This paper numerically and experimentally investigates the hydrodynamic interaction between two semi-submersible type VLFS modules in the frequency domain. Model tests were conducted to investigate the relationship between interactions and wave headings. Numerical studies were performed by solving the radiation-diffraction problem and were validated against the experimental results. Motion Response Amplitude Operators (RAOs) were obtained from numerical and experimental studies. The dependency of the hydrodynamic interaction effect on wave headings is clarified. The influence of different wave periods on the motion responses of two-module VLFS and wave elevations in the gap is studied. The results indicate that the hydrodynamic interactions of the two modules are directly related to the wave headings and the periods of the incident wave. The shielding effect plays an important role in short wave, and the influence decreases with the increase of the incident wavelength. The numerical results based on the diffraction-radiation code can give a relatively good estimation to the responses in short wave while for long wave, it would over-predict the response.
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The authors would like to thank Mr. WANG Yongheng, JI Chuan-peng and ZHAO Liang for their efforts in model tests.
Foundation item: The study was financially supported by the National Natural Science Foundation of China (Grant Nos. 51709170 and 51979167), the Ministry of Industry and Information Technology of China (Mooring position technology: floating support platform engineering (II)), the Shanghai Sailing Program (Grant No. 17YF1409700), and the China Scholarship Council (Grant No. 201806230206).
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Wang, Y., Wang, X., Xu, S. et al. Numerical and Experimental Investigation of Hydrodynamic Interactions of Two VLFS Modules Deployed in Tandem. China Ocean Eng 34, 46–55 (2020). https://doi.org/10.1007/s13344-020-0005-9
- hydrodynamic interaction
- numerical analysis
- model test
- two semi-submersible type VLFS modules