6.3. HydroDyn Users Guide and Theory Manual

This document offers a quick reference guide for the HydroDyn software program. It is intended to be used by the general user in combination with other OpenFAST manuals. The manual will be updated as new releases are issued and as needed to provide further information on advancements or modifications to the software.

The documentation here was derived from HydroDyn Manual for HydroDyn version 2.00 by J.Jonkman et al.

• 6.3.1. Introduction
• 6.3.2. Input Files
  • 6.3.2.1. Units
  • 6.3.2.2. HydroDyn Driver Input File
  • 6.3.2.3. HydroDyn Primary Input File
  • 6.3.2.4. Environmental Conditions
  • 6.3.2.5. Waves
  • 6.3.2.6. 2nd-Order Waves
  • 6.3.2.7. Current
  • 6.3.2.8. Floating Platform
  • 6.3.2.9. 2nd-Order Floating Platform Forces
  • 6.3.2.10. Floating Platform Force Flags
  • 6.3.2.11. Platform Additional Stiffness and Damping
  • 6.3.2.12. Axial Coefficients
  • 6.3.2.13. Member Joints
  • 6.3.2.14. Member Cross-Sections
  • 6.3.2.15. Hydrodynamic Coefficients
  • 6.3.2.16. Members
  • 6.3.2.17. Filled Members
  • 6.3.2.18. Marine Growth
  • 6.3.2.19. Member Output List
  • 6.3.2.20. Joint Output List
  • 6.3.2.21. Output
  • 6.3.2.22. Output Channels
• 6.3.3. Output Files
  • 6.3.3.1. Echo Files
  • 6.3.3.2. Wave-Elevations File
  • 6.3.3.3. Summary File
  • 6.3.3.4. Results File
• 6.3.4. Modeling Considerations
  • 6.3.4.1. Waves
  • 6.3.4.2. Strip-Theory Model Discretization
  • 6.3.4.3. Domain for Strip-Theory Hydrodynamic Load Calculations
  • 6.3.4.4. Strip-Theory Hydrodynamic Coefficients
  • 6.3.4.5. Impact of Substructure Motions on Loads
  • 6.3.4.6. Platform Additional Stiffness and Damping
  • 6.3.4.7. Fixed-Bottom Substructures
  • 6.3.4.8. Floating Platforms
• 6.3.5. HydroDyn Theory
  • 6.3.5.1. Coordinate Systems
  • 6.3.5.2. Wave Kinematics
  • 6.3.5.3. Current Model
  • 6.3.5.4. Potential Flow Theory
  • 6.3.5.5. Morison’s Equation
• 6.3.6. References
• 6.3.7. Appendix
  • 6.3.7.1. HydroDyn Input Files
  • 6.3.7.2. HydroDyn List of Output Channels