TEMPEST Level-0 Theory
2011
Hughes, Michael J | Campbell, Bradley L | Belknap, William F | Smith, Timothy C
TEMPEST is a computational tool that is being developed to predict the seakeeping and dynamic stability performance of a steered ship in large waves. The theory for TEMPEST is being developed in several levels. The difference between the theory levels is in the fidelity and complexity of the environment definition and the component force models. This report describes the Level-0 theory. The objective of the Level-0 version of TEMPEST is to establish a working computational tool that provides reasonable seakeeping predictions and to establish the framework of the TEMPEST tool into which the more accurate Level II and Level III models can be implemented. The Level-0 theory is based on simple models that include a linear hydrodynamic force model based on user-supplied added mass and damping coefficients, a nonlinear model for the hydrostatic and Froude-Krylov forces, and empirical models for the maneuvering forces and the forces from the bilge keels, rudders and propeller. This report is a compilation of the equations of motion, wave environment, and component-force theory white papers provided to the TEMPEST code developers, DRS Defense Solutions, for implementation of the Level-0 theory.
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