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  • Conference paper
    Xiang J, Latham JP, Munjiza A, Mindel Jet al., 2008,

    Applications of the combined finite-discrete element method

    , Discrete Element Methods and Numerical Modelling of Discontinuum Mechanics, Pages: 223-231
  • Conference paper
    Garcia X, Latham JP, Xiang J, Munjiza Aet al., 2008,

    Modelling of the forming processes of sandstones with irregular particles

    , Discrete Element Methods and Numerical Modelling of Discontinuum Mechanics, DEM'08, Pages: 232-241
  • Book chapter
    Piggott MD, Pain CC, Gorman GJ, 2008,

    Unstructured adaptive meshes for ocean modeling

    , Ocean modeling in an eddying regime, Editors: Hecht, Hasumi, Hecht, Hasumi, Publisher: Amer Geophysical Union, Pages: 383-408, ISBN: 9780875904429
  • Journal article
    Gomes JLMA, Pain CC, Eaton MD, Piggott MD, Goddard AJH, Ziver AK, Yamane Y, de Oliveira CREet al., 2008,

    Investigation of nuclear criticality within a powder using coupled neutronics and thermofluids

    , Annals of Nuclear Engineering, Vol: 35, Pages: 2073-2093
  • Conference paper
    Schiava D'Albano GG, Munjiza A, Rougier E, Latham JP, John NWMet al., 2008,

    Fluid driven fracture processes in FEM/DEM analysis

    , Discrete Element Methods and Numerical Modelling of Discontinuum Mechanics, DEM'08, Pages: 242-248
  • Journal article
    Jonoud S, Jackson MD, 2008,

    Validity of Steady-State Upscaling Techniques

    , SPE Reservoir Evaluation and Engineering, Vol: April, Pages: 405-416
  • Conference paper
    Munjiza A, Xiang J, Garcia X, Latham JP, Schiava D'Albano G, John NMWet al., 2008,

    The Virtual Geoscience Workbench, VGW: Open source tools for discontinuous systems

    , Discrete Element Methods and Numerical Modelling of Discontinuum Mechanics, Pages: 113-121
  • Conference paper
    Addiego-Guevara EA, Jackson MD, Giddens MA, 2008,

    Insurance value of intelligent well technology against reservoir uncertainty

    , SPE/DOE Improved Oil Recovery Symposium
  • Journal article
    Allison PA, Maeda H, TuZino T, Maeda Yet al., 2008,

    Exceptional preservation within Pleistocene lacustrine sediments of Shiobara, Japan

    , Palaois, Vol: 23, Pages: 260-266
  • Journal article
    Rushmer T, Jackson MD, 2008,

    Impact of melt segregation on tonalite–trondhjemite–granodiorite (TTG) petrogenesis

    , Trans. Royal Society of Edinburgh: Earth Science, Vol: 79, Pages: 325-336
  • Journal article
    saunders J, jackson M, pain C, 2008,

    Fluid flow monitoring in oilfields using downhole measurements of electrokinetic potential

    , Geophysics, Vol: 73, Pages: E165-E180

    Downhole measurements of electrokinetic potential are a promising new technology for hydrocarbon reservoir monitoring. Using a 3Dfinite-element model combining both multiphase flow and electrokinetic components, we investigated the behavior of electrokinetic (streaming) potential during oil production in a range of reservoir environments. We found that streaming-potential signals originate at fluid fronts and at geologic boundaries where fluid saturation changes. As water encroaches on an oil production well, the streaming-potential signal associated with the water front encompasses the well even when the front is up to 100 m away, so the potential measured at the well starts to change significantly relative to a distant reference electrode. Variations in the geometry of the encroaching water front can be characterized using an array of electrodes positioned along the well, but a good understanding of the local reservoir geology is required to identify signals caused by the front. The streaming potential measured at a well is maximized in low-permeability reservoirs produced at a high rate and in thick reservoirs with low shale content. However, considerable uncertainties remain, particularly relating to the nature of electrokinetic coupling at high salinity and during multiphase flow. Our results suggest that the streaming potential at low salinity (10^-3–10^-4 mol/L) is large (100–1000 mV) but might become too small to resolve (<0.1) mV at high salinity (0.5–2 mol/L), depending on how the available data for the electrokinetic coupling at low salinity are extrapolated into the high-salinity domain. More work remains to determine the behavior of electrokinetic coupling and therefore the utility of this technique at high salinity.

  • Journal article
    Latham J-P, Munjiza A, Garcia X, Xiang J, Guises Ret al., 2008,

    Three-dimensional particle shape acquisition and use of shape library for DEM and FEM/DEM simulation

    , Minerals Engineering, Vol: 21, Pages: 797-805
  • Journal article
    Lin JG, Xie ZH, Zhou JT, 2007,

    High-order compact scheme and its stability analysis for the pollutant diffusion equation

    , Jisuan Lixue Xuebao/Chinese Journal of Computational Mechanics, Vol: 24, Pages: 790-794, ISSN: 1007-4708

    An explicit numerical method which has arbitrary order of accuracy in time was derived in this paper, including the analysis of the stability and the accuracy of the pollutant diffusion equation. The conventional explicit Forward Time Central Space scheme (FTCS) is the specific form with first order accuracy of the proposed method. The theoretical analysis demonstrated that the stable region would expand along with the increase of the order of accuracy and the proposed explicit method was unconditionally stable when remaining the infinite order of accuracy. Finally, the validity of the proposed method was tested by a numerical example and it is shown that the numerical results agree quite well with the anterior theoretical analysis. And it also reveals the relationship between the stability and the accuracy, and provides the advisory principle for the development of the high-performance computational schemes.

  • Journal article
    Hopcroft PO, Gallagher K, Pain CC, 2007,

    Inference of past climate from borehole temperature data using bayesian reversible jump markov chain monte carlo

    , GEOPHYSICAL JOURNAL INTERNATIONAL, Vol: 171, Pages: 1430-1439, ISSN: 0956-540X
  • Journal article
    Meloy JR, Neethling SJ, Cilliers JJ, 2007,

    Geometric dispersion of unattached particles in foams

  • Journal article
    Davison T, Collins GS, 2007,

    The effect of the oceans on the terrestrial crater size-frequency distribution: Insight from numerical modeling

    , METEORITICS & PLANETARY SCIENCE, Vol: 42, Pages: 1915-1927, ISSN: 1086-9379
  • Conference paper
    Farrell PE, Gorman GJ, Piggott MD, Pain CCet al., 2007,

    Some problems with quadratic fitting algorithm for Hessian recovery in the context of anisotropic mesh optimisation

    , International Conference on Adaptive Modeling and Simulation (ADMOS)
  • Journal article
    Meloy JR, Neethling SJ, Cilliers JJ, 2007,

    Modelling the axial dispersion of particles in froths

    , INTERNATIONAL JOURNAL OF MINERAL PROCESSING, Vol: 84, Pages: 185-191, ISSN: 0301-7516
  • Journal article
    Zhou JT, Lin JG, Xie ZH, 2007,

    Compact explicit difference scheme of high accuracy for extended boussinesq equations

    , China Ocean Engineering, Vol: 21, Pages: 507-514, ISSN: 0890-5487

    Presented here is a compact explicit difference scheme of high accuracy for solving the extended Boussinesq equations. For time discretization, a three-stage explicit Runge-Kutta method with TVD property is used at predicting stage, a cubic spline function is adopted at correcting stage, which made the time discretization accuracy up to fourth order; For spatial discretization, a three-point explicit compact difference scheme with arbitrary order accuracy is employed. The extended Boussinesq equations derived by Beji and Nadaoka are solved by the proposed scheme. The numerical results agree well with the experimental data. At the same time, the comparisons of the two numerical results between the present scheme and low accuracy difference method are made, which further show the necessity of using high accuracy scheme to solve the extended Boussinesq equations. As a valid sample, the wave propagation on the rectangular step is formulated by the present scheme, the modelled results are in better agreement with the experimental data than those of Kittitanasuan.

  • Conference paper
    Bland PA, Artemieva NA, Bussey DBJ, Collins GS, Joy KHet al., 2007,

    Survival of asteroidal impactor material on the moon

    , 70th Annual Meeting of the Meteoritical-Society, Publisher: WILEY-BLACKWELL, Pages: A19-A19, ISSN: 1086-9379
  • Journal article
    Lin JG, Xie ZH, Zhou JT, 2007,

    Three-point explicit compact difference scheme with arbitrary order of accuracy and its application in CFD

    , Applied Mathematics and Mechanics (English Edition), Vol: 28, Pages: 943-953, ISSN: 0253-4827

    Based on the successive iteration in the Taylor series expansion method, a three-point explicit compact difference scheme with arbitrary order of accuracy is derived in this paper. Numerical characteristics of the scheme are studied by the Fourier analysis. Unlike the conventional compact difference schemes which need to solve the equation to obtain the unknown derivatives in each node, the proposed scheme is explicit and can achieve arbitrary order of accuracy in space. Application examples for the convection-diffusion problem with a sharp front gradient and the typical lid-driven cavity flow are given. It is found that the proposed compact scheme is not only simple to implement and economical to use, but also is effective to simulate the convection-dominated problem and obtain high-order accurate solution in coarse grid systems. © 2007 Editorial Committee of Appl. Math. Mech.

  • Journal article
    Piggott MD, Pain CC, Gorman GJ, Killworth PD, Marshall DP, Allison PA, Umpleby AP, Cotter CJ, Fang F, Bricheno LM, West LJ, Johnson HL, Munday DR, Ham DA, Liu H, Kramer SC, Bond TM, Soufflet Y, Shipton J, Wells MR, Candy AS, Bain C, Roberts ZL, Martin BT, Farrell PE, Mitchell AJ, Shravat A, Tukova S, de Oliveira CRE, Goddard AJHet al., 2007,

    Multi-scale ocean modelling with adapting unstructured grids

    , CLIVAR Exchanges, Vol: 12, Pages: 21-23, ISSN: 1026-0471
  • Journal article
    Lin J, Xie Z, Zhou J, 2007,

    High-order compact difference scheme for the regularized long wave equation

    , Communications in Numerical Methods in Engineering, Vol: 23, Pages: 135-156, ISSN: 1069-8299

    A numerical simulation of the regularized long wave (RLW) equation is obtained using a high-order compact difference method, based on the fourth-order compact difference scheme in space and the fourth-order Runge-Kutta method in time integration. The method is tested on the problems of propagation of a solitary wave, interaction of two positive solitary waves, interaction of a positive and a negative solitary wave, the evaluation of Maxwellian pulse into stable solitary waves, the development of an undular bore and the solitary waves induced by boundary motion. The three invariants of the motion are calculated to determine the conservation properties of the algorithm. L2 and L∞ error norms are used to measure differences between the exact and numerical solutions. The results obtained by proposed method are compared with those of other recently published methods and shown to be more accurate and efficient. Copyright © 2006 John Wiley & Sons, Ltd.

  • Journal article
    Stekl I, Warner MR, Umpleby AP, 2007,

    3D frequency domain waveform inversion - Synthetic shallow channel example

    , 69th European Association of Geoscientists and Engineers Conference and Exhibition 2007: Securing The Future. Incorporating SPE EUROPEC 2007, Vol: 2, Pages: 893-897

    We are presenting a first example of 3D frequency domain acoustic inversion applied to a synthetics data over a shallow channel. High resolution images are obtained in less than a day CPU time using inexpensive hardware by utilizing a point iterative solver for wave equation modelling part of the code and multi shot approach. Tests have shown that it is possible to combine multiple shot positions and reduce time required for computation dramatically. Final recovered velocities are within 4% of the true velocity once and spatial positioning I quite well. We did not use any apriori information on anomaly position nor size.

  • Journal article
    Warner M, Stekl I, Umpleby A, 2007,

    Full wavefield seismic tomography - Iterative forward modelling, in 3D

    , 69th European Association of Geoscientists and Engineers Conference and Exhibition 2007: Securing The Future. Incorporating SPE EUROPEC 2007, Vol: 2, Pages: 888-892

    We have developed an efficient iterative solver for the 3D, two-way, acoustic wave equation, and demonstrate its use for 3D wavefield tomography on a synthetic seismic model. Using composite shots for the tomography, the method is sufficiently fast that it can be used to image realistic-sized field datasets.

  • Journal article
    Ham DA, Kramer SC, Stelling GS, Pietrzak Jet al., 2007,

    The symmetry and stability of unstructured mesh C-grid shallow water models under the influence of Coriolis

    , Ocean Modelling, Vol: 16, Pages: 47-60, ISSN: 1463-5003

    The symmetry and stability properties of two unstructured C-grid discretisations of the shallow water equations are discussed. We establish that a scheme in which the circumcentres of the mesh triangles are used as the surface elevation points has advantageous symmetry properties and derive a Coriolis discretisation which preserves these properties. It is shown that the resulting scheme is conservative in a discretised energy norm. We then establish that schemes in which the water surface elevations are stored at the mesh triangle centroids do not share these advantageous symmetry properties. Finally we show examples which demonstrate that the centroid based scheme is subject to unstable growing modes, particularly in long timescale, Coriolis dominated problems; while the energy conservative circurricentre based scheme suffers from no such limitation. We conclude that unstructured C-grid methods using the triangle circumcentres and the conservative Coriolis scheme derived here therefore have advantages for this sort of problem over those schemes based on centroids. (c) 2006 Elsevier Ltd. All rights reserved.

  • Conference paper
    Latham JP, Munjiza A, Garcia X, Xiang Jet al., 2007,

    Highly resolved particle shape for DEM and FEM/DEM simulation

    , Fourth International Conference on Discrete Element Methods
  • Conference paper
    Xiang J, Munjiza A, Latham JP, 2007,

    On the validation of DEM and FEM/DEM models in 2D and 3D

    , Fourth International Conference on Discrete Element Methods
  • Report
    Fang F, Pain CC, Piggott MD, Gorman GJ, Goddard AJHet al., 2007,

    Data assimilation of three-dimensional free surface flow using an adaptive adjoint method: Part 1: Adjoint model formulation.

    , Imperial College London
  • Conference paper
    Guises R, Munjiza A, Xiang J, Latham JPet al., 2007,

    Granular packing: numerical simulation and the characterisation of the effect of particle shape

    , Fourth International Conference on Discrete Element Methods
  • Conference paper
    Gomes JLMA, Pain CC, de Oliveira CRE, Goddard AJHet al., 2007,

    A Numerical Investigation of Heat Transfer Mechanisms in Gas-Solid Fluidized Beds using the Two-Fluids Granular Temperature Model

    , Pages: 576-597
  • Report
    Fang F, Pain CC, Piggott MD, Gorman GJ, Goddard AJHet al., 2007,

    Data assimilation of three-dimensional free surface flow using an adaptive adjoint method: Part 2

    , Imperial College London
  • Conference paper
    Sech RP, Jackson MD, Hampson GJ, 2007,

    Controls on water cresting in high-productivity horizontal gas wells (SPE 107169)

    , SPE Europec/EAGE Annual Conference
  • Journal article
    Wells MR, Allison PA, Piggott MD, Gorman GJ, Hampson GJ, Pain CC, Fang Fet al., 2007,

    Numerical modeling of tides in the late Pennsylvanian Midcontinent seaway of North America with implications for hydrography and sedimentation

    , JOURNAL OF SEDIMENTARY RESEARCH, Vol: 77, Pages: 843-865, ISSN: 1527-1404

    A novel numerical model (the Imperial College Ocean Model, ICOM) is used to simulate tidal circulation in shallow epicontinental seas connected to large, open oceans. ICOM is validated using the present-day North Sea and applied to predict tidal range in the late Pennsylvanian Midcontinent Seaway (LPMS) of North America. The model simulates the effect of the principal tidal constituents (astronomical tides) as well as the tide propagating from the adjacent open ocean (co- oscillating tide). Two ‘‘base-case’’ Pennsylvanian paleogeographies were tested: (1) a maximum sea-level highstand and (2) the early stages of a transgression. Sensitivity tests determined the importance of paleo-water depth and coastline uncertainty on the prediction of tidal range. During the highstand, tidal ranges in the craton interior (Midcontinent Shelf, Illinois and Appalachian basins) are consistently predicted as microtidal (, 2 m tidal range). Such low tidal ranges would have inhibited water-body mixing in the LPMS, promoting stratification. This, combined with the influx of oxygen-poor water from the Permian Basin to the west and high organic input from tropical rivers, may have contributed to the deposition of ‘‘core’’ black shales in LPMS cyclothems. Conversely, a mesotidal to macrotidal diurnal (once-daily tide) regime is predicted for the early transgression in a large-scale embayment in eastern Kansas due to resonant amplification of diurnal tidal constituents. Pennsylvanian strata here have been ascribed to a mesotidal to macrotidal setting and include cyclic rhythmites that suggest a strongly diurnal system, as predicted by ICOM.

  • Conference paper
    Latham JP, Munjiza A, Mindel J, Xiang J, Guises R, Pain C, Gorman G, Garcia Xet al., 2007,

    Towards simulation of concrete armour unit breakage under wave loads using coupled DEM, FEM/DEM and CFD

    , Fourth International Conference on Discrete Element Methods
  • Conference paper
    Choi K, Jackson MD, Hampson GJ, Jones A, Reynolds Tet al., 2007,

    Impact of heterogeneity on flow in fluvial-deltaic reservoirs: Implications for the giant ACG Field, south Caspian Basin (SPE 107137)

    , SPE Europec/EAGE Annual Conference, Publisher: Society of Petroleum Engineers paper 107137
  • Conference paper
    Farrell PE, Gorman GJ, Piggott MD, Pain CCet al., 2007,

    Quadratic fitting for Hessian recovery and anisotropic mesh optimisation

    , Barcelona, Spain, ADMOS 2007 - International Conference on Adaptive Modeling and Simulation, Publisher: International Center for Numerical Methods in Engineering (CIMNE), Pages: 101-104
  • Journal article
    Gorman GJ, Piggott MD, Pain CC, 2007,

    Shoreline approximation for unstructured mesh generation

    , Computers & Geosciences, Vol: 33, Pages: 666-677
  • Journal article
    Brett CE, Allison PA, Tsujita CJ, Soldani D, Moffat HAet al., 2006,

    Sedimentology, taphonomy, and paleoecology of meter-scale cycles from the Upper Ordovician of Ontario

    , PALAIOS, Vol: 21, Pages: 530-547, ISSN: 0883-1351
  • Journal article
    Allison PA, Wells MR, 2006,

    Circulation in large ancient epicontinental seas: What was different and why?

    , PALAIOS, Vol: 21, Pages: 513-515, ISSN: 0883-1351
  • Journal article
    Goldin TJ, Wunnemann K, Melosh HJ, Collins GSet al., 2006,

    Hydrocode modeling of the Sierra Madera impact structure

    , METEORIT PLANET SCI, Vol: 41, Pages: 1947-1958, ISSN: 1086-9379
  • Journal article
    Power PW, Pain CC, Piggott MD, Fang F, Gorman GJ, Umpleby AP, Goddard AJH, Navon IMet al., 2006,

    Adjoint A Posteriori Error Measures for Anisotropic Mesh Optimisation

    , Computers & Mathematics with Applications, Vol: 52, Pages: 1213-1242
  • Journal article
    Neethling SJ, 2006,

    Effect of simple shear on liquid drainage within foams (vol 73, pg 061408, 2006)

    , PHYSICAL REVIEW E, Vol: 74, ISSN: 1539-3755
  • Journal article
    Singer J, Saunders J, Holloway L, Stoll JB, Pain C, Stuart-Bruges W, Mason Get al., 2006,

    Electrokinetic logging has the potential to measure permeability

    , PETROPHYSICS, Vol: 47, Pages: 427-441, ISSN: 1529-9074
  • Journal article
    Latham J-P, Lienhart D, Dupray S, 2006,

    Rock quality, durability and service life prediction of armourstone

    , ENGINEERING GEOLOGY, Vol: 87, Pages: 122-140, ISSN: 0013-7952
  • Journal article
    Latham J-P, Van Meulen J, Dupray S, 2006,

    Prediction of fragmentation and yield curves with reference to armourstone production

    , ENGINEERING GEOLOGY, Vol: 87, Pages: 60-74, ISSN: 0013-7952
  • Journal article
    Higgs R, Wells MR, Allison PA, Piggott MD, Pain CC, Hampson GJ, de Oliveira CREet al., 2006,

    Discussion on large sea, small tides: the Late Carboniferous seaway of NW Europe

    , JOURNAL OF THE GEOLOGICAL SOCIETY, Vol: 163, Pages: 893-895, ISSN: 0016-7649
  • Journal article
    Saunders JH, Jackson MD, Pain CC, 2006,

    A new numerical model of electrokinetic potential response during hydrocarbon recovery

  • Journal article
    Wang Y, Neethling SJ, 2006,

    Simulating realistic froth surfaces

    , MINERALS ENGINEERING, Vol: 19, Pages: 1069-1076, ISSN: 0892-6875
  • Conference paper
    Bland PA, Jackson MD, Coker RF, Cohen BA, Benedix GKet al., 2006,

    Why asteroidal alteration was isochemical: High porosity not equal high permeability

    , 69th Annual Meeting of the Meteoritical Society, Pages: A22-A22, ISSN: 1086-9379

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