Fluid – structure interaction study for the DIFIS System’s composite riser tube
DIFIS System was developed for oil recovery from shipwrecks and for the elimination of the pollution threat during EU FP-6 framework. The installation time’s reduction in cases of environmental pollution is a crucial factor for DIFIS system design. In the current work, the polyethylene riser tube parts (15 meter) of DIFIS System was replaced by a composite riser tube parts (30 meter) succeeding lower installation time for the DIFIS’s riser. The analysis and development of composite riser was based on the verified 2 – way fluid structure interaction (FSI) results from polyethylene riser. A methodology based on polyethylene riser’s normal modes (target values) was proposed and the composite riser’s structural integrity was investigated in order to reach these target values. The normal modes analysis and the 2 – way fluid structure interaction simulation were performed in ABAQUS software. The composite riser’s dynamic response under sea current is significant better than polyethylene riser (lower displacements in both axes, parallel and vertical to flow). In overall, the time reduction of the DIFIS’ risers installation by 40% was achieved, using longer riser parts.
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