Mapping of result data between meshes

You edit the Mesh Mapping Data node to map:

• Regions between intermediary meshes.

• Regions between an intermediary mesh and a model mesh, such as a structural mesh.

• Regions of a model mesh.

In most cases, the intermediary mesh, which you import with an external file, differs by element type and element size from the model mesh where you apply the imported loads. For example, a CFD mesh typically has a finer mesh than a structural mesh.

A typical application for mapping regions between intermediary meshes is a fan noise scenario, where fan blades are not represented by a model mesh. Only an intermediary mesh represents the CFD mesh.

When you want to map a region of a model mesh to another region that is typically less dense, do the following:

1. Skip the import of an external file. Instead use the Mesh Mapping command and request the export of a mesh mapping matrix to a matrix file in text format.

2. Map the source to the target region using the Model Entities option in the Mesh Mapping Data dialog box.

3. Use the Create Groups from Mapping Matrix command options to create output groups from the mapping matrix.Note: The output group may contain influencing nodes of the source mesh, influenced nodes of the target mesh, or both. When you display information about these groups, you can check the quality of the mapping. For example, checking the mapping quality may help to find regions that you still need to map.

A typical application for mapping regions between model meshes is to:

1. Map regions between:A structural mesh region that represents an engine block.A less dense mesh region with visualization elements that envelope the engine block.Note: Mapping data to an envelope mesh reduces the number of exported DOFs, which increases the computational efficiency.

2. Create source and target nodes groups from the mesh mapping matrix to check the quality of the mapping.

3. In a structural direct frequency response solution, request vibrational response on the nodes of the source nodes group.

4. Export the mapping matrix for the structural results and use the matrix file for mapping the structural results to the (less dense) target region of the model mesh.

5. Create a load recipe from the mapped results.

6. Attach the load recipe to a vibro-acoustic solution.

7. Request output pressure and waterfall results.

8. Reference the target nodes for the structural interface entities of the fluid-structure coupling.

9. Define forcing frequencies.

You can also:

• Control the accuracy of the mapping when you select a distance mapping method, and specify a maximum search distance and number of nodes to be considered within the maximum search distance.Note: Higher accuracy is more computationally expensive.

• Map the results in the matrix file to the target region of a model mesh using the Matrix mapping method in the Mesh Mapping Data dialog box when an external result file was generated from, for example, a structural solution and matrix file.

Where do I find it?

Creating mesh mapping matrix

Application	Pre/Post
Prerequisites	A Simulation file as the work and displayed partA Model and Load Pre-processing solution process
Simulation Navigator	Right-click Model and Load Pre-processing node→Add Operation→Mesh Mapping
Location in dialog box	Options group

Editing Mesh Mapping Data node

Application	Pre/Post
Prerequisite	A Simulation file as the work part and displayed partA valid Model and Load Pre-processing solution and a Mesh Mapping Data node
Simulation Navigator	Right-click the Mesh Mapping Data node and choose Edit

Mapping regions of model meshes (also known as Model Entities)

Application	Pre/Post
Prerequisites	A Simulation file as the work and displayed partA Model and Load Pre-processing solution process that contains a Mesh Mapping node
Simulation Navigator	Expand Model and Load Pre-processing and Mesh Mapping nodes→right-click Mesh Mapping Data node→Edit
Location in dialog box	Transfer From group

Creating source and target nodes groups

Application	Pre/Post
Prerequisites	A Simulation file as the work and displayed partA Model and Load Pre-processing solution processA mesh mapping matrix
Simulation Navigator	Right-click Model and Load Pre-processing node→Create Groups from Mapping Matrix
Location in dialog box	Transfer From and Transfer To groups

Using a Mesh Mapping Matrix File to map data to a target region

Application	Pre/Post
Prerequisites	A Simulation file as the work and displayed partA Model and Load Pre-processing solution process that references a binary fileA Mesh Mapping Matrix File
Simulation Navigator	Expand Model and Load Pre-processing node→right-click Mesh Mapping node→Add Mesh Mapping Data
Location in dialog box	Mesh Mapping group→Mapping Method list

Learn more

Aeroacoustic simulation using surface dipole

Acoustic sources from CFD results workflow

Load recipes

Quick links

Command reference

Pre/Post video examples

Bulk Entry Descriptions

Simcenter 3D tutorials

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Related Topics

Selection recipes

Mapping of result data between meshes, Simcenter 3D 2021.1 Series

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