This surface-piercing model enables OrcaFlex to model systems such as floating hoses, containment booms and wave suppression systems.
Proportion wet for a surface-piercing segment
The intersection of the diagonal line with the surface continues to give the appropriate proportion wet result, and the hydrostatic and dynamic forces are attributed correctly to the appropriate node. As the segment passes through the tangent position, the diagonal line switches corners but the proportion wet varies continuously. Rather than the centreline axis, we use the diagonal line joining the highest point on the segment circumference, at the 'dry' end, with the lowest point at the 'wet' end: the diagonal line in the figure below. Instead, OrcaFlex uses a simple but effective modification of this concept. This simple approach breaks down, however, when the segment becomes tangential to the surface.
WHICH THEORY THE ORCAFLEX IS BASED ON FREE
We also define proportion dry as $1\PW$.įor a segment whose axis is close to normal to the surface, the proportion wet could be calculated from the intersection of the segment centreline axis with the free surface. Proportion wet is available as a line result. For a partially submerged segment, the hydrostatic and hydrodynamic forces are apportioned according to how much of the segment is submerged – the proportion wet, $\PW$. OrcaFlex lines are subdivided into segments, and the various forces are attributed to nodes at the ends of each segment. by extracting drag and added mass coefficients from CFD simulations or to specify dynamic loads to structural models).Line theory: Interaction with the sea surface Our expertise in the global analysis work is further enhanced by our other core capabilities, which we can integrate to create higher accuracy models (e.g.
WHICH THEORY THE ORCAFLEX IS BASED ON SOFTWARE
Using this tool we are able to model the inherently non-linear response of subsea equipment in both the time and frequency domain and assess a diverse range of dynamic offshore marine systems in an efficient and productive way.Īs with any other engineering software, the true value that OrcaFlex creates is only accessible by having a deep engineering knowledge and experience, which is where we come in: we are expert users of the software and have a deep knowledge of the industry and regulatory frameworks (DNV, API, etc) and are internationally recognised as a leading authority in delivering advanced global analysis on increasingly complex engineering projects. OrcaFlex is a powerful tool that encompasses a large variety of objects and features which enable assessing complex systems and applications through a mathematical model. Offshore marine systems design is a complex undertaking which is highly regulated and carries significant risk, and for which even small improvements can significantly increase safety and reduce costs.Īt PDL we undertake dynamic analysis of offshore marine systems using the world’s leading package software OrcaFlex in order to assess and optimise new and existing offshore marine designs and operations.
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