Engineering Solutions

Split panel

Split panel

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Split panel

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Use the Split panel to split plates or solid elements.  In addition, hexa elements can also be split using a technique that moves progressively through a row of elements in the model.    

Note:When you split or refine shell elements, any 1-D elements such as bars that share connectivity with the shell elements will also be split in order to avoid discontinuities in the model.

 

Subpanels and Inputs


The Split panel contains the following subpanels and command buttons:

hmtoggle_arrow1Plate Elements

Examples

HM_Panels_bmp00325

Elements are selected

HM_Panels_bmp00324

Plate elements are split

 

Panel Inputs

Input

Action

elems selector

Select elements to split.

use inferred surface if no geometry exists

When elements are split using this function, the new nodes that are created are placed on the element’s underlying geometric surface, if it exists. If there is not a geometric surface, the new nodes are placed midway between the original corner nodes unless the use inferred surface if no geometry exists checkbox is activated, in which case the new nodes are placed upon the inferred surface of the elements.

Reverse split direction

Reverses the direction quad elements are split.

Only available for when divide quads is selected.

split method options

Select a split method.

Split all sides splits a element at the midpoint of its sides.

split_all_sides

Divide quads divides quad elements into trias based on the advanced split option selected.
-Shortest diagonals splits quad element into tria elements using the shortest possible diagonal.

shortest_diag

-Aligned diagonals aligns the diagonals of all the tria elements in the same direction.

aligned_diag

-Unionjack diagonals splits quad elements into tria elements so that their diagonals create a unionjack pattern.

unionjack_diag,

-Largest angle diagonals splits quad elements into tria elements using the largest angle diagonal.

align_largest_angle_diagonals

Midpoint - to quads partitions an element by creating a node at its centroid and then forming quads using the midpoints of each of its sides.

split_all_sides

Midpoint - to trais partitions an element by creating a node at its centroid and then forming trias using the element's nodes.

midpint_to_trias

When you split elements whose nodes are associated to a surface, the new nodes created are also on the surface. To associate a node to a surface, use the Node Edit panel.

All split operators work on both first and second order elements.

split all connected 1D

Splits a connected 1D element at the midpoint of its sides. This option is only available when the split method split all sides is selected.

 

hmtoggle_arrow1Solid Elements

Examples

HM_Panels_bmp00323

Elements are selected

HM_Panels_bmp00326

Elements are split into hexas.

Panel Inputs

Input

Action

elems selector

Select the elements you want to split.

split method options

The three available patterns include:

Splitting the solid elements into hexas
Splitting the solid elements into a minimal number of tetras
Splitting the solids into symmetric sets of tetras suitable for CFD

When you split elements whose nodes are associated to a surface, the new nodes created are also on the surface.  To associate a node to a surface, use the Node Edit panel.

All split operators work on both first and second order elements.

 

hmtoggle_arrow1Hexa Elements

Examples

HM_Panels_bmp00327

Elements are selected

HM_Panels_bmp00328

Select opposing corner nodes on the face of the hexa element to indicate how to split the element.

HM_Panels_bmp00329

The hexa elements that will be affected by the split command are highlighted.

HM_Panels_bmp00330

The elements are split.

 

Panel Inputs

Input

Action

hexa element

Select the representative hexa element you want to split.

N1 / N2

Select the nodes.

split method option

Select how you want the element to be split (two pentas, penta and hexa, hexa and penta, two hexas, three hexas, or four hexas).

 

hmtoggle_arrow1Refine Elements

Engineering Solutions automatically maintains legal connectivity to shell elements that are adjacent to those that are split.

If the refined elements are attached to a surface, Engineering Solutions makes sure that the new elements are also attached to the same surface.  If they are not, Engineering Solutions infers a surface from the mesh, and positions the new nodes so that they fall on the implicit surface.

Engineering Solutions calculates chordal deviation using the algorithm described in the Check Elements panel.

 

Examples

refine

Elements are selected

refine2

Elements are split using target element size

refine3

Elements are split using chordal deviation

 

 

Panel Inputs

Input

Action

elems selector

Select the elements you want to split.

refinement option

Options include target element size and chordal deviation

split all connected 1D

 

target element edge length

The target element size.

max chordal deviation

The target chordal deviation.

min element edge length

A minimum edge length designating how far HyperMesh is allowed to go while attempting to satisfy the request accuracy.

 

hmtoggle_arrow1Command Buttons

The following action buttons appear throughout the subpanels:

Input

Action

return

Exits the panel.