Replace different FEM files with an Acoustics BEM ATV set

You can replace a FEM, component, or assembly FEM file that contains an acoustic domain mesh with an Acoustics BEM acoustic transfer vector (ATV) set.

You can select an existing set from the ATV Sets node in the Simulation Navigator, or you can create a new set by selecting a data source from a solution result or from an external *.ssndb file.

1. In the Simulation Navigator, right-click a FEM, component FEM, or assembly FEM and choose Edit Representation.To select a component FEM, make the assembly FEM file the work or displayed part and set the solver environment of the assembly FEM file to Simcenter 3D Noise and Vibration.

2. From the Representation list, select the ATV Set type that you want to replace the FEM with.

3. Do one of the following depending on whether you want to use an existing set or create a new one:To use an existing ATV set, select it from the list and continue with the next step.To create a set from a solution result in the Simulation Navigator, click Create FEM Data Set and do the following:Note: You must have an existing *.ssndb file.In the Name box, type a unique name for the set. Click Solution Result.Select a solution from the list.Only solutions with existing results files appear in the list. Click OK.To create a set from an external .ssndb file, click Create FEM Data Set and do the following.In the Name box, type a unique name for the set. Enter an existing file path and name or Browse to navigate to the file that contains the results.You use a Simcenter 3D Acoustics BEM Database File result file (.ssndb) from an Acoustic Transfer Vector solution.Click OK.

4. In the Graphical Representation group, choose how to display the set.None — Does not display the original acoustic mesh.Approximation of base FEM — Displays a mesh that approximates the original acoustic mesh. If the original mesh is empty, nothing will be displayed.Superelement Symbol — Displays the ATV as a spider element that connects all the nodes to the center of the component.If the model contains a microphone mesh that envelopes the entire fluid domain, you may need to suppress the display of part of the microphone mesh using Hide or Clip Section to display the ATV.

5. If you changed the ATV set, select the Regenerate the FEM approximation check box to incorporate the new topology.

6. In the FE Model Component Representation dialog box, click OK.

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Replace different FEM files with an Acoustics BEM ATV set, Simcenter 3D 2021.1 Series

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