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 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 equal to 5460 kN and 4545 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 5000 kN). The tension extremes at all points along the pipeline are always positive, so the pipeline never goes into compression.
The bending moment envelope is presented in the second figure. The bending moment distribution remains more or less constant during the analysis. Some variations are evident in the overbend and the stinger tip region, but the variations are small in comparison with the overall magnitude of static moment present. These are caused by some intermittent contact occurring at the stinger supports in the overbend 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 the bending moment envelope. The Von Mises strain distribution remains more or less constant during the analysis, with some minor variations evident in overbend and in the stinger tip region. Again these are caused by intermittent pipeline-stinger contact occurring at the stinger supports.
Effective Tension Envelope
Bending Moment Envelope
Maximum Von Mises Strain Envelope