Grid Project: SALT Hexahedral Tunnel

Grid Team Member:	Terry Miller
Version:	3D Hex Mesh
Delivered To:	Sharad Kelkar
Date:	September 2014

Version History

Version	Scope	Finished	Total
V1 Hex	.2 ft at tunnel	Sep 2014	353,241 Nodes	337,920 Hex Elements
V0 Coarse	.8 ft at tunnel	Sep 2014	88,711 Nodes	80,640 Hex Elements

Purpose of Project

Build a hexahedral mesh representing a tunnel. Lower Left corner is a 8x80 foot tunnel, mesh expands out to 200 ft in xz, and 80 ft in y. Target resolution along tunnel walls near .1 then .5 at 40, ratio as needed to outside of mesh. Tunnel is empty of elements.
The goal is 100,000 nodes but is not possible with .1 for 8 feet resolution. This version mesh has .2 feet spacing at tunnel then expands in size space quickly toward Y axis and in XZ

3D Tunnel Hex Mesh Full

3D Mesh Tunnel

V1 Hexahedral Tunnel Mesh

This is a 8x80 foot tunnel with mesh out to 200 ft in xz, and 80 ft in y. Target resolution along tunnel walls near .1 then .5 at 40, ratio to big to outside. Tunnel is empty of elements. This version mesh has .2 feet spacing at tunnel then expands in size space quickly toward Y axis and in XZ.

Images of Tunnel V1 and coarse V0 Mesh

README.txt Mesh Description


number of nodes =        360450        
number of hex elements = 344960    
min aspect ratio =  0.8314E+00  max aspect ratio =  0.1000E+01
min volume       =   8.5000000E-02  max volume   =  6.4000000E+02

V1 FEHM Mesh Files (fehm will have to generate the stor file):

Mesh Directory: /scratch/sft/tam/demos/salt_box_lgi

-rwxr-xr-x 1 tamiller sft  50774084 Sep 30  2014 hex_m.fehmn
-rwxr-xr-x 1 tamiller sft   3964995 Sep 30  2014 hex_m_material.zone
-rwxr-xr-x 1 tamiller sft        12 Sep 30  2014 hex_m_outside.zone
-rwxr-xr-x 1 tamiller sft        12 Sep 30  2014 hex_m_outside_vor.area

Tet version stor file converted from hex:
-rwxr-xr-x 1 tamiller sft  84366940 Sep 30  2014 hextotet.stor

V0 Coarse version Hexahedral Tunnel Mesh

This is a 8x80 foot tunnel with mesh out to 200 ft in xz, and 80 ft in y Resolution along tunnel walls is .8 and increases outward.

Images of Tunnel V1 and coarse V0 Mesh


number of nodes =        88711        
number of hex elements = 80640      
min aspect ratio =  0.8314E+00  max aspect ratio =  0.1000E+01
min volume       =   8.5000000E-02  max volume   =  6.4000000E+02

V0 FEHM Mesh Files:

Mesh Directory: /scratch/sft/tam/demos/salt_box_lgi/vers_coarse

-rwxr-xr-x 1 tamiller sft 12185255 Sep 30  2014 hex_m.fehmn
-rwxr-xr-x 1 tamiller sft   975866 Sep 30  2014 hex_m_material.zone
-rwxr-xr-x 1 tamiller sft       12 Sep 30  2014 hex_m_outside.zone
-rwxr-xr-x 1 tamiller sft       12 Sep 30  2014 hex_m_outside_vor.area

Data Sources


Design provided by Sharad Kelkar

Meshing Method:


Create the 2D quad surface on XZ plane
  lagrit < surf_quad.lgi

Extrude and stack into hex mesh
  write_hex_lgi.py > hex.lgi
  lagrit < hex.lgi

Check result
grep Dudd outx3dgen

remove zero volumes and write final files
  lagrit < hex_final.lgi

Check result
grep exterior outx3dgen 
should result with:    1  different exterior boundary components

Grid Team Contacts

Carl Gable	gable -at- lanl -dot- gov	505-665-3533
Terry Miller	tamiller -at- lanl -dot- gov	505-667-8009