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Abstract
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The present study attempts to mathematically model forced roll
mechanism developed by Judge (2010) in order to determine
hydrodynamic roll coefficients. To achieve this goal, 2.5D
theory is used by which forces and moments acting on the
bottom of hull are determined. The pressure acting on each
section, is computed using potential theory, and considering
impact velocity as well as roll velocity. The roll moment acting
on each section is computed using pressure and the roll moment
acting on the craft is determined using integration of the
sectional moment. In addition, contribution of hydrostatic force
in restoring moment is taken into account. The hydrodynamic
and hydrostatic forces are reduced using a transom reduction
formula. It is attempted, to assess, validity of the present
method, by comparing predicted coefficient against previous
experimental data.
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