|Grid Team Member:||Terry Miller|
|Data Source:||LiDAR and polygon data from Chandana and Arctic program|
|Delivered To:||Scott Painter, Rao Garimella, Ethan Coon|
|Date:||December 2013 to present|
|Proto Full 2||Lobster Prism with convex polygons||pending||
|Proto Full||Lobster Prism with Phedra numbers||Sep 22 2015||59,532||113,184|
|Proto 2Poly||Proto Prism of 2 Polys, 3 materials||Sep 20 2015||270||396|
|V03.2||Lobster Quad to 4 Tri Tall||Jan 10 2014||59,532||113,184|
|V03.1||Lobster Quad to 4 Tri||Jan 10 2014||43,747||82,944|
|V02.2||Lobster Quads Tall||Jan 10 2014||34,188||37,859|
|V02.1||Lobster Quads Fixed||Jan 10 2014||25,123||27,744|
|V01||Lobster Quads Proto||Jan 7 2014||25,414||28,608|
This project is for Arctic Intermediate Scale Modeling. These meshes are
developed based on work for fine-scale modeling of thermal hydrology in
ice-wedge polygon landscapes. The conceptual design for these models are
the same as the fine-scale models and are based on observations and data
collected for the Arctic project.
The top surfaces of these models are polygonal tundra shapes and elevations derived from LIDAR data sets.
Each polygon is processed with offsets calculated to represent the half-trough, rim, and center. Each poly ring is converted to quad cells with thickness equal to the defined offsets. The center is filled with cell edges at rim and connecting to a center point. Polygon cells are merged to create a top surface layer. The surface elevations are interpolated from the Lidar data on to each cell vertice point.
The subsurface layers are derived from the top surface to selected depths. These surfaces are stacked and filled with cell volumes with thickness defined by the stacked layers. The layer thickness for each material are based on descriptions and observations of core data. The material layers represented are
moss (part of the active layer)
upper and lower organic
upper, lower, and deep mineral
The methods and data used for these intermediate-scale meshes were developed during design and meshing for the Arctic Fine-scale work. See fine-scale project pages at meshing.lanl.gov/proj/arctic_ice_wedge_poly/index.html
These start with the Arctic polygon meshes used for modeling, but
explore stategies to represent the meshes as column cells with unique
polyhedral id's. Rao Garimella using a prototype code to coalesce elements
of a particular type (material ID, same polyhedral ID, etc) to create
Intermediate scale polygonal meshes for modeling.
Images of Polyhedral Mesh Prototypes
The concave polygons ## 8, 45, and 56 got divided each into 2 polygons such that polygon #8 became ## 8 and 74, #45 => ## 45 and 75, #56 => #56 and 76.
Subset Lobster with 4 convex polygons: ## 8, 74, 6, 9
Local: /scratch/sft2/lucia/grid_gen/arctic/lobster/subset01 Download Archive lobster_convex_proto01.tar.gz ( 0.18 M )
Proto Lobster prism mesh, tall version 3.2 number of nodes: 59532 number of elements: 113184 Mesh attributes: poly_id are the polygons with Arctic polygon id 1-56 layer_id are the single cell layers from bottom to top starting at 0 phedra_id = poly_id(6 to 56) x num_layers(fixed) + layer_id(0 to n) Files include: GMV binary and ascii, AVS, ExodusII (no attributes) .txt attribute arrays, .dat adjacency jtet arrays. *lgi lagrit input files to create the mesh from tri poly surface Full Lobster with all polygons: Local: /scratch/sft/tam/grid_gen/arctic/intermediate_scale/mesh_hex_lobster/stack_quadtotri4_tall/polyhedral_files Download Archive lobster_phedra_prism_tall.tar.gz ( 11 M ) Subset Lobster with 2 polygons: Local: /scratch/sft/tam/grid_gen/arctic/intermediate_scale/mesh_hex_lobster/stack_quadtotri4_tall/polyhedral_files/subset_2poly Download Archive lobster_phedra_2poly.tar.gz ( 1.9 M )
Proto prism with 2 polygons, quad elements converted to 4 triangles each. There are 3 materials and 4 layers. number of nodes: 270 number of elements: 396 matclr is material id (same as GMV itetclr) ring_id for each polygon, 3 = outer edge, 2 = rim middle, 1 = center num_layers are the total number of layers poly_id are the polygons with Arctic polygon 1-56 (may have to sub 10000) layer_id are the single cell layers from bottom to top starting at 0 phedra_id = poly_id(6 to 56) x num_layers(fixed) + layer_id(0 to n) Files include: GMV binary and ascii, AVS, ExodusII (no attributes) .txt attribute arrays, .dat adjacency jtet arrays. Local: /scratch/sft/tam/grid_gen/arctic/intermediate_scale/proto_polyhedral/tri_to_prism_v2/output_files Download Archive proto_phedra_prism.tar.gz ( 411 K )
Proto hex with 2 polygons, quad elements converted so shared center have duplicate nodes This enables the quad and hex elements to have a unique node index rather than repeating. Local: /scratch/sft/tam/grid_gen/arctic/intermediate_scale/proto_polyhedral/quad2_to_hex/output_files Proto Hex 1 with Single Node at degen center. The hex indices have repeated numbers rather than unique numbers from duplicate nodes. Local: /scratch/sft/tam/grid_gen/arctic/intermediate_scale/proto_polyhedral/quad1_to_hex/output_files
Files are available on local servers or you can download the compressed
".tar.gz" archive. See mesh details and locations below.
Mesh Overview and Images
View Gallery of All Mesh Images
|V2 Mesh (Lobster Quads Stacked into Hex) : 259 nodes and 289 quad cells per layer|
This mesh starts with polygons converted to quad cells the same thickness as the polygon offsets. The center polygon is made up of degenerate quad cells which converge at a center point. This strategy has the fewest number of cells and nodes. Two sets of mesh files are written (multi-material and single) in formats: AVS, GMV, and Exodus II.
V2.1 Hex Mesh:
/scratch/sft/tam/grid_gen/arctic/intermediate_scale/mesh_hex_lobster/stack_quad_rmsliversDownload Archive V02.1_stack_quad.tar.gz ( 6.2 MB )
V2.2 Tall Hex Mesh:
/scratch/sft/tam/grid_gen/arctic/intermediate_scale/mesh_hex_lobster/stack_quad_rmsl_tallDownload Archive V02.2_stack_quad_tall.tar.gz ( 7.6 MB )
|V3 Mesh (Lobster Triangles Stacked into Prism) : 451 nodes and 864 triangle cells per layer|
This mesh starts with polygons converted to quad cells the same thickness as the polygon offsets. Each quad cell is converted to 4 triangles with added center point. The degenerate quad cells making up the center piece are converted to triangles sharing a vertice at the center point. Two sets of mesh files are written (multi-material and single) in formats: AVS, GMV, and Exodus II.
V3.1 Prism Mesh:
/scratch/sft/tam/grid_gen/arctic/intermediate_scale/mesh_hex_lobster/stack_quadtotri4Download Archive V03.1_stack_tri.tar.gz ( 14 MB )
V3.2 Tall Hex Mesh:
/scratch/sft/tam/grid_gen/arctic/intermediate_scale/mesh_hex_lobster/stack_quadtotri4_tallDownload Archive V03.2_stack_tri_tall.tar.gz ( 17 MB )
The following definitions apply to all the meshes: Polygons from Site C called extended lobster (adds 56): 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 6, 8, 9, 19, 21, 25, 27, 29, 31, 34, 35, 36, 37, 39, 45, 47, 50, 56 Materials for all grids: 1 Moss (top) 2 Upper Organic 3 Upper Mineral 4 Lower Organic 5 Lower Mineral 6 Deep Mineral Boundary Side Sets (Facesets) for all grids: Top (num_side_ss2) Bottom (num_side_ss1) Side east right (num_side_ss3) Side north back (num_side_ss4) Side west left (num_side_ss5) Side south front (num_side_ss6) Mesh Vertical Layers for all: 1 top at Lidar elevations 1 .02 Thick 2 cells x .01 2 .18 Thick 9 cells x .02 3 .18 Thick 9 cells x .02 4 .12 Thick 6 cells x .02 5 .50 Thick 20 cells x .025 Bottom layers for short: 6 variable thickness with 50 cells near .09 6 bottom at -1. Bottom layers for tall: 6 5. Thick 50 cells x .1 6 4. Thick 10 cells x .4 6 10. Thick 10 cells x 1.0 6 variable thickness with 15 cells near 1.9 6 bottom at -45. Exodus Facesets: 1 Bottom (num_side_ss1) 2 Top (num_side_ss2) 3 Side east right (num_side_ss3) 4 Side north back (num_side_ss4) 5 Side west left (num_side_ss5) 6 Side south front (num_side_ss6) Mesh information can be found in mesh directory in README.txt, RUNS, *.out Mesh Files are written in formats; Exodus II (.exo), AVS (.inp), and GMV (.gmv) Final Top surface for deriving layers: poly_top_surf.inp poly_top_surf.gmv Final Mesh with multi-materials: mesh_fsets.exo, mesh_fsets.gmv, mesh_fsets.inp Final Mesh with single material: mesh_fsets_1mat.exo, mesh_fsets_1mat.gmv, mesh_fsets_1mat.inp
The input data is organized into a set of files that contain data extracted from lidar data. The data set is canonized by Chandana Gangodagamage and organized into a set of input files. These input files include ground surface elevations, polygon shape coordinates, and widths for rims and troughs. Thank you to Craig Tweedie, University of Texas, El Paso, for providing the Lidar data for use in these projects.
NGEE extensive site-C Lidar Elevations with Polygon Id's
ASCII AVS file with elevation for each x,y location:
Lobster Polygons as Quad Cells with Polygon Id's
ASCII AVS file with half-trough and rim widths for each polygon:
|Carl Gable||<gable -at- lanl -dot- gov>||505-665-3533|
|Terry Miller||<tamiller -at- lanl -dot- gov>||505-667-8009|
|Lucia Short||<lucia -at- lanl -dot- gov>||505-665-7957|