The value you return should typically be the torsional stiffness corresponding to zero twist. With this value of Action the external function is requested to return the nominal value of torsional stiffness in the lpExtFnInfo->Value field. To cater for this a special call to the external function is made with lpExtFnInfo->Action set to eaCalculateNominalValue. The OrcaFlex calculation needs to know a 'nominal' value of torsional stiffness for various auxiliary requirements.
Because of this each node in a section with externally calculated torsional stiffness has a separate instance of an external function record. There may be many nodes in potentially many different lines which use the properties of any single line type. The torsional stiffness data are specified on the line type form in OrcaFlex. Externally calculated torsional stiffness deviates from this pattern. External function instancingįor other external functions in OrcaFlex there is a one-to-one relationship between data items specified to be externally calculated and instances of an external function record ( TExtFnInfo). It is the torque in these torsional springs that the external function implements. Each segment therefore has an torsional spring stiffness based on the line type torsional stiffness value.
In turn, each section is represented by a number of nodes and segments. OrcaFlex lines are made up of sections and each section has properties as specified by an OrcaFlex line type. The procedure involved is more complicated than for other external functions and is described in detail below. OrcaFlex line types allow the torsional stiffness data to be externally calculated. Externally calculated torsional stiffness
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