#STATIC ANALYSIS USING ORCAFLEX HOW TO#
#STATIC ANALYSIS USING ORCAFLEX FULL#

None: no seabed friction will be applied to the line during the statics analysis.

#STATIC ANALYSIS USING ORCAFLEX HOW TO#

This determines whether or not to include the effects of seabed friction on a line in the statics analysis and, if so, then how to go about applying this friction. This is a global setting which applies to all lines in the model. The line statics step 2 policy governs whether or not step 2 statics is calculated.

#STATIC ANALYSIS USING ORCAFLEX FULL#

Otherwise, the full statics calculation takes the result of step 1 statics as the starting shape for the line and finds an equilibrium position for the model, taking full account of bend stiffness and interaction with shapes. If none is selected then the position remains that at the end of step 1 statics.

The line statics step 1 policy governs whether or not step 1 statics is calculated. No calculations are involved, the nodes are simply placed at the given positions. User specified allows you to specify the position of each node on the line. The prescribed method is most suitable for pull-in analysis: you define the starting position of the line as a sequence of straight line or curved sections on the seabed. For such lines you might instead choose the spline solution, whereby the line is set to a 3D spline curve based on user-defined spline control points. While the catenary method is usually effective, some systems, such as those with slack or neutrally buoyant lines, can be troublesome. This is more sophisticated than the quick method because it accounts for effects such as seabed contact and buoyancy.Д¬atenary is the most commonly used method, wherein the static analysis finds the equilibrium catenary position of the line allowing for weight, buoyancy, and drag, but not bend stiffness or interaction with shapes.

The analytic catenary method uses an analytic catenary solver to determine the shape of the line.

The quick method provides a simple approximation that leaves the line in an approximate catenary shape, but neglects many effects that may be important, such as seabed contact and buoyancy. This can be quick, analytic catenary, catenary, spline, prescribed or user specified. The dynamic simulation will not proceed if any lines are excluded from statics: only the statics analysis is permitted. Results are not available for lines excluded from statics, and these lines have no influence on other objects in the model. In this situation you might find it helpful to exclude all the other lines from statics (which you can do conveniently via the all objects data form), allowing you to experiment with different statics convergence parameters for the problematic line in isolation.

This switch allows you to exclude a particular line from the statics analysis completely, and may be useful if, when building a model, you find a particular line is not converging. While global line statics policies give you model-wide control, there are also specific data which govern the statics calculation behaviour and methods of each individual line. The line statics calculation is one stage of the overall statics analysis in OrcaFlex.

Static analysis using orcaflex