Block2D Command

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 "element arguments" {

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
$n1	node from which the mesh generation will start
element	string defining which quadrilateral elements is being used (quad, ShellMITC4, bbarQuad, or enhancedQuad)
(element arguments)	list of data parameters of element being used
{$x1, .... ,$x9}, {$y1, .... ,$y9}	coordinates of the block elements in two dimensions (global coordinate system)
{$z1, .... $z9}	coordinate of the block elements in third dimension (optional, default=0.0)

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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.

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EXAMPLE:

block2D 16 4 1 1 quad "1 PlaneStrain2D 1" {

1 0 0

2 40 0

3 40 10

4 0 10

}

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Node numeration of a quadrilateral element: