This paper describes the validation of the Small Boundary Displacement Model (SBDM) of fluid-structure coupling for predicting fluid-elastic lock-in response of a D-shaped cylinder in crossflow. This coupling model extends structural small displacement theory to fluid-structure interfaces, eliminating the need for temporally changing meshes when structural motion is small compared with problem dimensions. The SBDM algorithm accurately predicts the range and characteristics of lock-in behavior when compared to an independent two-dimensional numerical solution. Further validation of the SBDM simulations is provided by comparisons to fluid-only solutions at the limits of lock-in where the cylinder boundary is forced to oscillate at the same amplitudes as the corresponding coupled simulations. The SBDM predicted fluid-elastic response exceeds the 20 dB limit commonly used for experimentally identifying lock-in behavior.

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