Results - Regular Wave Analysis
The regular wave analysis in this example corresponds to stage number 2. Results for this analysis are presented in the three figures below. Each plot represents an envelope of a particular parameter plotted against the curvilinear distance along the pipeline from the vessel connection point, ‘_TensionerVCP(1)’.
The effective tension envelope along the pipeline is shown in the first figure. At the tensioner end of the pipeline, the maximum and minimum values are approximately 2530 kN and 2080 kN respectively. This is consistent with expectations as the active linear tensioner applies a force within the deadband limits of the static tension (+-10 % of 2305 kN). The tension extremes at all points along the pipeline are always positive, so the pipeline never goes into compression.
The bending moment envelope along the pipeline is shown in the second figure. The greatest variations are present in the tower region, with minor peaks occurring at individual supports. These are caused by intermittent contact occurring at the supports as the vessel heaves and pitches in response to the applied wave loading. Some variations also occur in the touchdown zone and sagbend regions.
The maximum Von Mises stress envelope is plotted in the third figure. A similar trend is exhibited to the bending moment envelope. The maximum variations occur at the tower supports, caused by the intermittent pipeline-support contact.
Effective Tension Envelope
Bending Moment Envelope
Maximum Von Mises Stress Envelope