General

General

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  2. Structures - General
  3. In ANSYS Mechanical when forces or displacements are applied on nodes using Direct FE that conflict with a displacement, Frictionless Support, etc. the Solve immediately issues an error message as below and stops solving. “The solver has found conflicting DOF constraints with define Direct FE loading at one or more nodes” , and the error is resolved when Direct FE loading is replaced with Geometric loading. Why is this message being issued when there is no conflict (boundary conditions are not adjacent)?

In ANSYS Mechanical when forces or displacements are applied on nodes using Direct FE that conflict with a displacement, Frictionless Support, etc. the Solve immediately issues an error message as below and stops solving. “The solver has found conflicting DOF constraints with define Direct FE loading at one or more nodes” , and the error is resolved when Direct FE loading is replaced with Geometric loading. Why is this message being issued when there is no conflict (boundary conditions are not adjacent)?

Tagged: 17.2, General, mechanical, Structural Mechanics/ general, structural-mechanics
    • June 5, 2023 at 7:04 am
      FAQFAQ
      Participant

      In Mechanical the frictionless support may require nodal rotations which are done more or less automatically. Nodal rotations would invalidate the force loading. In APDL the user is in control of and aware of nodal rotations so he can do whatever he wants. In your test the nodal forces did not conflict with the adjacent constraints for the frictionless support, but the error trap is not precise enough to detect that.

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