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  • Journal article
    Buchan A, Eaton MD, Goddard AJH, Pain CCet al., 2012,

    Simulated transient dynamics and heat transfer characteristics of the water boiler nuclear reactor SUPO with cooling coil heat extraction

    , Annals of nuclear energy, Vol: 48, Pages: 68-83

    The term “water boiler” reactor refers to a type of aqueous homogeneous reactor (AHR) that was designed, built and operated by Los Alamos in the 1940s. This was the first type of liquid fuelled reactor and the first to be fuelled with enriched Uranium. For security reasons the term “water boiler” was adopted and three versions were built: LOPO (for low power), HYPO (for high power) and SUPO (for super power) which were spherical shaped reactor vessels. The name was appropriate as the reactors appeared to boil although this was actually due to the release of radiolytic gas bubbles; although SUPO was operated during some studies close to the boiling point of uranyl nitrate. The final water boiler “SUPO” was operated almost daily as a neutron source from 1951 until its deactivation in 1974-23 years of safe, reliable operation. Many of the key neutron measurements needed in the design of the early atomic weapons were made using LOPO, HYPO and SUPO. More recently SUPO has been considered as a benchmark for quasi-steady-state operation of AHRs with internal cooling structures.This paper presents modelling and analysis of the coupled neutronic and fluid time dependent characteristics of the SUPO reactor. In particular the quasi-steady-state dynamics of SUPO have been investigated together with its heat transfer characteristics. In the simulations presented the SUPO reactor is modelled using the spatially dependent neutron/multiphase CFD simulation tool, FETCH, at a quasi-steady-state power of 25 kW. SUPO also possessed a cooling coil system that fed cooling water through the reactor for the extraction of the fission and decay heat. This cooling system, and the heat extraction, is modelled in the simulations using a new sub-modelling approach that is detailed here. The results from this simulation, such as gas fraction, gas generation rate, coolant rate and average temperature, are compared against the available experimental information.

  • Journal article
    Xie Z, 2012,

    Numerical study of breaking waves by a two-phase flow model

    , International Journal for Numerical Methods in Fluids, Vol: 70, Pages: 246-268, ISSN: 0271-2091

    A two-phase flow model, which solves the flow in the air and water simultaneously, is presented for modelling breaking waves in deep and shallow water, including wave pre-breaking, overturning and post-breaking processes. The model is based on the Reynolds-averaged Navier-Stokes equations with the k -ε turbulence model. The governing equations are solved by the finite volume method in a Cartesian staggered grid and the partial cell treatment is implemented to deal with complex geometries. The SIMPLE algorithm is utilised for the pressure-velocity coupling and the air-water interface is modelled by the interface capturing method via a high resolution volume of fluid scheme. The numerical model is validated by simulating overturning waves on a sloping beach and over a reef, and deep-water breaking waves in a periodic domain, in which good agreement between numerical results and available experimental measurements for the water surface profiles during wave overturning is obtained. The overturning jet, air entrainment and splash-up during wave breaking have been captured by the two-phase flow model, which demonstrates the capability of the model to simulate free surface flow and wave breaking problems. © 2011 John Wiley & Sons, Ltd.

  • Journal article
    Solano JMS, Jackson MD, Sparks RSJ, Blundy JD, Annen Cet al., 2012,

    Melt Segregation in Deep Crustal Hot Zones: a Mechanism for Chemical Differentiation, Crustal Assimilation and the Formation of Evolved Magmas

    , Journal of Petrology, Vol: 53, Pages: 1999-2026, ISSN: 1460-2415

    Mantle-derived basaltic sills emplaced in the lower crust provide amechanism for the generation of evolved magmas in deep crustal hotzones (DCHZ).This study uses numerical modelling to characterizethe time required for evolved magma formation, the depth and temperatureat which magma formation occurs, and the composition ofthe magma.The lower crust is assumed to comprise amphibolite. Inan extension of previous DCHZ models, the new model couples heattransfer during the repetitive emplacement of sills with mass transfervia buoyancy-driven melt segregation along grain boundaries.The resultsshed light on the dynamics of DCHZ development and evolution.TheDCHZ comprises a mush of crystals plus interstitial melt,except when a new influx of basaltic magma yields a short-lived(20^200 years) reservoir of melt plus suspended crystals (magma).Melt segregation and accumulation within the mush yields two contrastingmodes of evolved magma formation, which operate over timescalesof c. 10 kyr-1 Myr, depending upon emplacement rate andstyle. In one, favoured by emplacement via over-accretion, or emplacementat high rates, evolved magma forms in the crust overlying theintruded basalt sills, and is composed of crustal partial melt, and residualmelt that has migrated upwards out of the crystallizingbasalt. In the other, favoured by emplacement via under- orintra-accretion, or by emplacement at lower rates, evolved magmaforms in the intruded basalt, and the resulting magma is composedprimarily of residual melt. In all cases, the upward migration ofbuoyant melt yields cooler and more evolved magmas, which arebroadly granitic in composition. Chemical differentiation is thereforedriven by melt migration, because the melt migrates through, andchemically equilibrates with, partially molten rock at progressivelylower temperatures. Crustal assimilation occurs during partial melting,and mixing of crustal and residual melt occurs when residualmelt migrates into the partially molten crust, yielding

  • Journal article
    Sakai M, Takahashi H, Pain CC, Latham J-P, Xiang Jet al., 2012,

    Study on a large-scale discrete element model for fine particles in a fluidized bed

    , ADVANCED POWDER TECHNOLOGY, Vol: 23, Pages: 673-681, ISSN: 0921-8831
  • Journal article
    Ilankoon IMSK, Neethling SJ, 2012,

    Hysteresis in unsaturated flow in packed beds and heaps

    , MINERALS ENGINEERING, Vol: 35, Pages: 1-8, ISSN: 0892-6875
  • Journal article
    Elsheikh AH, Jackson MD, Laforce TC, 2012,

    Bayesian Reservoir History Matching Considering Model and Parameter Uncertainties

    , MATHEMATICAL GEOSCIENCES, Vol: 44, Pages: 515-543, ISSN: 1874-8961
  • Journal article
    Baker CMJ, Buchan AG, Pain CC, Tollit B, Eaton MD, Warner Pet al., 2012,

    Quadratic inner element subgrid scale discretisation of the Boltzmann transport equation

    , Annals of Nuclear Energy, Vol: 45, Pages: 124-137

    This paper explores the application of the inner element subgrid scale method to the Boltzmann transport equation using quadratic basis functions. Previously, only linear basis functions for both the coarse scale and the fine scale were considered. This paper, therefore, analyses the advantages of using different coarse and subgrid basis functions for increasing the accuracy of the subgrid scale method. The transport of neutral particle radiation may be described by the Boltzmann transport equation (BTE) which, due to its 7 dimensional phase space, is computationally expensive to resolve. Multi-scale methods offer an approach to efficiently resolve the spatial dimensions of the BTE by separating the solution into its coarse and fine scales and formulating a solution whereby only the computationally efficient coarse scales need to be solved. In previous work an inner element subgrid scale method was developed that applied a linear continuous and discontinuous finite element method to represent the solution’s coarse and fine scale components. This approach was shown to generate efficient and stable solutions, and so this article continues its development by formulating higher order quadratic finite element expansions over the continuous and discontinuous scales. Here it is shown that a solution’s convergence can be improved significantly using higher order basis functions. Furthermore, by using linear finite elements to represent coarse scales in combination with quadratic fine scales, convergence can also be improved with only a modest increase in computational expense.

  • Journal article
    Morris G, Neethling SJ, Cilliers JJ, 2012,

    Modelling the self orientation of particles in a film

    , MINERALS ENGINEERING, Vol: 33, Pages: 87-92, ISSN: 0892-6875
  • Conference paper
    Nygaard ET, Pain CC, Eaton MD, Gomes JLMA, Goddard AJH, Gorman GJ, Tollit B, Buchan AG, Cooling CM, Angelo PLet al., 2012,

    Steps Towards Verification and Validation of the FETCH Code for Level 2 Analysis, Design and Optimization of Aqueous Homogeneous Reactors

    , PHYSOR
  • Journal article
    Glover PWJ, Walker E, Jackson MD, 2012,

    Streaming-potential coefficient of reservoir rock: A theoretical model

    , Geophysics, Vol: 77, Pages: D17-D43, ISSN: 1942-2156

    The streaming potential is that electrical potential whichdevelops when an ionic fluid flows through the pores of a rock.It is an old concept that is recently being applied in many fieldsfrom monitoring water fronts in oil reservoirs to understandingthe mechanisms behind synthetic earthquakes. We have carriedout fundamental theoretical modeling of the streaming-potentialcoefficient as a function of pore fluid salinity, pH, and temperatureby modifying the HS equation for use with porous rocksand using input parameters from established fundamental theory(the Debye screening length, the Stern-plane potential, the zetapotential, and the surface conductance). The model also requiresthe density, electrical conductivity, relative electric permittivityand dynamic viscosity of the bulk fluid, for which empiricalmodels are used so that the temperature of the model may bevaried. These parameters are then combined with parametersthat describe the rock microstructure. The resulting theoreticalvalues have been compared with a compilation of data for siliceousmaterials comprising 290 streaming-potential coefficientmeasurements and 269 zeta-potential measurements obtainedexperimentally for 17 matrix-fluid combinations (e.g., sandstonesaturated with KCl), using data from 29 publications.The theoretical model was found to ably describe the main featuresof the data, whether taken together or on a sample by samplebasis. The low-salinity regime was found to be controlled bysurface conduction and rock microstructure, and was sensitiveto changes in porosity, cementation exponent, formation factor,grain size, pore size and pore throat size as well as specific surfaceconductivity. The high-salinity regime was found to be subjectto a zeta-potential offset that allows the streaming-potentialcoefficient to remain significant even as the saturation limit isapproached

  • Journal article
    Kramer SC, Wilson CR, Davies DR, 2012,

    An implicit free surface algorithm for geodynamical simulations

    , PHYSICS OF THE EARTH AND PLANETARY INTERIORS, Vol: 194, Pages: 25-37, ISSN: 0031-9201
  • Journal article
    Jackson MD, Vinogradov J, 2012,

    Impact of wettability on laboratory measurements of streaming potential in carbonates

    , COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS, Vol: 393, Pages: 86-95, ISSN: 0927-7757
  • Conference paper
    Miljkovic K, Collins GS, Chapman DJ, Patel MR, Proud WGet al., 2012,

    HIGH-VELOCITY IMPACTS IN POROUS SOLAR SYSTEM MATERIALS

    , 7th Biennial Conference of the American-Physical-Society-Topical-Group on Shock Compression of Condensed Matter, Publisher: AMER INST PHYSICS, ISSN: 0094-243X
  • Conference paper
    Gorman GJ, Southern J, Farrell PE, Piggott MD, Rokos G, Kelly PHJet al., 2012,

    Hybrid OpenMP/MPI anisotropic mesh smoothing

    , International Conference on Computational Science (ICCS), Publisher: ELSEVIER SCIENCE BV, Pages: 1513-1522, ISSN: 1877-0509
  • Journal article
    Latham JP, Xiang J, Belayneh M, Nick HM, Tsang C, Blunt MJet al., 2012,

    Modelling stress-dependent permeability in fractured rock including effects of propagating and bending fractures

    , International Journal of Rock Mechanics and Mining Sciences, Vol: 57, Pages: 100-112
  • Conference paper
    Rathgeber F, Markall GR, Mitchell L, Loriant N, Ham DA, Bertolli C, Kelly PHJ, Rathgeber F, Markall GR, Mitchell L, Loriant N, Ham DA, Bertolli C, Kelly PHJet al., 2012,

    PyOP2: A High-Level Framework for Performance-Portable Simulations on Unstructured Meshes

    , High Performance Computing, Networking Storage and Analysis, SC Companion, Publisher: IEEE Computer Society, Pages: 1116-1123

    Emerging many-core platforms are very difficult to program in a performance portable manner whilst achieving high efficiency on a diverse range of architectures. We present work in progress on PyOP2, a high-level embedded domain-specific language for mesh-based simulation codes that executes numerical kernels in parallel over unstructured meshes. Just-in-time kernel compilation and parallel scheduling are delayed until runtime, when problem-specific parameters are available. Using generative metaprogramming, performance portability is achieved, while details of the parallel implementation are abstracted from the programmer. PyOP2 kernels for finite element computations can be generated automatically from equations given in the domain-specific Unified Form Language. Interfacing to the multi-phase CFD code Fluidity through a very thin layer on top of PyOP2 yields a general purpose finite element solver with an input notation very close to mathematical formulae. Preliminary performance figures show speedups of up to 3.4x compared to Fluidity's built-in solvers when running in parallel.

  • Conference paper
    Lange M, Field T, 2012,

    Accelerating agent-based ecosystem models using the cell broadband engine

    , Berlin, Heidelberg, Publisher: Springer-Verlag, Pages: 1-12
  • Journal article
    Weiland M, Mitchell L, Gorman G, Kramer S, Southern J, Parsons Met al., 2012,

    Mixed-mode implementation of PETSc for scalable linear algebra on multi-core processors

  • Journal article
    Davison TM, Ciesla FJ, Collins GS, 2012,

    Post-Impact Thermal Evolution of Porous Planetesimals

    , Geochimica et Cosmochimica Acta, Vol: 95, Pages: 252-269, ISSN: 0016-7037
  • Journal article
    Jackson MD, Leinov E, 2012,

    On the Validity of the “Thin” and “Thick”Double-Layer Assumptions When CalculatingStreaming Currents in Porous Media

    , International Journal of Geophysics, Vol: 2012, ISSN: 1687-8868

    We find that the thin double layer assumption, in which the thickness of the electrical diffuse layer is assumed small comparedto the radius of curvature of a pore or throat, is valid in a capillary tubes model so long as the capillary radius is >200 times thedouble layer thickness, while the thick double layer assumption, in which the diffuse layer is assumed to extend across the entirepore or throat, is valid so long as the capillary radius is >6 times smaller than the double layer thickness. At low surface chargedensity (<10 mC · m−2) or high electrolyte concentration (>0.5 M) the validity criteria are less stringent. Our results suggest thatthe thin double layer assumption is valid in sandstones at low specific surface charge (<10 mC · m−2), but may not be valid insandstones of moderate- to small pore-throat size at higher surface charge if the brine concentration is low (<0.001 M). The thickdouble layer assumption is likely to be valid in mudstones at low brine concentration (<0.1 M) and surface charge (<10 mC·m−2),but at higher surface charge, it is likely to be valid only at low brine concentration (<0.003 M). Consequently, neither assumptionmay be valid in mudstones saturated with natural brines.

  • Journal article
    Du J, Fang F, Pain CC, Navon IM, Zhu J, Ham DAet al., 2012,

    POD reduced-order unstructured mesh modelling applied to 2D and 3D fluid flow

    , Computers & Mathematics with Applications
  • Conference paper
    Brito-Parada PR, Neethling SJ, Cilliers JJ, 2012,

    CFD study of liquid drainage in flotation foams

    , 22nd European Symposium on Computer Aided Process Engineering (ESCAPE 22)
  • Journal article
    Cole KE, Brito-Parada PR, Xu C, Neethling SJ, Cilliers JJet al., 2012,

    Experimental studies and numerical model validation of overflowing 2D foam to test flotation cell crowder designs

    , Chemical Engineering Research and Design
  • Journal article
    Brito-Parada PR, Cilliers JJ, 2012,

    Experimental and numerical studies of launder configurations in a two-phase flotation system

    , Minerals Engineering
  • Journal article
    Piotrowski M, McGilvary G, Sloan T, Mewissen M, Lloyd A, Forster T, Mitchell L, Ghazal P, Hill Jet al., 2012,

    Exploiting Parallel R in the Cloud with SPRINT

    , Methods of Information in Medicine
  • Journal article
    Jackson MD, Butler AP, Vinogradov J, 2012,

    Measurements of Spontaneous Potential in Chalk with Application to Aquifer Characterisation in the Southern UK

    , Quarterly Journal of Engineering Geology and Hydrogeology
  • Journal article
    Jackson MD, Gulamali MY, Leinov E, Saunders JH, Vinogradov Jet al., 2012,

    Spontaneous Potentials in Hydrocarbon Reservoirs during Waterflooding: Application to Waterfront Monitoring

    , SPE Journal
  • Journal article
    Brito-Parada PR, Kramer SC, Wilson CR, Pain CC, Neethling SJ, Cilliers JJet al., 2012,

    A finite element formulation to model the flow of flotation foams

  • Journal article
    Brito-Parada PR, Neethling SJ, Cilliers JJ, 2012,

    The advantages of using mesh adaptivity to model the drainage of liquid in froths

    , Minerals Engineering, Vol: 33, Pages: 80-86
  • Journal article
    Saunders JH, Jackson MD, Pain CC, Vinogradov J, Saunders JH, Jackson MD, Gulamali MY, Vinogradov J, Pain CC, Saunders JH, Jackson MD, Gulamali MY, Vinogradov Jet al., 2012,

    Streaming potentials in hydrocarbon reservoir conditions

    , Geophysics, Vol: 77, Pages: E77-E90
  • Journal article
    Hill J, Piggott MD, Ham DA, Popova EE, Srokosz MA, Hill J, Piggott M, Ham D, Popova E, Srokosz M, Hill J, Ham DA, Piggott MD, Popova EE, Srokosz MAet al., 2012,

    On the performance of a generic length scale turbulence model within an adaptive finite element ocean model

    , Ocean Modelling, Vol: 56, Pages: 1-15

    Research into the use of unstructured mesh methods for ocean modelling has been growing steadily in the last few years. One advantage of using unstructured meshes is that one can concentrate resolution where it is needed. In addition, dynamic adaptive mesh optimisation (DAMO) strategies allow resolution to be concentrated when this is required. Despite the advantage that DAMO gives in terms of improving the spatial resolution where and when required, small-scale turbulence in the oceans still requires parameterisation. A two-equation, generic length scale (GLS) turbulence model (one equation for turbulent kinetic energy and another for a generic turbulence length-scale quantity) adds this parameterisation and can be used in conjunction with adaptive mesh techniques. In this paper, an implementation of the GLS turbulence parameterisation is detailed in a non-hydrostatic, finite-element, unstructured mesh ocean model, Fluidity-ICOM. The implementation is validated by comparing to both a laboratory-scale experiment and real-world observations, on both fixed and adaptive meshes. The model performs well, matching laboratory and observed data, with resolution being adjusted as necessary by DAMO. Flexibility in the prognostic fields used to construct the error metric used in DAMO is required to ensure best performance. Moreover, the adaptive mesh models perform as well as fixed mesh models in terms of root mean square error to observation or theoretical mixed layer depths, but uses fewer elements and hence has a reduced computational cost.

  • Conference paper
    Baker CMJ, Buchan AG, Pain CC, Tollit B, Goffin MA, Eaton MD, Merton SR, Smedley Stevenson PN, Warner Pet al., 2011,

    Anisotropic mesh adaptivity for eigenvalue calculations using energy dependent meshes

    , International Conference in Nuclear Criticalit
  • Conference paper
    Buchan AG, Pain CC, Eaton MD, Gomes JLMA, Gorman GJ, Cooling CM, Goddard AJH, Nygaard ET, Glenn DE, Angelo PLet al., 2011,

    Dynamics and heat transfer characteristics of the water boiler reactor - SUPO

    , International Conference in Nuclear Criticality
  • Conference paper
    Buchan AG, Pain CC, Eaton MD, Gomes JLMA, Gorman GJ, Cooling CM, Goddard AJH, Nygaard ET, Glenn DE, Angelo PNet al., 2011,

    Simulated spatially dependent transient kinetics analysis of the oak ridge Y12 Plant criticality excursion, International Conference in Nuclear Criticality

    , International Conference in Nuclear Criticality
  • Journal article
    Southern J, Gorman GJ, Piggott MD, Farrell PEet al., 2011,

    Parallel anisotropic mesh adaptivity with dynamic load balancing for cardiac electrophysiology

    , Journal of Computational Science, Vol: 3, Pages: 8-16
  • Journal article
    Davison TM, Collins GS, Elbeshausen D, Wuennemann K, Kearsley Aet al., 2011,

    Numerical modeling of oblique hypervelocity impacts on strong ductile targets

    , METEORITICS & PLANETARY SCIENCE, Vol: 46, Pages: 1510-1524, ISSN: 1086-9379
  • Journal article
    Collins GS, Elbeshausen D, Davison TM, Robbins SJ, Hynek BMet al., 2011,

    The size-frequency distribution of elliptical impact craters

    , Earth and Planetary Science Letters, Vol: 310, Pages: 1-8, ISSN: 0012-821X
  • Journal article
    Morris GDM, Neethling SJ, Cilliers JJ, 2011,

    A Model for the Stability of Films Stabilized by Randomly Packed Spherical Particles

    , LANGMUIR, Vol: 27, Pages: 11475-11480, ISSN: 0743-7463
  • Journal article
    Jackson MD, Vinogradov J, Saunders JH, Jaafar MZet al., 2011,

    Laboratory Measurements and Numerical Modeling of Streaming Potential for Downhole Monitoring in Intelligent Wells

    , SPE JOURNAL, Vol: 16, Pages: 625-636, ISSN: 1086-055X
  • Journal article
    Morris G, Neethling SJ, Cilliers JJ, 2011,

    An investigation of the stable orientations of orthorhombic particles in a thin film and their effect on its critical failure pressure

    , JOURNAL OF COLLOID AND INTERFACE SCIENCE, Vol: 361, Pages: 370-380, ISSN: 0021-9797
  • Journal article
    Neethling SJ, Morris GDM, Garrett PR, 2011,

    Modeling Droplets in Plateau Borders

    , Langmuir

    It is widely known that oil droplets can decrease the stability ofaqueous films and foams. While less widely recognized, it has also beenobserved that oil droplets can, under certain circumstances, increase thestability of foams, especially if they are caught in the Plateau borders. In thispaper, how the oil droplet deforms and is, in turn, deformed by the Plateauborder is modeled using Surface Evolver. The two dimensionless parametersthat affect these shapes are the size of the oil droplet relative to the Plateauborder and the ratio of the oil water interfacial tension to the air waterinterfacial tension. The calculated pressures in all the phases were used toobtain the pressure exerted on the oil water air pseudoemulsion film, whichallows the factors that influence the stability of these droplets in the Plateauborder to be investigated. The final section of the paper demonstrates that thepresence of an oil droplet in a Plateau border can have a major influence on thedrainage of the aqueous phase along the Plateau border. This retardation of the flow would result in the oil droplets in the Plateauborders increasing the stability of foams in which they are found.

  • Journal article
    Gomes JLMA, Pain CC, Eaton MD, Tollit B, Goddard AJH, Piggott MD, Ziver K, Yamane Y, Gomes JLMA, Pain CC, Tollit B, Eaton MD, Piggott MD, Goddard AJH, Ziver AK, Yamane Yet al., 2011,

    Coupled neutronics-fluids modelling of criticality within a MOX powder system

    , PROGRESS IN NUCLEAR ENERGY, Vol: 53, Pages: 523-552, ISSN: 0149-1970

    Investigation of nuclear criticality in powder systems is necessary for the assessment of industrial plant integrity and potential radiation impacts on worker and the public health. For nuclear fuel processing, to produce fuel pellets, MOX (UO2 + PuO2) and zinc stearate (lubricant) powders are homogenised in a stirred vessel. The coupled multi-fluids (multiphase and multi-component) and neutron-radiation transport FETCH model was extended to simulate reactivity feedback mechanisms and to assess safety and potential risks of criticality incursions in 2-3D systems. This work has strengthened links with the Japan Atomic Energy Agency (JAEA), led to consultancy work with Japanese National Labs and work with Tokyo University that led on to the Todai Forum and the core to core program with Japan.

  • Conference paper
    Bland PA, Muxworthy AR, Collins GS, Moore J, Davison TM, Ciesla FJet al., 2011,

    Heterogeneous shock in porous chondrites: Implications for Allende magnetization

    , 74th Annual Meeting of the Meteoritical-Society, Publisher: Wiley-Blackwell, Pages: A22-A22, ISSN: 1086-9379
  • Conference paper
    Miljkovic K, Mannick S, Collins GS, Bland PAet al., 2011,

    HYDROCODE SIMULATIONS OF BINARY ASTEROID IMPACTS

    , 74th Annual Meeting of the Meteoritical-Society, Publisher: WILEY-BLACKWELL, Pages: A161-A161, ISSN: 1086-9379
  • Conference paper
    Davison TM, Ciesla FJ, Collins GS, 2011,

    Quantification of the post-impact thermal evolution of planetesimals

    , 74th Annual Meeting of the Meteoritical-Society, Publisher: Wiley-Blackwell, Pages: A53-A53, ISSN: 1086-9379
  • Conference paper
    Collins GS, Davison TM, Ciesla FJ, 2011,

    The effects of planetesimal collisions

    , 74th Annual Meeting of the Meteoritical-Society, Publisher: Wiley-Blackwell, Pages: A46-A46, ISSN: 1086-9379
  • Journal article
    Wozniakiewicz PJ, Ishii HA, Kearsley AT, Burchell MJ, Bland PA, Bradley JP, Dai Z, Teslich N, Collins GS, Cole MJ, Russell SSet al., 2011,

    Investigation of iron sulfide impact crater residues: A combined analysis by scanning and transmission electron microscopy

    , METEORITICS & PLANETARY SCIENCE, Vol: 46, Pages: 1007-1024, ISSN: 1086-9379
  • Journal article
    Ardjmandpour N, Pain C, Singer J, Saunders J, Aristodemou E, Carter Jet al., 2011,

    Artificial neural network forward modelling and inversion of electrokinetic logging data

    , GEOPHYSICAL PROSPECTING, Vol: 59, Pages: 721-748, ISSN: 0016-8025
  • Journal article
    Wang H, Colvile RN, Pain C, Aristodemou E, ApSimon HMet al., 2011,

    Understanding peak pedestrian exposures due to traffic emissions within the urban environment

    , TRANSPORTATION RESEARCH PART D-TRANSPORT AND ENVIRONMENT, Vol: 16, Pages: 392-401, ISSN: 1361-9209
  • Journal article
    Gulamali MY, Leinov E, Jackson MD, 2011,

    Self-potential anomalies induced by water injection into hydrocarbon reservoirs

    , Geophysics, Vol: 76, Pages: F283-F292, ISSN: 1942-2156

    The injection of cold water into a hydrocarbon reservoir containingrelatively warmer, more saline formation brine may generateself-potential anomalies as a result of electrokinetic,thermoelectric, and=or electrochemical effects. We havenumerically assessed the relative contributions of these effectsto the overall self-potential signal generated during oil productionin a simple hydrocarbon reservoir model. Our aim was todetermine if measurements of self-potential at a production wellcan be used to detect the movement of water toward the well.The coupling coefficients for the electrochemical and thermoelectricpotentials are uncertain, so we considered four differentmodels for them. We also investigated the effect of altering thesalinities of the formation and injected brines. We found thatthe electrokinetic potential peaked at the location of the saturationfront (reaching values of 0.2 mV even for the most salinebrine considered). Moreover, the value at the production wellincreased as the front approached the well, exceeding the noiselevel ( 0.1 mV). Thermoelectric effects gave rise to largerpotentials in the reservoir (10 mV), but values at the wellwere negligible ð Þ .0:1 mV until after water breakthroughbecause of the lag in the temperature front relative to the saturationfront. Electrochemical potentials were smaller in magnitudethan thermoelectric potentials in the reservoir but were measurableð Þ > 0:1 mV at the well because the salinity front wasclosely associated with the saturation front. When the formationbrine was less saline (1 mol=liter), electrokinetic effects dominated;at higher salinities (5 mol=liter), electrochemicaleffects were significant. We concluded that the measurement ofself-potential signals in a production well may be used to monitorthe movement of water in hydrocarbon reservoirs duringproduction, but further research is required to understand thethermoelectric and electrochemical coupling coefficients in partiallysatu

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