checkbox in the Solve for column. If a physics interface cannot set up an equation matching the study step type, the checkbox will be automatically cleared and disabled unless an equation form has been explicitly selected for the interface. checkbox in the Solve for column. If a physics interface cannot set up an equation matching the study step type, the checkbox will be automatically cleared and disabled unless an equation form has been explicitly selected for the interface.
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Clearing the Solve for setting for a physics interface in a study does not mean that the physics interface is disregarded. The solver then does not include the DOFs in its assembled system, but all variables and shape functions in the physics interface are generated. If the values of variables not solved for are taken from the solution of another study step (see Values of Dependent Variables), then variables are generated for the equation form of that study step. Otherwise, they are generated for the physics interface’s default equation form.
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checkbox in the Solve for column (by default, a study step solves for all coupling features that recognize the study type). If you clear the Solve for checkbox, any equations and dependent variables that the multiphysics coupling adds are not included, but the multiphysics coupling still affects the definition of variables.
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Clearing the Solve for setting will for some multiphysics couplings remove the coupling effect from the model, for others it will not. This depends on whether the coupling is implemented as a separate equation added to the system — in which case it will be removed — or as a contribution to variables declared by the coupled physics interfaces — in which case it will be unaffected.
To ensure that the effect of a multiphysics coupling is completely disregarded, select the Modify model configuration for study step checkbox and disable it in the study step, or disable it manually in the Model Builder.
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Choose to solve for or not solve for dependent variables associated with a component or physics interface node in the same way as when the Modify model configuration for study step checkbox is not selected.
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Disable control over a frame implemented by a node, available for Moving Mesh, Deformed Geometry, Shape Optimization, and some physics interfaces.
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) to move to the corresponding original node in the model tree. Click the Collapse All (
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) buttons if desired to completely collapse or expand the physics tree. Depending on the selected nodes, additional actions appear in the toolbar and context menu.
Disable (or right-click to select it from the context menu) to disable enabled nodes that are possible to disable. The contributions, conditions, or variables in a node that you disable are not included in the study when solving. A disabled node is unavailable in the tree. You can also right-click any applicable node in the model tree to select 
Disable in all studies. That node is then disabled for all studies.
Enable (or right-click to select it from the context menu) to enable disabled nodes. The contributions, conditions, or variables in a node that you enable are included in the study when solving.|
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Cannot be Disabled — for default nodes in the physics interfaces.
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Disabled in Model Builder — for nodes that you have disabled in the Model Builder.
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From the Discretization list, choose a discretization for the physics in the physics interface. The default (and often the only) choice is Physics settings, which means that the study uses the discretization from the main physics interface node’s settings. Changing it affects the discretization order used by this study. To add another discretization, use a separate Discretization node in the physics interface.
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From the Equation form list, choose an applicable equation form for the study step and physics interface: Automatic (the default, appearing with the default equation form in parentheses such as Automatic (Stationary)) or any other applicable equation form. If you change the equation form, the information is updated in the table of physics interface when you clear the Modify model configuration for study step checkbox. In addition to physics interfaces, the Equation form list is available for reduced-order models with a stateful interface.
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 Solve For (the default setting) to fully enable the node and solve for dependent variables defined by the node and its active children. This is similar to the  checkboxes in the Solve for columns when not using Modify model configuration for study step. A physics interface in this state shows a small green dot in its lower-right corner to indicate that the study step solves for the degrees of freedom (dependent variables) in the physics interface and features. This is an example of a Laminar Flow interface with the green dot:  . |
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 Disable in Solvers to not solve for the physics interface but provide degrees of freedom (dependent variables) and other physics node variables using the settings for values of variables not solved for (see Values of Dependent Variables). This state is similar to when a corresponding Solve for column checkbox is cleared when not using Modify model configuration for study step. A physics node in this state shows a small orange dot in its lower-right corner to indicate that the node and its active children provide degrees of freedom but these are not solved for in the study step. For example, a Laminar Flow interface with an icon that looks like this  is both showing that it provides degrees of freedom not solved for (orange dot in the lower-right corner) and has a change of state indicated by the asterisk. |
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 Disable in Model to fully disable a node and its children in the model. The node and its children do not contribute to the study, and no variables, including the degrees of freedom (dependent variables), are included. A disabled node and its children are grayed out, and the parent node shows a small red dot in its lower-right corner to indicate that the study step provides no degrees of freedom for it. For example, a Transport of Diluted Species interface with an icon  is disabled (grayed out), provides no degrees of freedom (red dot in the lower-right corner), and has a change of state indicated by the asterisk. |
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If the node is disabled in the Model Builder, it is grayed out. If you right-click it, the context menu contains Disabled in Model Builder. In this case, none of the options above are available.
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If the node defines degrees of freedom but not equations applicable for the current study step type, then the Solve For option
 is grayed out and unavailable. Disable in Solvers is then the default option and therefore does not display any asterisk as indication of a changed state. |
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) in the toolbar or by right-clicking the node and selecting Control Frame Deformation from the context menu.
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If you have the AC/DC Module, see Electric Shielding: Application Library path ACDC_Module/Introductory_Electric_Currents/electric_shielding.
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means that the corresponding entity is active and solved for.
means that the corresponding entity is active but not solved for, either because of the user settings or because it is not applicable for this study step. In this case, the variables are still generated.
means that the corresponding entity’s state has been changed in some study step (see 
means that the corresponding entity’s equation form has been changed in this study step.
means that the corresponding entity’s equation form is locked (that is, that the equation form has been set in the corresponding node in the Model Builder tree and cannot be changed in a study step).