Time Dependent, Modal Reduced-Order Model
The Time Dependent, Modal Reduced-Order Model () node is not a study in itself; rather, it adds a number of study 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 time dependent analysis using mode superposition.
Two studies are added:
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One study with an Eigenfrequency study step for computing the eigenfrequencies and corresponding eigenmodes.
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One study with a Time Dependent study step. This study can mainly be considered as a placeholder which is a mandatory input to the model reduction.
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One study with a Model Reduction study step, in which the ROM is created. It references the two previous studies. 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 Time Dependent 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 is added. It contains two subnodes:
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A Global Reduced-Model Inputs node in which you define the control parameters for the ROM.
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A Time Dependent, Modal Reduced-Order Model node. This is a placeholder for the ROM to be created.