OrcaFlex User Group Slide 1 of 10 OrcaFlex - Variable Data Presentation Outline So what is Variable Data in OrcaFlex? Which data are variable? Hydrodynamic Variable Data Load Variable Data Externally calculated data Structural Variable Data

OrcaFlex User Group Slide 2 of 10 OrcaFlex - Variable Data What is Variable Data? Previously, most user defined data was treated as a constant throughout the simulation Now, certain data can vary during the analysis - in a pre-determined manner These can be as a function of simulation time, or of another variable External Functions: Allow interface with user defined external software

OrcaFlex User Group Slide 3 of 10 OrcaFlex - Variable Data Which Data are Variable?

OrcaFlex User Group Slide 4 of 10 OrcaFlex - Variable Data Hydrodynamic Variable Data(1/2) Current Direction = F(Simulation time) Current Speed = F(Simulation time) What do these allow me to model? Loop currents (change both speed and direction) Tidal cycles Pre-determined shielding of current Horizontal Variation Factor = F(Distance)

OrcaFlex User Group Slide 5 of 10 OrcaFlex - Variable Data Hydrodynamic Variable Data(2/2) Drag Coefficient = F(Reynolds No., Re = V.D / ) Fluid Temperature = F(Water Depth) Kinematic Viscosity ( ) = F(Temperature) Normal Drag as a function of Re What do these allow me to model?

OrcaFlex User Group Slide 6 of 10 OrcaFlex - Variable Data Load Variable Data Load Force = F(Simulation time) Load Moment = F(Simulation time) Tension = F(Simulation time) What do these allow me to model? Time varying forces & moments on Vessels and 6D Buoys (use OrcaFlex as a ‘Simulator’) Sophisticted winch tension sequences

OrcaFlex User Group Slide 7 of 10 OrcaFlex - Variable Data Structural Variable Data(1/2) Axial Stiffness: % Strain vs. Tension Bending Connection Stiffness: BM vs.  Angle Bend Stiffness: Bend Moment vs. Curvature What do these allow me to model? Non-linear axial stiffness (for man-made ropes) Non-linear Bend Stiffness (esp Bend Limiters) Non-linear con. stiffness (Bend Stiffeners)

OrcaFlex User Group Slide 8 of 10 OrcaFlex - Variable Data Structural Variable Data(2/2) Expansion Factor = F(Simulation time) Payout Rate = F(Simulation time) Wing Orientation = F(Simulation time) What do these allow me to model? Line thermal expansion effects More winch control sophistication Control how much lift is generated for ‘birds’

OrcaFlex User Group Slide 9 of 10 OrcaFlex - Variable Data Externally Calculated Data User defined external functions What do these allow me to model? User defined software called repeatedly Re-calculates value of Variable Data item Passes this back for OrcaFlex to use

OrcaFlex User Group Slide 10 of 10 OrcaFlex - Variable Data Conclusion General purpose ‘Variable Data’ code architecture Powerful functionality for modelling non-constant data Extended control over operational sequences