OrcaFlex User Group 2003 Slide 1 of 10 OrcaFlex - Variable Data Presentation Outline So what is...

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OrcaFlex User Group 2003 www.orcina.com Slide 1 of 10 OrcaFle x - 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

Transcript of OrcaFlex User Group 2003 Slide 1 of 10 OrcaFlex - Variable Data Presentation Outline So what is...

Page 1: OrcaFlex User Group 2003  Slide 1 of 10 OrcaFlex - Variable Data Presentation Outline So what is Variable Data in OrcaFlex? Which data are.

OrcaFlex User Group 2003 www.orcina.com 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

Page 2: OrcaFlex User Group 2003  Slide 1 of 10 OrcaFlex - Variable Data Presentation Outline So what is Variable Data in OrcaFlex? Which data are.

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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

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OrcaFlex - Variable Data

Which Data are Variable?

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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)

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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?

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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

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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)

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OrcaFlex User Group 2003 www.orcina.com 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’

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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

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OrcaFlex - Variable Data

Conclusion

• General purpose ‘Variable Data’ code architecture

• Powerful functionality for modelling non-constant data

• Extended control over operational sequences