트렌치내에서 복합 해저관로 안정성의 수치해석과 실험해석 비교

초록

There are avantages in the installation of dual subsea pipelines over tow separate single lines. In many case it can reduce the cost for trench, bak-filling and installation. However, the installation of dual pipelines often requires technical challenges. Dual pipelines should be place to be stable to external loadings not only during the installation but also in the desing life. Dual pipelines in trench can reduce the influence of external forces. To investigate applied forces as slope changes, number of experiments are conducted with PIV in a circulating water channel. Numerical approaches are also made to compare with experimental results. The velocity fields around dual pipelines in trench are investigated and analysed. Compareison of both results show similar patterns of flow around dual pipelines. It is proved that the trench slope affects the pipeline stability significantly. The results can be applied in the stability design of dual pipelines in trench section. The complex flow patterns can be referenced effectively linked in the understanding of fluid around bodies in trench