GDSA Repository Systems Analysis Investigations (FY2020)

LaForce, Tara; Chang, Ken; Perry, Frank V.; Lowry, Thomas Stephen; Basurto, Eduardo; Jayne, Richard; Brooks, Dusty; Jordan, Spencer; Stein, Emily; Leone, Rosemary; Nole, Michael

doi:10.2172/1706226

Cited by 3 publications

(5 citation statements)

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“…The process for creating a Voronoi mesh and converting it for use in PFLOTRAN is discussed in detail in Section 6.3.2 and Appendix C of LaForce et al (2020) and is only briefly summarized here. VoroCrust accepts watertight Wavefront Object (.obj) files as input surfaces for meshing.…”

Section: Mesh Generationmentioning

confidence: 99%

“…PFLOTRAN simulations on VoroCrust Voronoi meshes of these four test structures were later studied by Sevougian et al (2019). LaForce et al (2020) presented PFLO-TRAN simulations on VoroCrust meshes for two analytical benchmark cases and two large-scale models using surfaces from geological mapping software.…”

Section: Introductionmentioning

confidence: 99%

“…Simulations are initially benchmarked against a two-dimensional analytical solution for heat diffusion that has been modified from LaForce et al (2020), and their accuracy is compared against simulations on a flexed hexahedral mesh. Four common reservoir structures are then meshed for further benchmarking.…”

Section: Introductionmentioning

confidence: 99%

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Voronoi Meshing to Accurately Capture Geological Structure in Subsurface Simulations

et al. 2022

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Mesh generation lies at the interface of geological modeling and reservoir simulation. Highly skewed or very small grid cells may be necessary to accurately capture the geometry of geological features, but the resulting poorly scaled or small grid cells can have a substantial negative impact on simulator accuracy and speed. One way to minimize numerical errors caused by gridding complex structures is to simulate on high-quality Voronoi meshes, which reduce grid orientation effects in fluid flow. This work presents a complete methodology to create Voronoi simulation grids, model fluid flow in complex geological systems, and visualize the results. A recently developed Voronoi meshing method that can automatically generate provably good unstructured meshes that conform to input surfaces creating closed volumes is used. Initially an analytical benchmark simulation is presented to validate the quality of the meshes and simulation results and demonstrate the superiority of simulation results using Voronoi meshes over flexed-hexahedral meshes on a domain with internal features. Next, meshes are created for test structures representing four of the most common geological features in the subsurface: layering, pinch-out, an interior lens that tapers to zero thickness on all sides and a fault with offset. Two benchmark flow simulations are run for each test structure. Finally, a realistic geological example for CO$$_2$$ 2 injection into an anticline is simulated. Three realizations of the Voronoi mesh at the same resolution are generated for the simulations. Each mesh is highly refined near the injection wells and coarse in areas of less interest. These three meshes are used to model the CO$$_2$$ 2 plume in the subsurface as it migrates to the top of the structure and then fills downward. Simulations on the meshes with randomly generated elements inside the input volumes each give slightly different fingering patterns for the viscous-unstable buoyant gas flow. The results presented in this work show a promising step towards utilizing fully automated Voronoi meshing for subsurface flow simulations in complex geology.

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Section: Mesh Generationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Voronoi Meshing to Accurately Capture Geological Structure in Subsurface Simulations

et al. 2022

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“…The task provides numerous opportunities for learning new modeling approaches, developing new models for use in PA simulations, testing uncertainty and sensitivity analysis methods, comparing PA methods, and networking with modelers in other programs. Additional information on the structure of and the plans for DECOVALEX-2023 Task F are provided in LaForce et al (2020;.…”

Section: Modeling Of Decovalex Task F Reference Casesmentioning

confidence: 99%

“…An additional option begun three years ago is a potential mined repository in unsaturated alluvium. Activities related to the development and application of PA methods on generic reference test cases reside in the Geologic Disposal Safety Assessment (GDSA) Repository System Analysis (RSA) work package of SFWD (LaForce et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

International Collaboration Activities in Geologic Disposal Research: FY2021 Progress

Birkhölzer¹,

Faybishenko²

2021

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In some cases there may be a milestone where an item is being fabricated, maintenance is being performed on a facility, or a document is being issued through a formal document control process where it specifically calls out a formal review of the document. In these cases, documentation (e.g., inspection report, maintenance request, work planning package documentation or the documented review of the issued document through the document control process) of the completion of the activity, along with the Document Cover Sheet, is sufficient to demonstrate achieving the milestone. NOTE 2:If QRL 1, 2, or 3 is not assigned, then the QRL 4 box must be checked, and the work is understood to be performed using laboratory specific QA requirements. This includes any deliverable developed in conformance with the respective National Laboratory / Participant, DOE or NNSA-approved QA Program.

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Effect of fracture characteristics on groundwater flow adjacent to high-level radioactive waste repository

Yoon,

Han,

Hwang

et al. 2024

Journal of Hydrology

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GDSA Repository Systems Analysis Investigations (FY2020)

Cited by 3 publications

References 0 publications

Voronoi Meshing to Accurately Capture Geological Structure in Subsurface Simulations

Voronoi Meshing to Accurately Capture Geological Structure in Subsurface Simulations

International Collaboration Activities in Geologic Disposal Research: FY2021 Progress

Effect of fracture characteristics on groundwater flow adjacent to high-level radioactive waste repository

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