3D hybrid from shell meshing

Use the 3D Hybrid from Shell Mesh command to fill a domain with hybrid tetrahedral-hexahedral elements using a closed 2D shell mesh as a seed for the domain boundary. This command is the equivalent of the Solid from Shell Mesh command with the solid mesh composed of a mix of tetrahedral, hexahedral, and pyramid elements.

You can use this command to create hybrid tetrahedral-hexahedral solid meshes:

• From imported shell meshes that do not have a CAD or polygon body associated with them, for example in acoustic and vibro-acoustic analyses.

• From shell meshes generated by the surface wrapper in the Assembly FEM environment.

Simulation Navigator meshing nodes

When you use this command, the software creates three solid meshes if the resolution is fine enough. If the resolution is not fine enough, only tetrahedral elements are created.

3D Collectors
Solid(1)
3d_tets_from_shells(1)
3d_pyras_from_shells(1)
3d_hexas_from_shells(1)

• The 3d_tets_from shell node contains the tetrahedral volume mesh which is used to fill the areas between the hexahedral elements and the 2D shell elements.

• The 3d_pyras_from shell node contains the transitional mesh used for transition from the hexahedral elements to the tetrahedral elements. It is composed of pyramid elements.

• The 3d_hexas_from shell node contains the hexahedral volume mesh of the specified element type and size, and oriented in the specified direction.

2D mesh must form a closed volume

The 2D meshes that you select with the 3D Hybrid from Shell Mesh command must form a completely enclosed volume. If they do not, the software cannot generate the 3D meshes.

Tip:

Use the Element Edges command to find unconnected elements within the 2D mesh. This lets you see whether there are any gaps from missing or unconnected elements in the boundary of the volume. See Checking for free and non-manifold element edges for more information.

Additionally, the source 2D meshes should not contain any coincident elements.

Tip:

Use the Check Nodes command to identify duplicate nodes. Identifying duplicate nodes can help you locate coincident elements. For more information, see Checking for duplicate elements and nodes.

Separate 3D meshes in interior volumes

You can create multiple 3D meshes for the nested enclosed 2D shells using theMesh Interior Volumes check box in the 3D Hybrid Mesh From Shell dialog box. If you select this option, the software generates one 3D mesh for the outer skin of each 2D mesh that defines the boundary of an enclosed volume and a separate 3D mesh for its corresponding interior volume. This option is useful for modeling thermal or flow problems, in which the interior volumes represent a heat sink or source, or a flow obstacle.

Solid mesh associativity

The 3D meshes that the 3D Hybrid from Shell Mesh command creates are not associated with either the source 2D mesh or with any geometry. If any of the selected 2D meshes update, the software automatically deletes the 3D meshes generated by the 3D Hybrid from Shell Mesh command. You can then use the 3D Hybrid from Shell Mesh command to recreate the 3D meshes from the updated 2D meshes.

Where do I find it?

Application	Pre/Post
Prerequisite	2D meshes forming a closed volume
Command Finder	3D Hybrid from Shell Mesh
Simulation Navigator	Right-click the FEM node→New Mesh→3D→Hybrid from Shell

How do I

Create a 3D hybrid mesh

Create a 3D hybrid mesh from shell

Mesh multiple domains from closed 2D shell meshes

Learn more

3D hybrid meshing

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3D hybrid from shell meshing, Simcenter 3D 2021.1 Series

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