meshing 3dsolids caea 2

8/13/2019 Meshing 3DSolids CAEA 2

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ANSYS Workbenches ng

August 30, 2012

2012 CAE Associates


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How Do I Get a Brick Mesh?

3D solid elements generally come in a few basic shapes:

Hexahedron (hexas, bricks)

, ,

Tetrahedron (tets) Pyramid (less common, but essential for mixing tets and bricks)

Hex Pyramid TetWedge

It takes approximately 5-6 tetrahedrons to fill 1 brick.

Fewer elements lead to faster solution times

Hexahedron meshes are enerall more uniform

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Easier control of the element distribution


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Brick meshes always take more man-time than tetrahedral meshes.

Brick meshes are usually created using one or more of the following

Slice and dice the solid geometry to create 6-faced volumes, each face having 3 or4 boundary curves.

Create a 2D mesh of quadrilaterals and sweep or extrude the 2D mesh to create 3D

r c s. yp ca opera ons nc u e:

Revolve the mesh about an axis.

Sweep the mesh along one or more curves.

Sweep a surface mesh from one face of a volume to a topologically similar face on the

opposite face of a volume.

Brick meshes can also be created with advanced meshing methods.

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. ,an all-brick mesh can be created with some effort by the user.

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DesignModeler and forming the

resulting bodies into a part, we

can et a collection of swee able

bodies.

3 elements through the thickness

of the thin walls.

The resulting mesh of higher

order elements contains 8,208

, .

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tetrahedron mesh resulting from

the unaltered geometry is shown

to the ri ht.

Again, the mesh is generated to

thickness of the thin walls and is

meshed with very little effort.

The resulting mesh of higher

order elements contains 84,168

,

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Mesh Methods

Sweep requires topologically consistent source and target faces (same number

of vertices per face with a smooth path from the source to the target).

,

it is free meshed with tetrahedral elements. Specify manual source (and target faces) when:

There exists more than one possible sweep direction

You want to sweep mesh a thin solid with a single element through the thickness

You want to inflate the mesh near the surface of the geometry

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Mesh Methods

The number of elements in the sweep direction along with the bias settings are

also set in the sweep details.

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Mesh Methods

outer surface topology and sweeps inward. It blends the disparate hex

mesh patterns internally using wedges, pyramid and tetrahedral elements.

surface area ratio.

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Mesh Methods

dominant.

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Mesh Methods

ICEM Advanced Meshing Module) that internally segments bodies into

topologically consistent pieces.

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Combining Methods

are formed into a part.

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Selective Meshing

. Named selections are created and sent to the solver (element components).

Note: The automatic method is still used for mixed order meshing of parts.

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Summary

Many different options within ANSYS Meshing for generating a brick mesh

Ease of use of ANSYS Workbench makes generating brick meshes

simpler

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meshing 3dsolids caea 2

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