Meshing Preferences

Define meshing preferences.

From the File menu, select Preferences > HyperMesh > Meshing to define the following meshing preferences.
Element
Default Size
Specify a default edge length for elements, in the same units that the loaded model was created in (mm, inches, and so on). This determines the default values whenever meshing, such as in the Freeform tool.
Node Cleanup Tolerance
Automatic or Manual
For Manual, specify the tolerance used to maintain the finite element data in the model. Any two nodes are coincident if the distance between them is less than the value.
Face Selection
Mesh feature angle
Specify the maximum distance that the selected entity must be within to be included in the selection. When entities are selected by face, attached adjacent elements are progressively selected if the feature angle between them is less than or equal to the mesh feature angle. This also affects automatic mesh cleanup.
Advanced
Beamsection default thickness
Change the default thickness for the beamsection shell part.
Element order
Use first-order (corner nodes only) or second-order (corner and mid-edge nodes) elements when meshing.
Element organization
Select the component to place new elements in.
CAD topology revision
Select the method for handling your model when the geometry's topology changes.
Delete mesh
Deletes the mesh from the affected surfaces.
Figure 1.


Disassociate mesh
Disassociates the mesh from the affected surfaces.
Figure 2.


Remesh
Automatically remeshes the affected surfaces.
Figure 3.


Keep mesh along matched topology
Skips the remesh when the geometry topology is matched with the finite element edge.
Remesh does not occur if the geometry topology is changed along the finite element edge.
Figure 4. Before suppression


Figure 5. Suppressed


Figure 6. After suppression, no remesh


Transformation
Select a method to control the 2D remesh and connectivity with the surrounding mesh on a CAD surface transformation.
Transformation off
On a surface transformation, the mesh is remeshed and moves along the surface by breaking the connectivity with the surrounding mesh.
Figure 7. Before surface transformation


Figure 8. After surface transformation


Keep and break
On a surface transformation, the mesh is kept in the original position without remeshing by breaking the connectivity with the surrounding mesh.
Figure 9. Before surface transformation


Figure 10. After surface transformation


Move and break
On the surface transformation, the mesh moves along the surface without remeshing by breaking the connectivity with the surrounding mesh.
Figure 11. Before surface transformation


Figure 12. After surface transformation


Remesh tetra mesh
Updates the tetra elements associated with the solid geometry locally when the geometry is modified with operations like Boolean, solid trim, or surface offset. If the boundary layer or hex elements are present, those are replaced with tets upon update.
There are two required conditions.
  1. Associate all tetra elements to solid geometry.
  2. An associated surface mesh must be present. If the surface mesh is nonexistent, generate boundary elements using the Face tool.
FE topology revision
Keep mesh
Keeps the existing mesh on the finite element topology revision.
Figure 13.


Remesh
Remeshes the surrounding mesh on the finite element topology revision.
Figure 14.


Rebuild
Rebuilds the surrounding mesh on the finite element topology revision.
Figure 15.


Note: Use Number of layers to define the zone to remesh or rebuild on the topology revision.
Allow duplicate IDs
Allows properties in different groups to have the same ID. Duplicate properties cannot exist in the same group.
Create FE Geometry when duplicating elements
Create FE Geometry when duplicating elements associated to geometry.
Mixed property warning
Displays a warning when components contain both direct and indirectly assigned properties.
Retain loads and BCs
Retains loads and boundary conditions that are applied to nodes when remeshing.
Retain element values
Retains element properties, offsets, nodal thicknesses, orientation, and 1D element values while remeshing.
Automatically update sets to mesh changes
When remeshing changes the model, automatically attempt to update sets accordingly.
Allow 2D-3D set segment re-parenting
Set segments applied to coincident 2D or 3D elements are re-parented to underlying elements if one is deleted.

Examples

When elements are moved away from surfaces:
Case 1
Topology changes within a surface and brings the nodes within the surface to the origin. Nodes associated to the edges remain in the current position.
Split within the surface:
Figure 16.


Figure 17.


Case 2
Topology changes on the surface and the edges and brings the nodes associated to the surface and edges to the origin.
Split the surface between two edges:
Figure 18.


Figure 19.


Case 3
Topology changes on the surface between two points and brings the nodes associated to the surface to the origin. Nodes associated to edges remain in the current position.
Split the surface between two points:
Figure 20.


Figure 21.