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Introduction

List of Development Priorities as seen by Orcina. Introduction. Influenced by Feedback from Clients Informed by Orcina use on Consultancy work Our own understanding of the code  enhanced features Occasional paid developments. Can never promise to implement.

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Introduction

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  1. List of Development Priorities as seen by Orcina Introduction • Influenced by • Feedback from Clients • Informed by Orcina use on Consultancy work • Our own understanding of the code  enhanced features • Occasional paid developments • Can never promise to implement • Following list is in no particular priority or order

  2. Non-linear & suction seabed Implement a user specified piecewise linear force vs. depth of penetration curve allows non-linear soil reactions, and also modelling the effects of suction on line emergence • 3D seabeds • allows user defined 3D seabed profile • means friction bias model would have to change

  3. OrcaFlex speed up • use of implicit and / or variable step integration schemes • adopting FE techniques such as static condensation • ‘Model Analyser’ to help user improve the model and run time • Frequency Domain • could linearise everything and do the usual thing • alternative: FFT an OrcaFlex white noise simulation to give ‘non-linear’ RAOs • using these is more accurate

  4. Vessel motions via force RAOs & convolution • will allow vessel motions to be calculated from the forces acting • includes the effects of attached lines • ideal for jetty moorings, tandem moored vessels and bundle tow-out analysis • users will need to define a hydrostatic stiffness matrix • Rendered graphics • to produce 3D rendered images of simulation or data files • available as an add-on option • Perspective and hidden line allowed for • can ‘fly’ through the model

  5. Pipe flooding / slugging • simulate transient mass flow in lines • Payout of OrcaFlex lines • aka ‘Node Feeding’ • ability to change line length during simulation • winch wire does this but excludes mass and hydrodynamic forces • problem is we are creating / destroying mass!

  6. Wake deficit • model altered flow behind upstream line • impacts on downstream line • 2D theory (Huse), needs generalising to 3D • Spar buoy ID • allow specification of internal diameter • then no need for added mass / lost buoyancy approaches

  7. VIV developments • allow export of Shear7 Structural file • full integration of Shear7 with OrcaFlex (as per VIVA) • further work on vortex tracking • coupling with CFD • Hydrodynamic modelling • Range of interfaces to other hydrodynamic packages • library of standard vessel hydrodynamics • Automation • further developments to OrcaFlex automation

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