Connect a 2D axisymmetric shaft to a 3D cyclic symmetry sector of a disk using Fourier Multi Harmonic and 3D Coupling

This procedure shows you how to connect a 2D axisymmetric shaft to a 3D cyclic symmetry sector of a disk using the Fourier Multi Harmonic and 3D Coupling simulation object. You can use these same steps to connect similar 2D axisymmetric and 3D cyclic symmetry sectors of your model, or to connect a 2D axisymmetric structure to a full 3D structure.

(1) 3D sector of a disk; (2) 2D axisymmetric shaft; (3) 1D CBEAR2 bearings

Note:

This procedure instructs you to select the necessary elements from the graphics window. For more complex models, you may want to create groups of the elements first.

1. Choose Rotor Dynamics tab→Loads and Conditions group→Simulation Object Type list→Fourier Multi Harmonic and 3D Coupling .

2. In the Fourier Multi Harmonic and 3D Coupling dialog box, type a unique name and description, and select the destination in the Simulation Navigator.

3. In the Source Region group, click Create Region to define the edge of the 2D axisymmetric shaft that connects to the 3D sector.

4. When the Region dialog box opens, in the graphics window, select the element edges (1) that abut the edge of the 3D sector.Note: The 2D and 3D meshes do not need to be touching.

5. Click OK to close the Region dialog box.

6. In the Fourier Multi Harmonic and 3D Coupling dialog box, in the Target Region group, click Create Region to define the surface elements of the 3D sector.

7. When the Region dialog box opens, in the graphics window, select the element faces (1) of the 3D sector that attach to the 2D axisymmetric shaft.

8. Click OK to close the Region dialog box.

9. In the Fourier Multi Harmonic and 3D Coupling dialog box, in the Connection Nodes group, from the Virtual Nodes Generated list, select By Number, and in the Virtual Nodes Number box, type the number of virtual nodes you want to generate.In this example, 45 is a good number because the region of the 3D sector that attaches to the 2D shaft consists of 90 elements. Entering 90 would result in too many virtual nodes and an over-constrained model. The alternative to setting the number of virtual nodes is to select By Distance Between Nodes. When you do this, you set an optimum distance between the virtual nodes, and the software generates an appropriate number of nodes.

10. Clear the Automatic Angles Computation check box and type values for Initial Angle (ANGLEI) and Variation Angle (ANGLED).In this example, a good value for Initial Angle (ANGLEI) is -45°, and a good value for Variation Angle (ANGLED) is 88°. The value for Variation Angle (ANGLED) should be approximately 67% to 75% of the sector angle, which ensures that the border edge of the 3D sector is not included.The alternative is to select the Automatic Angles Computation check box and let the software compute the angles for you. When you do this, you can retrieve the computed angle values from the .f06 file.

11. Click OK.

Connect a 2D axisymmetric shaft to a 3D cyclic symmetry sector of a disk using Fourier Multi Harmonic and 3D Coupling, Simcenter 3D 2021.1 Series

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