FEA Mesh Generation Commands

The best way to generate an FEA mesh is to use Keypoint, Path, and Area commands.

Scripted Input Files

In scripted input files, you build the mesh by using multiple mesh generation commands. These commands are usually grouped together, but may be at various locations in the input file. For example, a simple 2D, rectangular mesh of width #length, height #height, and thickness #thick with #horiz elements in the horizontal direction and #vert elements in the vertical direction (where terms beginning in number signs are script variables) can be created with:

Area #matname$,#thick
  Path "Bottom",#horiz
    Keypoint "BotLeft",0,0
    Keypoint "BotRight",#length,0
  EndPath
  Path "Right",#vert
    Keypoints "BotRight"
    Keypoint "TopRight",#length,#height
  EndPath
  Path "Top",#horiz
    Keypoints "TopRight"
    Keypoint "TopLeft",0,#height
  EndPath
  Path "Left",#vert
    Keypoints "TopLeft","BotRIght"
  EndPath
EndArea
Resequence "BotRight"

Basic Commands

The fundamental commands for generating a mesh are

• Area: Define an area for mesh generation.
• Path: Define a path used in defining areas.
• Paths: Add multiple defined paths to an area.
• Keypoint: Define a keypoint used in defining paths
• Keypoints: Add multiple defined keypoints to a path.

Mesh Attribute Commands

• Element Command: Define type of element to use in the mesh.
• FlipTriangles Command: Select the direction of triangular elements in meshes that use those elements.
• Origin Command: Define the coordinate system origin for entry of keypoints using polar coordinates.
• Resequence Command: To turn on the option to resequence the nodes, which will minimize the bandwidth of the problem and speed the calculations.

XML Input Files

In XML input files, you build the mesh with mesh generation commands that must be within a single <Mesh> block. Here is a <Mesh> block that creates at 50X10 mm rectangular mesh with 6 elements in the horizontal direction and 3 in the vertical direction:

<Mesh>
  <Keypoints>
    <pt x='0' y='0' id='lowerleft'/>
    <pt x='0' y='10' id='upperleft'/>
    <pt x='50' y='0' id='lowerright'/>
    <pt x='50' y='10' id='upperright'/>
  </Keypoints>

  <Path id="bottom" intervals='6' ratio='1'>
    <keypt id='lowerleft'/>
    <keypt id='lowerright'/>
  </Path>
  <Path id="right" intervals='3'>
    <keypt id='lowerright'/>
    <keypt id='upperright'/>
  </Path>
  <Path id="top" intervals='6'>
    <keypt id='upperright'/>
    <keypt id='upperleft'/>
  </Path>
  <Path id="left" intervals='3'>
    <keypt id='upperleft'/>
    <keypt id='lowerleft'/>
  </Path>

  <Area mat="1" thick="10" type="4" flip="0" angle="0">
    <path id="bottom"/>
    <path id="right"/>
    <path id="top"/>
    <path id="left"/>
  </Area>
</Mesh>

Mesh Generation Commands

The fundamental XML commands for generating a mesh are:

• <Area>: Define an area for mesh generation.
• <Path>: Define a path used in defining areas.
• <Keypoints>: Define a key point used in defining paths

Using Images and Shapes

If some elements in the generate mesh are set the material id _NONE_ (see Area Command) or mat = 0 (see <Area> Command), you can follow mesh creation with image and shape commands to fill in material types, angles, and define the final mesh geometry. This option is described here.

Notes

1. Once the mesh is created, an optional method to create complicated meshes is to define the materials, angles, and final geometry using images and shapes. This meshing method is described elsewhere.