2D dependent meshes

Use 2D Dependent Mesh to create identical free or mapped meshes on different faces within your model. With 2D Dependent Mesh, you select a master face (the independent face) and a target face (the dependent face). When the software generates the mesh on those faces, it ensures that the mesh on the target face matches the mesh on the master face.

2D Dependent Mesh is useful in a variety of modeling situations. For example, you can create dependent meshes between selected faces to model contact problems. You can also create dependent meshes in flange meshing situations where you need to carefully match meshes along a flange.

Selecting a dependent mesh type

On the 2D Dependent Mesh dialog box, you can create two different types of dependent mesh:

• General

• Symmetric

With a General type of dependent mesh, the master and target faces must be topologically identical (have the same number of edges and curves), but they can be uniformly scaled, such as those in the example below:

General type dependent meshes are useful, for example, for ensuring that meshes match in contact regions.

With a Symmetric type of dependent mesh, the master and target faces must be identical. If you choose Symmetric as the type, you must also specify a coordinate system. The software uses this coordinate system to transform the nodes from the master face to the target face to calculate the appropriate node locations on the target face. This ensures that the target node locations are the exact transformed node locations of the master.

Symmetric type dependent meshes are intended for models that are cyclically symmetrical. In a cyclic symmetry analysis, the nodes on the symmetry plane must match up and have a one-to-one correspondence. This allows the software to generate proper constraint equations to enforce the cyclic symmetry. Defining a Symmetric type dependent mesh at that symmetry plane ensures that the nodes along that plane match exactly.

Dependent mesh boundary mapping method

With the 2D Dependent Mesh command, the software maps the nodes on the boundary of the master face to the boundary of the target face using the N to N mapping method. N to N mapping is a topological mapping method. With the N to N method, the software maps nodes on an edge-to-edge or curve-to-curve basis from the master surface to the dependent surface. Because of this boundary mapping method, both the master and target faces must have the same number of edges or curves.

Target faces cannot also serve as master faces

If a face has been designated as a target face in a dependent mesh, you cannot use that target face as a master face in a different dependent mesh definition. For example, you cannot create two dependent meshes in which F2 is the target surface of F1, and F2 is the master surface of F3.

Models with cyclic symmetry

If you use the Default Cyclic Symmetry Cylindrical CSYS option to define a default cylindrical coordinate system when you create a FEM file, the 2D Dependent Mesh command uses that information to set the Reference CSYS and Specify CSYS options in the 2D Dependent Mesh dialog box.

Additionally, the software uses the data from the cylindrical coordinate system to try to identify:

• The appropriate target face after you select the master face.

• The correspondence between the master and target edges.

• The correspondence and direction between any inner loops.

Note:

You can modify any of the selections that the software infers.

Where do I find it?

Application	Pre/Post
Prerequisite	A FEM file as the work part and displayed partA default cyclic symmetry cylindrical coordinate system specified for the FEM file
Command Finder	2D Dependent Mesh

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2D dependent meshes, Simcenter 3D 2021.1 Series

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