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From 9.8.3. Fender Friction and Damping (ansys.com), equation (9.89), you may need to define a very small stiffness, for example k=1.0e-3 N/m, the input fender damping coefficient is 5 N.s/m / k = 5 N.s/m /1.0e-3 N/m = 5e3 s.