Advanced Methods for Ship Motion and Wave Load Prediction
Abstract
A numerical method for the simulation of ship motions, hull girder loads and transient three-dimensional hydrodynamic pressure is developed. A time-step integration of the equations of motion is performed with sectional hydrodynamic forces computed using strip theory and buoyancy forces evaluated over the instantaneous immersed hull. In addition to hydrostatic and dynamic buoyancy forces, ship motion induced and wave diffraction forces, the method can also account for flare force and quadratic damping forces. The numerical model also has several features which may provide for more realistic simulations. Linear wave theory is assumed for the representation of the incident wave field, and regular and irregular, unidirectional of multidirectional wave systems can be generated. A method for the prediction of transient three-dimensional hydrodynamic pressures extending the technique developed by R. B. Chapman is presented. Initial and boundary values for the pressure simulation are simultaneously generated from the solution of equations of motion using sectional force computations. An option exists in the program to substitute the three-dimensional pressures for the two-dimensional hydrodynamic forces. The numerical methods and computer programs require further testing, validation and improvement.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1990
- Accession Number
- ADA227199
Entities
People
- James C. Oliver