Development of Wind and Current Coefficients for Multiple U.S. Navy Vessel Analysis Using OPTIMOOR

OPTIMOOR is a computer program for analyzing moored vessels; however internal parameters currently are limited to non-military vessels. If U.S. Navy vessels are to be analyzed, the wind and current coefficients within OPTIMOOR need to be developed, this paper presents how this is done. OPTIMOOR uses a modified coordinate system opposite to that used by the U.S. Navy when analyzing moored vessels at a berth. Currently OPTIMOOR does not have wind and current coefficient files for U.S. Navy vessels, limiting its users to analyzing commercial vessels such as tankers, bulk carriers, etc. Outlined within this paper are: (1) the methods used to calculate wind and current coefficients for single vessels in accordance with U.S. Navy guidelines, (2) a description of the data trends outlined in current U.S. Navy reports for wind and current forces and moments on multiple vessels, (3) how these data trends are used to modify single vessel coefficients to account for nested vessel affects, and (4) how the modified coefficients are then converted to the coordinate system used within OPTIMOOR.