Specifying Initial Values

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You are viewing the documentation for an older COMSOL version. The latest version is available here. Specifying Initial Values An Initial Values node is added by default to each physics interface. In some types of analyses initial values must be provided:
• As the initial condition for a time-dependent analysis.
• As an initial guess for the nonlinear stationary solver.
• As a linearization (equilibrium) point when solving a linearized stationary model or when performing an eigenvalue study.
To enter initial values, in the Model Builder, click the Initial Values node under a physics interface node. In the Settings window, enter the Initial Values for all dependent variables (fields) in the physics interface. The default initial values are usually zero. For some physics interfaces you can also enter initial values for the first time derivative of the dependent variables. These are used when solving time-dependent problems containing second time derivatives (wave-type applications). Like other default settings, these initial values apply to all domains where no other values are specified. To use different initial values in different domains, add another Initial Values node from the Physics ribbon toolbar (Windows users), Physics context menu (macOS or Linux users), or right-click to access the context menu (all users). See Dependent Variables for more information about handling and plotting initial values.

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