Multi-block decomposition in meshing

The software uses the multi-block decomposition technique in 2D free meshing, 2D mapped meshing, and 3D tetrahedral meshing to internally divide the geometry selected for meshing into regular rectangular regions. The software then uses those regular regions to generate a more structured mesh.

Multi-block decomposition in 2D free meshing

Use the Attempt Multi-Block Decomposition option in the 2D Mesh dialog box to improve quadrilateral meshes on largely orthogonal surfaces (surfaces with a number of near 90° corners). When you select this option, the software breaks up faces into a cluster of convex regions and then generates meshes on each convex region. In general, the resulting meshes are more orthogonal in nature. If you select both the Attempt Multi-Block Decomposition and the Attempt Free Mapped Meshing options, the software creates a structured mesh on more regions of your model.

The graphics show the difference between a surface meshed with quadrilateral elements (1) and the same set of surfaces meshed using the Attempt Multi-Block Decomposition option (2).

Additionally, when you select Attempt Multi-Block Decomposition, Attempt Free Mapped Meshing, and the CAD Curvature Abstraction options, the software uses a methodology to analyze surfaces and identify certain types of features, such as narrow bead and annular surfaces. This produces a better, more structured mesh in those regions.

With these options, the software is able to, for example, capture details, such as the crests of beads, while creating a mapped mesh along the body of the bead, as shown in the following graphic.

The software can also produce an all quadrilateral mesh along annular faces, as shown in the following graphic.

Multi-block decomposition in 2D mapped meshing

Select the Attempt Multi-Block Decomposition option in the 2D Mapped Mesh dialog box to create a structured mesh on faces comprised of a single loop (boundary):

• That are comprised of a single loop (boundary) but that have five or more sides.

• Where the software cannot successfully generate a mapped mesh.

Multi-block decomposition in 3D tetrahedral meshing

Select the Attempt Multi-block Meshing for Cylinders check box in the 3D Tetrahedral Mesh dialog box to produce more consistent and regular meshes around the circumferences of adjacent cylinders that share a common axis. When you select a set of cylindrical surfaces, the software searches for appropriate cylinders and identifies surfaces that are related to the cylindrical surfaces, such as fillets, annuli, and chamfers. The software then generates a mesh on each set or stack of cylinders as a single entity. This process produces a continuous seam throughout the different surfaces and ensures a more regular mesh.

Note:

This process only applies to cylinders with a linear axis.

To select the Attempt Multi-block Meshing for Cylinders check box, you must also select the Attempt Free Mapped Meshing check box.

Where do I find it?

Application	Pre/Post
Prerequisite	A FEM file as the displayed part and work part
Command Finder	2D Mesh 2D Mapped Mesh 3D Tetrahedral Mesh

Learn more

Setting element size

Element size for acoustic analysis

Understanding the Automatic Element Size calculation

Understanding curvature-based size variation

Understanding the Snap Tolerance value

Show Tiny Edges

Controlling the proximity of nodes to the CAD Geometry

Understanding the mesh update process

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Multi-block decomposition in meshing, Simcenter 3D 2021.1 Series

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