Significant effect on the object's buoyancy. The effect is usually not significant, but in some cases it can have a The calculation of hydrodynamic effects use the uncompressed volume and a nominal sea density value, which is taken to be the density value at the sea density origin.Īll things are compressible to some extent. OrcaFlex does not allow for compressibility or density variation when calculating hydrodynamic effects such as drag, added mass, etc. Note: The bulk modulus and density variation facilities in OrcaFlex only affect the buoyancy of objects. Would be unstable (the lower density water below would rise up through the higher density water above).įor buoys and lines these effects can be modelled in OrcaFlex. Normally the density increases with depth, since otherwise the water column The water density ρ can vary with position, either because of the compressibility of the water, or else because of If the object is compressible then its volume V will reduce with depth due to the increasing pressure. Reality the buoyancy does vary due to the following effects: Theīuoyancy is equal to ρVg, where ρ is the water density, V is the volume and g is the acceleration due to gravity. The buoyancy of an object is normally assumed to be constant and not vary significantly with position.
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