25.2.46. The Solver Has Found Conflicting DOF Constraints

...at one or more nodes. Refer to the Troubleshooting section in the Help System.

A variety of boundary conditions in Workbench direct the solver to apply a specific value of displacement or rotation to one or more nodes. Among these are fixed supports, simple supports, rotational supports, frictionless supports, cylindrical supports, symmetry planes and displacements. Workbench also allows you to rotate nodes using the Nodal Orientation boundary condition. Although Workbench attempts to negotiate these constraints, along with the nodal rotations applied, there may be instances in which a node is directed to take on different and incompatible values of displacement or rotation by two or more of these boundary conditions. For such situations, Workbench will report a conflict.

One example could be to apply non-zero displacements to two faces of a model that meet at an edge, especially when the displacements do not act in perpendicular directions. Nodes along the edge may find conflicting instructions as they are instructed to move different amounts along the same direction in space. If this is the case, consider modifying the non-zero displacements so they act in perpendicular directions.

Another example could be when one or more nodal orientations are added in Workbench with other boundary conditions which are applied to same section of geometry (for example by selecting the same "Scope", or one "Scope" being a part of the other). Each Nodal Orientation prescribes a Nodal Coordinate System to a subset of nodes. Only one Nodal Coordinate System can be prescribed to a given node. Whenever this condition is not met, Workbench creates an error that "The solver has found conflicting DOF constraints with Direct FE loading at one or more nodes".

Direct FE boundary conditions cannot be applied to nodes that are already scoped with geometry-based constraints which may modify Nodal Coordinate system.