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 1. DDSTE
 2. ALDCELS
 3. EES Division
 4. Meshing


MESHING

FOR GEOLOGIC APPLICATIONS

 * Index of Meshing Projects
 * Demos
 * LaGriT
 * Pubs

Our meshing projects represent a wide variety of geological applications where
accurate representation of complex engineering systems and geologic structure
and stratigraphy is critical to producing accurate numerical models of fluid
flow and mass transport. Oil and gas reservoir production, groundwater resource
development and waste disposal in a geologic repository are examples of the
areas where modeling is used to predict the long term behavior of a system. In
all the systems, mesh generation is a key link between the geoscientific
information systems and numerical models. The mesh must capture complex geometry
and insure the computationals are optimized to produce accurate and stable
solutions.

LaGriT (Los Alamos Grid Toolbox) mesh generation software is used for providing
mesh generation and model setup. It is used for models with multi-material
complex geometries to understand and solve subsurface flow and transport
problems not only for earth science applications, but any system that requires
requires a mesh and intitial boundary conditions, setting of material
properties, and other model setup functions. LaGriT has been used to support
various modeling applications including FEHM, Amanzi/ATS, PFLOTRAN, and TOUGH2.

For more details refer to the Geo Meshing Overview (PDF).

CONTACTS

General Help
lagrit-dev@lanl.gov

Meshing Team

DEVELOPMENT TEAM CONTACT

×
Carl W. Gable

LAGRIT TEAM LEADER
AND EES-16 GROUP LEADER

gable@lanl.gov
Gable Profile Page
Terry A. Miller

DEVELOPMENT AND DISTRIBUTION

tamiller@lanl.gov
Miller Profile Page
Daniel R. Livingston

LAGRIT INSTALLATION AND GITHUB,
PYLAGRIT, AND TINERATOR

livingston@lanl.gov
Livingston Profile Page
Dylan R. Harp

PYLAGRIT

dharp@lanl.gov
Harp Profile Page

MESHING PROJECTS

 * CO2, Oil and Gas, Reservoir Modeling
 * Watershed and Arctic
 * ASCEM
 * Salt Repository Science
 * Environmental Restoration at Los Alamos and Savannah River

 * Discrete Fracture Networks (DFN)
 * Southern California Earthquake Center (SCEC)
 * Semiconductor Design and High Speed Hydrodynamics
 * Yucca Mountain Site Characterization Project (YMP)
 * Nevada Test Site Underground Test Area Flow and Transport Modeling

Examples of meshing projects with embedded features clockwise from top; SALT
with canister in a room, ASCEM large area mesh with faults, UGTA area mesh with
faults, tunnels, and cavities. These were created with LaGriT.

Close

Examples showing 2D and 3D unstructured meshes conforming to geology and fault
features using LaGriT.

Close

LaGriT refinement examples from top to bottom include; geometric spacing, octree
refinement, unstructured refinement.

Close


MESHING SOFTWARE

LAGRIT : LOS ALAMOS GRID TOOLBOX

LaGriT LaGriT is a software tool for generating, editing and optimizing
multi-material unstructured finite element grids; it also maintains the
geometric integrity of complex input volumes, surfaces, and geologic data and
produces an optimal grid (Delaunay, Voronoi) elements. The data structures used
in the code are compact and powerful and expandable to include hybrid meshes
(tet, hex, prism, pyramid, quadrilateral, triangle, line), however the main
algorithms are for triangle and tetrahedral meshes.
LaGriT is open source and available at Github

PYLAGRIT : SCRIPTED LAGRIT INTERFACE

The PyLaGriT module allows LaGriT commands to be accessed interactively and in
batch mode from Python. Common and useful meshing workflows are combined into a
set of higer level python calls which also enables loops and better parameter
control.

GRIDDER : RECTANGULAR GRID GENERATOR

GRIDDER: is rectangular grid generator that creates structured grids in a format
used by FEHM.

VORONOI : TESSELATION CONTROL VOLUMES

Voronoi is a parallel and scalable program for writing Voronoi tessellation
control volumes (connectivity graph, control volume areas/volumes) from a
Delaunay Tet or Tri mesh. Files are compatible with: FEHM, PFLOTRAN, TOUGH2, and
HDF5.

VOROCRUST : VORONOI MESHING

VoroCrust Meshing Without Clipping is the first provably correct algorithm for
conforming Voronoi meshing for non-convex and possibly non-manifold domains with
guarantees on the quality of both surface and volume elements. It provides a
robust polyhedral meshing that can handle broad classes of domains exhibiting
arbitrary curved boundaries and sharp features.
Abstract



LAGRIT APPLICATIONS

DFNWORKS : DISCRETE FRACTURE NETWORK WORKFLOW

dfnWorks is a parallelized computational suite to generate three-dimensional
discrete fracture networks (DFN) and simulate flow and transport. dfnWorks
creates high-fidelity three-dimensional networks dfnGen, which combine FRAM (the
feature rejection algorithm for meshing) methodology to stochastically generate
three-dimensional DFNs with the LaGriT meshing toolbox to create a high-quality
computational mesh representation.

TINERATOR : PYTHON/GIS WORKFLOW FOR STACKED TRIANGULATIONS

TINerator takes advantage of LaGriT mesh commands combined with GIS data to
triangulate and stack a 3D mesh.
Currently available at: Docker


ASSORTED LINKS

GALLERY : OF MESHING IMAGES

Gallery of recent projects.
Gallery of early meshing projects.
Gallery of assorted meshing images.


VISUALIZATION SOFTWARE

Software often used with LaGriT input and output files include:
ParaView
VISIT
Tecplot
AVS (Advanced Visual Systems)
GMV (General Mesh Viewer)


Software for Voronoi Meshes :
Voro++ reads VoroCrust output files to compute the Voronoi cells as polyhedrons
and write image and statistics files.



LANL EES Meshing Projects Since December 1996

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