Engineering Solutions

Dependency panel

Dependency panel

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Dependency panel

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Use the Dependency panel to find nodes that have their degrees of freedom removed by a constraint or MPC (multiple point constraint) more than once.  By identifying and correcting such dependencies prior to solving, solution errors can be avoided.

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Panel Usage

The Dependency panel is very simple in layout, containing only an entity collector and a dependency command button.  Selecting entities via the collector and clicking the dependency button highlights the nodes that have multiple constraints or MPC's.

dependency_panel

Note:Nodes that have multiple constraints or MPCs are placed on the temporary node mark. However, nodes with multiple constraints or MPC’s can cause solution errors in many solvers. Every situation should be evaluated and corrected accordingly. In the case of rigid elements, often swapping the independent and dependent nodes of the elements, or moving the constraints to the independent nodes, will correct the problem.

 

Subpanels and Inputs

There are no subpanels on the Dependency panel. All inputs are located on the main panel.

 

Panel Inputs

Input

Action

comps/elems selector

Use this entity collector to select the entities you wish to check for dependencies.  Use the switch to change between components and elements.

When you select elems, click the switch to change the selection mode.

elems

Select individual elements, or select all of the elements contained by a component or on a surface.

faces_edges_entities

faces

Select all of the elements on 2D and 3D faces.

If there are discontinuities on a 2D face, then only the elements inbetween the discontinuities will be selected.

faces_edges_faces

2D faces ext

Select all of the elements on a 2D face that contain discontinuities.

faces_edges_2d_faces_ext

dependency

Click this to perform the check and highlight any nodes in the selected entities that have multiple constraints or MPC's

face angle / individual selection

Face angle

The face angle is the angle between the normal of facets that share an element edge. A facet can either be a shell element itself, or one of the faces of a solid element. The normal of triangular facets is that of the plane defined three corner vertices. Whereas, the normal of quadrilateral facets is calculated by taking the cross-product between its two diagonals. This special treatment for quadrilaterals is because a warped shape does not lie completely on a plane.

Only available when the entity selector is set to elems and the selection mode is set to faces or 2d faces ext.

 

Individual Selection

Select individual elements on a face or select individual free/shared edges of elements.

Only available when the entity selector is set to elems and the selection mode is set to faces.

 

See Also:

Alphabetical List of Panels