Fast Flow Computation Methods On Unstructured Tetrahedral Meshes For Rapid Reservoir Modelling

Zhang, Z.; Geiger, Sebastian; Rood, Margaret; Jacquemyn, Carl; Jackson, M.; Hampson, Gary J.; Calvalho, F.M. De; Silva, C.C.M. Machado; Silva, J. Machado; Sousa, Mário Costa

doi:10.3997/2214-4609.201802241

Proceedings

2018

DOI: 10.3997/2214-4609.201802241

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Fast Flow Computation Methods On Unstructured Tetrahedral Meshes For Rapid Reservoir Modelling

Z. Zhang¹,

Sebastian Geiger²,

Margaret Rood

et al.

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“…Geological domains, bounded by surfaces, can be defined without reference to an underlying grid or mesh (e.g. Jacquemyn et al 2019), although a mesh may be created that conforms to the modelled surfaces when a numerical calculation is required (Jackson et al 2015a;Zhang et al 2018). The emphasis on surfaces and surface-bounded domains closely matches how geoscientists conceptualize and represent geological interpretations in traditional tools such as maps, crosssections and block diagrams.…”

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confidence: 99%

Sketch-based interface and modelling of stratigraphy and structure in three dimensions

Jacquemyn

Pataki

Hampson

et al. 2021

JGS

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Geological modelling is widely used to predict resource potential in subsurface reservoirs. However, modelling is often slow, requires use of mathematical methods that are unfamiliar to many geoscientists and is implemented in expert software. We demonstrate here an alternative approach using Sketch-Based Interface and Modelling (SBIM) that allows rapid creation of complex three-dimensional (3D) models from 2D sketches. Sketches, either on vertical cross-sections or in map-view, are converted to 3D surfaces that outline geological interpretations. A suite of geological operators is proposed that handle interactions between the surfaces to form a geologically realistic 3D model. These operators deliver the flexibility to sketch a geological model in any order and provide an intuitive framework for geoscientists to rapidly create 3D models. Two case studies are presented, demonstrating scenarios in which different approaches to model sketching are used depending on the geological setting and available data. These case studies show the strengths of sketching with geological operators. Sketched 3D models can be queried visually or quantitatively to provide insights into heterogeneity distribution, facies connectivity or dynamic model behaviour; this information cannot be obtained by sketching in 2D or on paper.Supplementary material:https://doi.org/10.6084/m9.figshare.c.5303043

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confidence: 99%

Sketch-based interface and modelling of stratigraphy and structure in three dimensions

Jacquemyn

Pataki

Hampson

et al. 2021

JGS

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Extension of a Non-Oscillatory Forward-in-Time Scheme to Detached Eddy Simulation of Stratified Turbulent Flows With Unstructured Meshes

Zhang

2019

IEEE Access

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A detached eddy simulation algorithm is developed based on the non-oscillatory forwardin-time (NFT) multidimensional positive definite advection transport algorithm (MPDATA) scheme for stratified turbulent flows with low or moderate Reynolds numbers on unstructured meshes. NFT MPDATA is extended to viscous turbulent flows for the first time. Viscous diffusion terms and an explicit sub-gridscale model are included. The working viscosity of the modified Spalart-Allmaras one equation model is transported by an algorithm based on the NFT MPDATA template. The scheme is semi-implicit which solves the linear equation system once per time step. The advantage of the scheme is efficiency and second-order accuracy. Furthermore, an edge-based data structure is adopted such that our scheme is suitable for both structured and unstructured meshes. The linear equation system is solved by an efficient algebraic multigrid (AMG) method. The algorithm is validated using test cases with Reynolds numbers 200 and 5000 over a range of Froude numbers. The flow patterns and dynamic drag coefficients are analysed and compared to numerical and experimental data in literature. INDEX TERMS Non-oscillatory forward-in-time, unstructured mesh, control volume, stratified turbulent flow.

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Fast Flow Computation Methods On Unstructured Tetrahedral Meshes For Rapid Reservoir Modelling

Cited by 2 publications

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Sketch-based interface and modelling of stratigraphy and structure in three dimensions

Sketch-based interface and modelling of stratigraphy and structure in three dimensions

Extension of a Non-Oscillatory Forward-in-Time Scheme to Detached Eddy Simulation of Stratified Turbulent Flows With Unstructured Meshes

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