TEMPEST Level-0 Theory

Abstract

011 TEMPEST Level-0 Theory i REPORT DOCUMENTATION Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing this collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden to Department of Defense, Washington Headquarters Services, Directorate for Information Operations and Reports (0704-0188), 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS.PAGE SPONSOR/MONITOR'S REPORT NUMBER(S) DISTRIBUTION / AVAILABILITY STATEMENTApproved for Public Release; distribution is unlimited. SUPPLEMENTARY NOTES ABSTRACTTEMPEST 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.

Territoriality and migration in a divided society: Lay theories of citizenship and place in Northern Ireland.

“…Ethnographic studies indicate that this is attributable to the geographic variation in local demographic composition and intercommunity relations of local areas (Byrne, Hansson, & Bell, 2006). The consequences of contact encounters depend upon the history and composition of the residential contexts within which they occur and, although there is evidence of an overall increase in the level of intergroup contact among residents of mixed areas, this is often qualified by a level of strategic withdrawal at different times according to local political tensions (Hughes, Campbell, Hewstone, & Cairns, 2007;Hughes, Campbell, & Jenkins, 2011). Furthermore, ethnographic research points to a fundamental difference largely overlooked by survey research: the experience of contact is qualitatively different for those who have lived in mixed areas for some time compared to those who have recently arrived (Byrne et al, 2006;Stevenson & Sagherian-Dickey, 2016).…”