A Validation Method for Fluid-Structure Interaction Simulations Based on Submerged Free Decay Experiments

Before using any simulation method for load simulations, it must be verified and validated. However, it is not enough only to find a discrepancy between the model and the reference data, but it is also required to identify the section within the code responsible for any bugs. Therefore, the aim of this paper is to present a set of basic validation cases to be used in fluid‐structure interaction (FSI) simulations. By splitting the FSI method into its key functionalities of forces, torques, translations, rotations, etc., each part of the coupling can be validated by itself with a specific case. Each of the cases consists of a free decay pendulum in water. To gain experimental reference data, the cases are set up in a water basin and the motion over time is recorded with an optical measurement system. In a second step, the validation cases are set up in a fluid‐multibody FSI code and simulated. The motions from numerical simulation and experiment are compared and used to draw a conclusion on the integrity of the experimental data presented and the validity of the tested FSI code.

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