Linear interpolation is used to obtain the density at intermediate levels, and the data are truncated at both ends of the table. Interpolated allows you to specify a density profile as a table of density against depth.The bulk modulus quantifies the degree to which a given mass of water shrinks under pressure, using the same volume formula as for buoys and line types OrcaFlex derives the density variation with depth assuming that the water column has the given bulk modulus and is at uniform temperature and salinity. You must specify the water's surface density and bulk modulus. Bulk modulus indicates that the density varies with depth purely due to the compressibility of the water.Constant allows you to specify a single density value which applies at all depths.The vertical density variation may be set to one of the following: Vertical density variation governs whether, and how, the water density varies with depth. For these effects, and for object properties reports (where the object position is not known), a nominal sea density value is used, which is taken to be the density value at the sea density origin. OrcaFlex does not allow for density variation when calculating hydrodynamic effects such as drag, added mass, etc. Note:ĭensity variation only affects the buoyancy of objects. For some systems, however, density variation is important because it causes buoyancy variation.
This is the most common value to use, since in most models the effects of density variation are not significant. The sea density can be constant at all positions in the sea or it can vary with depth and/or horizontal position.īy default the sea density is constant.