A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Experimental and numerical study on vortex-induced motions of a deep-draft semi-submersible
HighlightsLow friction air bearings were developed for experimental study on VIM of DDS to limit the vertical plane motions.The characteristics of vortex shedding processes and their interaction due to multiple cylindrical columns are revealed.Provide insights of the vortex flow characteristics during the three phases of VIM.Good correlation is demonstrated among the vortex shedding patterns, the fluctuation forces on the structure, and the VIM trajectory.The comprehensive experimental and numerical results will serve as benchmarks for future study and provide guidance for practical design.
AbstractAn experimental study on vortex-induced motions (VIM) of a deep-draft semi-submersible (DDS) was carried out in a towing tank, with the aim to investigate the VIM effects on the overall hydrodynamics of the structure. In order to study the fluid physics associated with VIM of the DDS, a comprehensive numerical simulation was conducted to examine the characteristics of vortex shedding processes and their interactions due to multiple cylindrical columns. The experimental measurements were obtained for horizontal plane motions including transverse, in-line and yaw motions as well as drag and lift forces on the structure. Spectral analysis was further carried out based on the recorded force time history. These data were subsequently used to validate the numerical model. Detailed numerical results on the vortex flow characteristics revealed that during the “lock-in”, the vortex shedding processes of the upstream columns enhance the vortex shedding processes of the downstream columns leading to the rapid increase of the magnitude of VIM. In addition to the experimental measurements, for the two uniform flow incidences (0° and 45°) investigated, comprehensive numerical data of the parametric study on the VIM characteristics at a wide range of current strength will also serve as quality benchmarks for future study and provide guidance for practical design.
Experimental and numerical study on vortex-induced motions of a deep-draft semi-submersible
HighlightsLow friction air bearings were developed for experimental study on VIM of DDS to limit the vertical plane motions.The characteristics of vortex shedding processes and their interaction due to multiple cylindrical columns are revealed.Provide insights of the vortex flow characteristics during the three phases of VIM.Good correlation is demonstrated among the vortex shedding patterns, the fluctuation forces on the structure, and the VIM trajectory.The comprehensive experimental and numerical results will serve as benchmarks for future study and provide guidance for practical design.
AbstractAn experimental study on vortex-induced motions (VIM) of a deep-draft semi-submersible (DDS) was carried out in a towing tank, with the aim to investigate the VIM effects on the overall hydrodynamics of the structure. In order to study the fluid physics associated with VIM of the DDS, a comprehensive numerical simulation was conducted to examine the characteristics of vortex shedding processes and their interactions due to multiple cylindrical columns. The experimental measurements were obtained for horizontal plane motions including transverse, in-line and yaw motions as well as drag and lift forces on the structure. Spectral analysis was further carried out based on the recorded force time history. These data were subsequently used to validate the numerical model. Detailed numerical results on the vortex flow characteristics revealed that during the “lock-in”, the vortex shedding processes of the upstream columns enhance the vortex shedding processes of the downstream columns leading to the rapid increase of the magnitude of VIM. In addition to the experimental measurements, for the two uniform flow incidences (0° and 45°) investigated, comprehensive numerical data of the parametric study on the VIM characteristics at a wide range of current strength will also serve as quality benchmarks for future study and provide guidance for practical design.
Experimental and numerical study on vortex-induced motions of a deep-draft semi-submersible
Liang, Yibo (author) / Tao, Longbin (author) / Xiao, Longfei (author) / Liu, Mingyue (author)
Applied Ocean Research ; 67 ; 169-187
2017-07-14
19 pages
Article (Journal)
Electronic Resource
English
| European Patent Office | 2016
| SAGE Publications | 2018
| SAGE Publications | 2020
Shipborne semi-submersible vortex suction segmentation type water body cleaning device
| European Patent Office | 2021