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Buoyancy Diameter

The buoyancy diameter (Db) is the effective outer diameter for buoyancy force calculations. For geometric properties in the Mooring Line format, Db defaults to Do, but you can override this. Db is also used in some circumstances in the calculation of the added mass/inertia components of the Morison’s Equation hydrodynamic force – this is discussed in Element Diameter and Hydrodynamic Forces.