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Orcaflex examples tank ballast3/3/2024 The stack built of these cylinders represents the buoy geometry from which buoyancy forces and moments are determined. The diameters and length of each cylinder. Cylinders: outer diameter, inner diameter and length The centre of the base of the stack, relative to buoy axes. The shape of a spar buoy or towed fish is determined by its geometry data. If you are modelling a CALM or SPAR buoy in particular, there are extensive guidelines for setting up your model under the topic modelling a surface-piercing buoy. This may seem counter-intuitive but it means that tables on the buoy data form, arranged in cylinder order, then have the same ordering as a vertically-oriented spar buoy with the cylinder at the base of the stack (lowest $z$) being at the bottom of the table. The cylinders are numbered backwards along their axis. In either case we call this series of cylinders the stack. The geometry of a towed fish is identical except that the symmetry axis is aligned with the local $x$-axis. 6D buoys: Spar buoy and towed fish propertiesĪ spar buoy is defined relative to the buoy local frame of reference $\Bxyz$, and is built from a series of coaxial cylinders mounted end-to-end along the local $z$-axis.
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