Results - Regular Wave Analysis
The regular wave analysis in this example corresponds to Stage 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. The variation is relatively constant throughout the pipeline with a range of 640 kN at the tensioner, which is in line with a default tensioner deadband of +/-10%. The tension extremes at all points along the pipeline are always positive, so the pipeline is never in compression.
The bending moment envelope is presented in the second figure. The bending moment distribution remains more or less constant in the vessel and seabed connection point regions; however the variation of values in specific regions is significant. These large variations are observed predominately at the end of the stinger and in the sagbend region, in excess of 3000 kN.m, but gradually recede as the line moves towards the seabed connection point. The main cause of these differences is intermittent contact occurring in the stinger tip region as the vessel heaves and pitches in response to the applied wave loading.
The maximum Von Mises strain envelope is plotted in the third figure. A similar trend is exhibited to that of the bending moment envelope. The Von Mises strain distribution remains more or less constant in the vessel and seabed connection point regions, but experience major variations at the end of the stinger and in the sagbend, approximately 0.1%.
Effective Tension Envelope
Bending Moment Envelope
Maximum Von Mises Strain Envelope