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Ansys Learning Forum › Forums › Discuss Simulation › General Mechanical › Why dont I get zero frequency modes in a Modal analysis for the DOFs that are not constrained? › Reply To: Why dont I get zero frequency modes in a Modal analysis for the DOFs that are not constrained?

September 24, 2020 at 4:30 pm
dlooman
Ansys Employee
This issue only affects the rigid body rotational modes. The penalty based contact across an open gap acts like a rotational constraint.