) solver to perform either parameter stepping (also called frequency response) or time stepping (also called transient response) using a reduced model. The model reduction uses precomputed eigenvalues and eigenvectors. This solver is automatically used when a Time Dependent, Modal or Frequency Domain, Modal study is added to the model.|
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Frequency domain to perform parameter stepping using a reduced model. Then continue defining the settings For Frequency Domain, Modal Studies.
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Time dependent to perform time stepping using a reduced model. Then continue defining the settings For Time Dependent, Modal Studies.
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) to define a range of parameter values using the Range dialog box.
) to specify such a text file. You can also click the downward arrow beside the Browse button and choose Browse From (
) to open the fullscreen Select File window. Click the downward arrow for the Location menu (
) to choose Show in Auxiliary Data (
) to move to the row for this file in the Auxiliary Data window, Copy Location (
), and (if you have copied a file location) Paste Location (
). Click the Read File button (
) to read the specified file. The read values appear in the Parameters values field.
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Frequency (the default setting) to use the parameter values without modification.
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Fraction to multiply the parameter values by the absolute value of the largest eigenvalue in the reduced model divided by two.
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Spread to treat the parameter values as an interval around each eigenvalue in the reduced model. That is, the absolute value of each eigenvalue is multiplied by the parameter values and the resulting parameter value vectors are concatenated into one.
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Linear to use a linear solver with the same linearization point for both residual and Jacobian computation, which corresponds to one step in Newton’s method.
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Linear perturbation (the default setting) to use a linear solver that computes the Jacobian in the same way as the Linear option but uses a zero solution when computing the residual. It is useful for small-signal analysis and similar applications where the variations around a linearization point are of interest.
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) to define time values. Output from a simulation includes the times given in this field and the corresponding solutions.|
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When a Frequency Domain, Modal study is selected, the Relative tolerance is used as a termination tolerance for iterative linear system solvers and for error checking (if enabled) for direct linear system solvers.
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When a Time Dependent, Modal study is selected, the Relative tolerance is used by the solver in each time step to control the relative error. The absolute tolerance settings below work in the same way as for the time-dependent solver, but internally the full length absolute tolerance vector is transferred to the modes by the same transformation (projection) as is used to transform the problem to reduced form (the eigenmodes).
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The Use list is available for solution sequences with additional stored solutions. When available, select an option to specify a solution containing the modes to be used in the reduced model.
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Initial expression to use the expressions specified on the Initial Values nodes under a specific physics interface as a linearization point.
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Solution to use a solution as a linearization point. Then, when Solution is selected from the Prescribed by list, specify which solution to use. Select:
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Zero to use a linearization point that is identically equal to zero.
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When you want to define auxiliary parameters that are part of the equations like CFLCMP or niterCMP and where the solver does not define these parameters.
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) to add a constant and then define its name in the Constant name column and its value (a numerical value or parameter expression) in the Constant value column. By default, any defined parameters are first added as the constant names, but you can change the names to define other constants. Click Delete (
) to remove the selected constant from the list.