the boundaries, then this results in a difference in travel times across the formation which in turns leads to a net shear flow. We explore the strength of this shear as a function of (a) the permeability ratio across the interface, and (b) the interface angle. Second, we show that if one zone of the rock is cross-bedded, then with uniform flow, the pressure gradient is directed at an angle to the boundary. As a result, there is a transition zone across the interface, which again leads to a net shear, even if the interface is normal to the boundaries of the layer. We explore the competition between these effects, showing how they may combine constructively to produce a larger shear, or may negate one another, reducing or reversing the sign of the shear, depending on the angle of the interface, the degree of anisotropy and the change in effective downstream permeability across the interface. We discuss some of the implications of this shear for modelling flow in such composite rocks.
dc.description.sponsorshipCambridge Trust, Total SA studentship
dc.publisherCambridge University Press
dc.rightsAll rights reserved
dc.subjectmixing and dispersionen
dc.subjectporous mediaen
dc.titleShear generation in a confined, composite layer of cross-bedded porous rocken
dc.typeArticle
prism.numberARTN R3en
prism.publicationDate2020en
prism.publicationNameJOURNAL OF FLUID MECHANICSen
prism.volume899en
dc.identifier.doi10.17863/CAM.55741
dcterms.dateAccepted2020-06-23en
rioxxterms.versionofrecord10.1017/jfm.2020.544en
rioxxterms.versionAM
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserveden
rioxxterms.licenseref.startdate2020-09-25en
dc.contributor.orcidBhamidipati, Neeraja [0000-0001-6939-4931]
dc.identifier.eissn1469-7645
rioxxterms.typeJournal Article/Reviewen
cam.orpheus.successMon Aug 03 08:53:39 BST 2020 - Embargo updated*
rioxxterms.freetoread.startdate2021-01-29


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