HYDRAN Page of OffCoast, Inc.

HYDRAN

HYDRAN is a computer program for the three-dimensional HYDroelastic Response ANalysis of floating or fixed offshore structures. It has been designed from the ‘ground-up’ to analyze the wave-induced response (motions, displacements, and structural forces and stresses) of flexible (deformable) structures. The hydrodynamic motion response of a single rigid body and of multiple rigid bodies are treated as subsets of the more general formulation for flexible structures.

The theory underlying HYDRAN includes:

Linear hydroelasticity
- One or more rigid bodies unconnected
- Multiple rigid bodies flexibly connected
- One or more flexible bodies, connected or disconnected

Linear hydrodynamics
- 3-D linear potential theory
- Green function method
- Constant panel formulation
- Complete structure-fluid-structure interaction
- Infinite or finite water depth
Linear structural dynamics
- Finite element or analytical model
- ‘Direct’ or ‘reduced-basis’ (assumed modes) approaches
- Linear mooring stiffness
Frequency domain solution
- Transfer functions for responses
Response quantities which can be obtained include:
- Structural displacements at any point
- Structural forces and stresses (depends on structural model)
- Fluid potential/velocity on the wetted surface
- Fluid pressures on the wetted surface
Key features of HYDRAN include:
- Number of fluid panels only limited by computer memory
- Quadrilateral and/or triangular fluid panels can be used
- Double, single, or no structural symmetry options
- For large structures, double symmetry can reduce the memory and computational requirements to 1/16 of that for no symmetry
- Response of multiple flexible and/or rigid bodies
- Detailed control over solution process
- Extensive set of commands to manipulate response data
- Scripting language
- On-line user manual
- Easily ported to wide variety of hardware
- Windows 98/Me/2000/XP/Vista; Macintosh
- Any consistent unit system can be used