Block2D Command: Difference between revisions

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The block2D command generates meshes of quadrilateral elements in two or three dimensions. In three dimensions, a two-dimensional surface appropriate for shell analysis is generated.
The block2D command generates meshes of quadrilateral elements in two or three dimensions. In three dimensions, a two-dimensional surface appropriate for shell analysis is generated.
{| style="background:yellow; color:black; width:800px"
| '''block2d $nx $ny $e1 $n1 element elementArgs  {'''
|-
| '''1 $x1 $y1 <$z1>'''
|-
| '''2 $x2 $y2 <$z2>'''
|-
| '''3 $x3 $y3 <$z3>'''
|-
| '''4 $x4 $y4 <$z4>'''
|-
| '''<5> <$x5> <$y5> <$z5>'''
|-
| '''<6> <$x6> <$y6> <$z6>'''
|-
| '''<7> <$x7> <$y7> <$z7>'''
|-
|'''<8> <$x8> <$y8> <$z8>'''
|-
|'''<9> <$x9> <$y9> <$z9>'''
|-
| '''}'''
|}
----
{|
|  style="width:200px" | '''$nx ''' || number of elements in the local x directions of the block
|-
|  '''$ny ''' || number of elements in the local y directions of the block
|-
|  '''$e1 ''' || element from which the mesh generation will start
|-
|  '''$n1 ''' || node from which the mesh generation will start
|-
|  '''element ''' || string defining which quadrilateral elements is being used ([[Quad Element|quad]], [[Shell Element|ShellMITC4]], [[Bbar Plane Strain Quadrilateral Element|bbarQuad]], or [[Enhanced Strain Quadrilateral Element|enhancedQuad]])
|-
|  '''elementArgs ''' || list of data parameters for element being used
|-
|  '''{$x1, .... ,$x9}, {$y1, .... ,$y9} ''' || coordinates of the block elements in two dimensions
|-
|  '''{$z1, .... $z9} ''' || coordinate of the block elements in third dimension (optional, default=0.0)
|}
----
NOTE:


{|  
1. Only the first four nodes (1-4) are required. Nodes 5-9 are used to generate curved meshes. The user may specify any combination of nodes 5-9, omitting some of them if desired.
| style="background:yellow; color:black; width:800px"  
 
| '''block2d $nx $ny $e1 $n1 element (element arguments) {'''
2. This command recognizes variable substitutions when the command arguments are placed in quotes.
 
----
 
EXAMPLE:
 
{|
| '''block2D 16 4 1 1 quad "1 PlaneStrain2D 1" {'''
|-
| '''1  0  0'''
|-
| '''2  40  0'''
|-
| '''3  40 10'''
|-
|-
| '''1 $x1 $y1 <$z1>...'''
| '''4  0  10'''
|-
|-
| '''}'''
| '''}'''
|}
|}
----
Node numeration of a quadrilateral element:
[[Image:quadEle.PNG|link=Block2D Command]]

Latest revision as of 23:01, 12 August 2010



The block2D command generates meshes of quadrilateral elements in two or three dimensions. In three dimensions, a two-dimensional surface appropriate for shell analysis is generated.

block2d $nx $ny $e1 $n1 element elementArgs {
1 $x1 $y1 <$z1>
2 $x2 $y2 <$z2>
3 $x3 $y3 <$z3>
4 $x4 $y4 <$z4>
<5> <$x5> <$y5> <$z5>
<6> <$x6> <$y6> <$z6>
<7> <$x7> <$y7> <$z7>
<8> <$x8> <$y8> <$z8>
<9> <$x9> <$y9> <$z9>
}
$nx number of elements in the local x directions of the block
$ny number of elements in the local y directions of the block
$e1 element from which the mesh generation will start
$n1 node from which the mesh generation will start
element string defining which quadrilateral elements is being used (quad, ShellMITC4, bbarQuad, or enhancedQuad)
elementArgs list of data parameters for element being used
{$x1, .... ,$x9}, {$y1, .... ,$y9} coordinates of the block elements in two dimensions
{$z1, .... $z9} coordinate of the block elements in third dimension (optional, default=0.0)

NOTE:

1. Only the first four nodes (1-4) are required. Nodes 5-9 are used to generate curved meshes. The user may specify any combination of nodes 5-9, omitting some of them if desired.

2. This command recognizes variable substitutions when the command arguments are placed in quotes.

EXAMPLE:

block2D 16 4 1 1 quad "1 PlaneStrain2D 1" {
1 0 0
2 40 0
3 40 10
4 0 10
}

Node numeration of a quadrilateral element:

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