Mode Analysis

) study and study step are used to compute the propagation constants or wave numbers as well as propagating mode shapes for a given frequency.

For example, in electromagnetics, it is used to compute the propagation constants and mode shapes at ports and waveguide cross sections. In acoustics, it is used to compute the propagation constants and mode shapes at inlets, outlets, and cross sections of guiding structures such as ducts.

When you add a Mode Analysis study, it adds a study step under the node. The Mode Analysis study is available with the Acoustics Module, RF Module, or Wave Optics Module.

Study Settings

Select a method to : , , , , , or . The available transforms and the default transform depend on the physics interfaces in the study.

Enter a value or expression for the . The default frequency depends on the physics interfaces in the study.

From the list, choose (the default), , or . See Eigenvalue for more information.

Values of Linearization Point

Use the settings in this section to specify a linearization point.

From the list, choose (the default) to use linearization point settings controlled by the physics interfaces. Choose to specify the linearization point using the list. Select:

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to use the expressions specified on the nodes under a specific physics interface as a linearization point.

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to use a solution as a linearization point.

Use the list to specify which solution to use from the available studies. Select:

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to use a linearization point that is identically equal to zero.

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Any other available solution to use it as a linearization point. It can be the current solution in the sequence, or a solution from another sequence, or a solution that was stored with the Solution Store node. You select a stored solution by changing to the name of the stored solution. Choose a solution using the list (see under Common Study Step Settings).

Study Extensions

This section contains some optional extensions of the study, such as auxiliary sweeps (see Common Study Step Settings). Adding an auxiliary parametric sweep adds an Eigenvalue Parametric attribute node to the Eigenvalue Solver.

Distribute Parametric Solver

If you are running an auxiliary sweep and want to distribute it by sending one parameter value to each compute node, select the check box. To enable this option, click the button (

) and select in the dialog box.


	The Physics and Variables Selection, Values of Dependent Variables, Mesh Selection, Adaptation and Error Estimates, and Geometric Entity Selection for Adaptation sections and the Include geometric nonlinearity check box are described in Common Study Step Settings. There is also detailed information in the Physics and Variables Selection and Values of Dependent Variables sections.

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With the Acoustics Module: Eigenmodes in a Muffler, Application Library path .

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With the Wave Optics Module: Stress-Optical Effects in a Photonic Waveguide, Application Library path .