Grid Project:   Barrow Ice Wedge Polygon 40 V2 (fine scale)

Grid Team Member: Lucia Short
Grid Version: Version 02: single polygon #40
Data Source: LiDAR from Area C
Delivered To: Scott Painter
Date Completed: June 3 2013
V1 Mesh Nodes and Cells:   51,344     94,080
V2 Mesh Nodes and Cells: 311,273    602,112

Purpose of Project

These meshes were developed in support of the Arctic Next Generation Ecosystem Experiment (NGEE-Arctic) Project and LANL Laboratory Directed project LDRD20120068DR. These two projects share a need for high quality computational meshes for use in fine-scale modeling of thermal hydrology in ice-wedge polygon landscapes.

Version 2 is a modification of the Version 1 mesh which is a 3D mesh polygon based on single polygon #40 generated using LiDAR data set (area C). This mesh has changes to V1 based on the Mesh Input Parameters below. It has increased vertical resolution and a flat bottom. The convention of layer order was also changed so that numbering is from top to bottom. Two Exodus II mesh files are written, one multi-material with ice, and one single material.

Full Stacked Mesh with Ice Wedge

LaGriT Finite Element Mesh

Full Stacked Mesh with Ice Wedge
Cut to show internal materials

LaGriT Finite Element Mesh

Mesh and Ice Wedge
with moss and organic layers removed

LaGriT Finite Element Mesh

Ice Wedge

LaGriT Finite Element Mesh

Mesh Input Parameters V2

General Description

Same as V01 using Polygon #40 with the following modifications:

Material Ice Wedge

We want the top of the ice wedge to be at 50 cm depth (corresponds to the top of the inorganic layer).

Top of wedge starts at top of mineral layer (exists in material 4 and 5)

Top wedge width (distance from polygon) is aprox 1.2

Depth from top of ice to tip is aprox 2.8

Outside Boundaries (Exodus side sets)

The side sets defined are top, bottom, and sides (corresponding to the 4 sectors within 45 degrees of each direction).

Output Mesh Description

Output is a stacked prism mesh written as two Exodus files; a single material mesh and a multi-material Mesh with 6 materials (5 layers plus the Ice Wedge). Files are written in formats; Exodus II (.exo), AVS (.inp), and GMV (.gmv)
Final Mesh files: 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

Mesh Element Type:             prism
Mesh Software Used: LaGriT, ExodusII

Mesh Extents (Meters):
         MIN              MAX              DIFFERENCE
 x    4.634709930E+01  7.183999634E+01   2.549289703E+01     
 y    1.062200012E+02  1.326065216E+02   2.638652039E+01     
 z   -1.000000000E+00  4.992260933E+00   5.992260933E+00     

Color      Num. Elements   Volume          Fractional Volume                    
    1       12544          0.7936425E+01     0.003490890                        
    2       75264          0.9523729E+02     0.041890767                        
    3       75264          0.9523710E+02     0.041890684                        
    4       95524          0.1464469E+03     0.064415680                        
    5      293616          0.1745817E+04     0.767909504                        
   30       49900          0.1827924E+03     0.080402475                        

LAYER     MIN              MAX             DIFFERENCE 
  1     4.504300117E+00  4.992260933E+00 4.879608154E-01
  2     4.484300117E+00  4.972260933E+00 4.879608154E-01
  3     4.244300117E+00  4.732260933E+00 4.879608154E-01
  4     4.004300117E+00  4.492260933E+00 4.879608154E-01
  5     3.504300117E+00  3.992260933E+00 4.879608154E-01
  (Bottom is flat at -1.0)

Total nodes:       311273       
Total elements:    602112     
Total Volume:      0.2273467E+04      

* Materials and Cell Layers *

ID Name Cell Height Num Cells Mat Thick
1 moss
(top layer)
0.01 2 0.20
2 upper organic 0.02 12 0.24
3 lower organic 0.02 12 0.24
4 upper mineral 0.025 20 0.5
5 lower mineral 0.09 50 2.2 -
30 ice 0.09 variable 0.00 -
LaGriT Finite Element Mesh

* Boundary Side Sets *

Top and Bottom:
neon-pink  top     (num_side_ss2) has  6272 faces
neon-green bottom  (num_side_ss1) has  6272 faces

LaGriT Finite Element 
red     east right   (num_side_ss3) has  6144 faces
yellow  north back   (num_side_ss4) has  3072 faces
green   west left    (num_side_ss5) has  1536 faces
blue    south front  (num_side_ss6) has  3072 faces
LaGriT Finite Element 
Element Mesh

Project Archive Location

Full Set of files:


tar file sent:
-rw-r--r-- 1 lucia sftus 164147118 Jun  3 11:33 mesh_3D_poly40_v02.tgz

Created from clean subdirectory with mesh files:
drwxr-xr-x 3 lucia sftus     12288 Jun  3 11:27 mesh_final/

LaGriT faceset files from mesh outside surface (elem number and face):
-rw-r--r--  1 lucia sftus     81639 Jun  3 11:12 fs_1_bot.faceset
-rw-r--r--  1 lucia sftus     69095 Jun  3 11:12 fs_2_top.faceset
-rw-r--r--  1 lucia sftus     86119 Jun  3 11:12 fs_3_rig.faceset
-rw-r--r--  1 lucia sftus     43111 Jun  3 11:12 fs_4_bac.faceset
-rw-r--r--  1 lucia sftus     21607 Jun  3 11:12 fs_5_lef.faceset
-rw-r--r--  1 lucia sftus     43111 Jun  3 11:12 fs_6_fro.faceset

Mesh and faceset files for 6 Materials:
-rw-r--r--  1 lucia sftus  26953248 Jun  3 11:12 mesh_fsets.exo
-rw-r--r--  1 lucia sftus  45822656 Jun  3 11:12 mesh_fsets.gmv
-rw-r--r--  1 lucia sftus  89405021 Jun  3 11:12 mesh_fsets.inp

Mesh and faceset files for 1 Material:
-rw-r--r--  1 lucia sftus  26951604 Jun  3 11:12 mesh_fsets_1mat.exo
-rw-r--r--  1 lucia sftus  42678672 Jun  3 11:12 mesh_fsets_1mat.gmv
-rw-r--r--  1 lucia sftus  89093748 Jun  3 11:12 mesh_fsets_1mat.inp

LaGriT output files contain information reported during the run.
-rw-r--r-- 1 lucia sftus  20338 Jun  3 11:12 interpolate_icewedge.out
-rw-r--r-- 1 lucia sftus 110772 Jun  3 11:12 make_poly.out
-rw-r--r-- 1 lucia sftus 261870 Jun  3 11:12 stack_full_poly.out
-rw-r--r-- 1 lucia sftus  77436 Jun  3 11:12 write_exo.out

Mesh images:
drwxr-x--x  2 lucia sftus      4096 Jun  3 11:18 images/
-rw-r--r--  1 lucia sftus     20338 Jun  3 11:12 interpolate_icewedge.out

Input Data files:


 -rw-r--r--  2 lucia sftus 30928912 Apr 18 13:59 lidar_site3.inp
 -rw-r--r--  1 lucia sftus      123 Apr 18 13:59 poly10001.avs
 -rw-r--r--  1 lucia sftus      178 Apr 18 13:59 poly10002.avs 
 -rw-r--r--  1 lucia sftus      155 Apr 18 13:59 poly10071.avs
 -rw-r--r--  1 lucia sftus      190 Apr 18 13:59 poly10072.avs

Main Work Directory for Polygon Meshing Method:



Links to Images and Project Details

Gallery of All Project Images

Method Description Overview (from V01)

Input and Output Files Running LaGriT to create the Mesh

These are LaGriT input (.lgi) and output (outx3dgen) files used in creating this mesh. The output files provide good information about the data and mesh, including min and max values of mesh attributes.
The complete set of scripts and input files are in /scratch/sft2/lucia/grid_gen/arctic/arctic_fine_v2. The output files for various mesh versions are in /scratch/sft2/lucia/grid_gen/arctic/.

Step 1: Create Ice Object from Polygon (make_poly.lgi)     Input       Output

Step 2: Create and stack layers into full mesh (stack_full_poly.lgi)     Input       Output

Step 3: Interpolate Ice Material on to Full Stacked Mesh (interpolate_icewedge.lgi)     Input       Output

Step 4: Create facesets and write final Exodus files (write_exo.lgi)     Input       Output


Grid Team Contacts

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