The Dependent Variables node automatically updates the Field nodes. So, if the study type for the solver changes or if you use a different study type, then the Field nodes change accordingly. Also see Scaling of Variables and Equations for information.
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Initial expression (the default) to use the expressions specified on the Initial Values nodes for the physics interfaces in the model.
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Solution to use initial values as specified by a solution object. Use the Solution list to specify what solution object to use (directly or as part of the initial expression). Select:
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Zero to initialize all variables to zero.
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For a Stationary study, from the Selection list, select Automatic (the default) to use the last (typically the only) solution, select First to use the first (typically the only) solution, select Last to use the last (typically the only) solution, select All to use all (typically just one) solutions from that study, select Manual to use a specific solution number that you specify, or select 1 to use the first (typically the only) solution. If you use a parametric continuation of the stationary study, there can be additional solutions to choose from.
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For a Time Dependent study, from the Time list, select Automatic (the default) to use the solution for the last time, select First to use the first solution, select Last to use the last solution, select All to use all solutions from that study, select Interpolated to specify a time in the text field that opens and use the interpolated solution at that time, select Manual to use a specific solution number that you specify, or select one of the output times to use the solution at that time.
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For an Eigenvalue study, from the Selection list, select Automatic (the default) to use the first eigenvalue and its associated eigensolution, select First to use the first solution, select Last to use the last solution, select All to use all solutions from that study, select Manual to use a specific solution number that you specify, or select one of the eigenvalues to use the corresponding eigensolution.
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For a Parametric Sweep or Frequency Domain study, from the Parameter value list, select Automatic (the default) to use the first parameter value set or frequency, select First to use the first solution, select Last to use the last solution, select All to use all solutions from that study, select Manual to use a specific solution number that you specify, or select one of the parameter value sets or frequencies to use the corresponding solution.
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Automatic to get an automatically determined scaling (the default), which works well for most models. It is initially based on the magnitudes of the elements in the Jacobian and mass matrices. For nonlinear problems these scales are recomputed based on the magnitude of the solution iterate.
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Initial value based to get a scaling that is determined from the initial values. Use this if the components of the initial values give a good estimate of the order of magnitude of the solution.
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Manual to manually enter a scaling if you know the order of magnitudes of the variables in advance. For instance, suppose that a model solves for a dependent variable u, and that the values of u are on the order of 10−4. To use this knowledge, type 1e-4 in the Scale field. The solvers then internally use a solution vector rescaled to the order of 1 for u. If there is more than one dependent variable that the model solves, they are all rescaled with the same factor.
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None to skip scaling.
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Initial expression to use the expressions specified on the Initial Values nodes for the physics interfaces in the model.
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Solution to use initial values as specified by a solution object. Then use the Solution list to specify what solution object to use if Method has been set to Solution. Select:
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Zero to initialize all variables to zero.
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See Solution List Options by Study Type for additional choices based on study type and then available in this section.
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