Modal Reduced-Order Model
The Modal Reduced-Order Model () study step is used for exporting reduced-order model matrices.
You can add a Modal Reduced-Order Model study step for exporting the reduced order model matrices after an Eigenfrequency study step for computing the eigenfrequencies and eigenmodes of a linear or linearized model in the frequency domain. As a study, available with the Structural Mechanics Module, MEMS Module, Acoustics Module, RF Module, or Wave Optics Module, it adds an Eigenfrequency study step before the Modal Reduced-Order Model study step.
A Modal Reduced-Order Model study step uses the Modal Solver. It uses the transient equation form for the export. The matrices can be accessed through the COMSOL Multiphysics API or in table format from a System Matrix derived value.
The Include geometric nonlinearity check box and Mesh Selection are described in Common Study Step Settings. There is also detailed information in the Physics and Variables Selection and Values of Dependent Variables sections.