Internal Fluid

Defines the internal fluid contents in a line type.

Alternatively, a Main Riser Line may be used to define continuous contents of several lines.

If no contents are specified, the line is assumed to be empty.

The internal pressure will be calculated from the inlet pressure, the pressure drop and length from the inlet end, and the density and vertical distance from the inlet. end.

The density of the contents affects the mass of the elements and Will contribute to the volume forces and inertial loads.

The internal pressure will normally not influence the global static or dynamic behaviour of the system and, in particular, not influence the effective tension.

The exception is if a nonzero pressure expansion coefficient is specified for the cross-section, the stress-free element lengths will depend on the internal pressure.