H.M. Pot
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This study investigates the influence of stiffness on the hydroelastic wave-structure interactions of floating sheets, a concept for offshore photovoltaics. We propose an experimental method in which we can vary models, amplitudes and frequencies effortless, since conventional experimental methods have limitations, especially for large out-of-plane deformations. Moreover, green water effects which often occur for steep waves are eliminated with this setup. This study investigates the applicability of linear hydroelastic theory with the measurements on two floating membranes with different thickness. The measured hydroelastic wavelengths are for both membranes larger than the predictions by the theoretical hydroelastic dispersion. We find that the measurements of both thicknesses can be matched if an in-plane tension is added to the linear hydroelastic dispersion relation. This study demonstrates that the measurements are not well predicted by the linear theory and the stresses in the structure are most likely underestimated by this prediction.
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This study investigates the influence of stiffness on the hydroelastic wave-structure interactions of floating sheets, a concept for offshore photovoltaics. We propose an experimental method in which we can vary models, amplitudes and frequencies effortless, since conventional experimental methods have limitations, especially for large out-of-plane deformations. Moreover, green water effects which often occur for steep waves are eliminated with this setup. This study investigates the applicability of linear hydroelastic theory with the measurements on two floating membranes with different thickness. The measured hydroelastic wavelengths are for both membranes larger than the predictions by the theoretical hydroelastic dispersion. We find that the measurements of both thicknesses can be matched if an in-plane tension is added to the linear hydroelastic dispersion relation. This study demonstrates that the measurements are not well predicted by the linear theory and the stresses in the structure are most likely underestimated by this prediction.
Wave-structure interactions of flexible membrane-type materials are an emerging research field, driven by their potential in renewable energy and breakwater concepts. This study proposes stereoscopic digital image correlation (DIC) as a scalable method for spatiotemporal measurements of fluid-structure interactions in wave tanks. The scalability is presented by two setups with domain dimensions ranging from O(10−1 m) to O(101 m). The calibrations of 5 adjacent and synchronized stereoscopic camera pairs are projected on a common frame of reference to cover the large domain. The presented methodology includes suggestions on the calibration method, and a practical speckle application technique is proposed. The benefits of the method are highlighted by the preliminary indication of a dynamic scaling law for wave-structure interactions. This work can serve as a foundation for further development and application of stereoscopic DIC for such structures. It is expected that this large domain method will contribute to further physical understanding of the fluid-structure interactions of large floating structures in waves.
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Wave-structure interactions of flexible membrane-type materials are an emerging research field, driven by their potential in renewable energy and breakwater concepts. This study proposes stereoscopic digital image correlation (DIC) as a scalable method for spatiotemporal measurements of fluid-structure interactions in wave tanks. The scalability is presented by two setups with domain dimensions ranging from O(10−1 m) to O(101 m). The calibrations of 5 adjacent and synchronized stereoscopic camera pairs are projected on a common frame of reference to cover the large domain. The presented methodology includes suggestions on the calibration method, and a practical speckle application technique is proposed. The benefits of the method are highlighted by the preliminary indication of a dynamic scaling law for wave-structure interactions. This work can serve as a foundation for further development and application of stereoscopic DIC for such structures. It is expected that this large domain method will contribute to further physical understanding of the fluid-structure interactions of large floating structures in waves.