Frequency Domain, Modal Reduced-Order Model
The Frequency Domain, Modal Reduced-Order Model () node is not a study in itself; rather, it adds a number of nodes to the Model Builder tree to facilitate a reduced-order model (ROM) creation. These nodes are configured to set up a ROM to perform a frequency domain analysis using mode superposition.
Two studies are added:
One study with an Eigenfrequency study step for computing the eigenfrequencies and corresponding eigenmodes.
One study with a Model Reduction study step, in which the ROM is created. It references the previous study. In the common case that you have already computed the eigenmodes, you can change the setting of the Training study in this node to point to the old eigenfrequency study, and then delete the newly generated one. The Model Reduction study step contains a Frequency Domain subnode. The purpose of that subnode is to provide the model reduction with information about equation forms, participating physics interfaces, mesh selection, and so on.
Under Global Definitions, a Reduced-Order Modeling node becomes available. It contains two subnodes:
A Global Reduced-Model Inputs node in which you define the control parameters for the ROM.
A Frequency Domain, Modal Reduced-Order Model node. This is a placeholder for the ROM to be created.