OC4 P1 LC2.3b Deans Wave |
 
|
OC4 P1 LC2.3b Deans Wave |
|
Although this load case is not discussed by Popko et al. (2012), results exhibited here show similar trends to the previous load case, OC4 P1 LC2.3a, which considers Airy wave loading rather than a Dean's stream wave.
The vertical force at the mudline predicted by Flexcom shows good agreement with the other software tools. As outlined in OC4 P1 LC2.1, the project participants which omitted the buoyancy force at the mudline predict a mean vertical force at about -16600 kN, while others (including Flexcom) which included this term predict a mean vertical force of about -15800 kN. Differences in peak-to-peak amplitude of vertical force are mainly due to the buoyancy calculation method, whether displaced volume or pressure integration. Additionally, different masses for the jacket substructure and marine growth contributed to discrepancies.
Very close agreement is shown between all software tools for the fore-aft shear force at the base of the jacket. Minor discrepancies in peak-to-peak amplitude may be caused by dissimilarities in implementations of wave kinematics, or slight differences originating in the modelling of the support structure. Results from SWE/Flex5-Poseidon appear out of phase with the other tools - a minor fault in the software at that time caused an unexpected frequency shift in the output.
