Below is a list of links to OrcaFlex example topics. Within each topic are a number of examples which each comprise one or more simulation files, a description pdf file, workspace files and sometimes other supporting files. The files for each example are zipped for easy download. The simulation files can be opened and viewed with the demonstration version of OrcaFlex.
In this example, four types of riser system are shown: a simple catenary, a lazy wave, a steep wave and a pliant wave.
The examples illustrate:
In this set of examples, three types of riser system are shown: a lazy S (both simple and detailed), a steep S and a pliant S. Generally, an S configuration is similar to a catenary but has support provided by an arch structure at a midwater depth.
The examples also show:
Flexible jumpers connect a spread-moored FPSO to a high riser tower in deep water, i.e. the tower top is close to the surface. The lines descend to the seabed as rigid structures clamped around the tower. An installation of this type can be found in the Girassol field.
The example illustrates:
This model represents an FPSO system with a releasable turret. Disconnecting systems are found in regions where typhoons or ice flows are common. It allows the vessel to be removed until conditions improve.
The turret can be lowered from the vessel with winches. However, downtime is expensive, so operators prefer to keep producing until the last moment before disconnecting the turret and departing the field. The turret drops below the severe weather until the FPSO returns to reconnect.
The turret system needs to be designed so there are acceptable responses in all three phases.
This example contains three examples of steel catenary risers (SCRs).
These are:
The example also illustrates:
This example illustrates how to access the OrcaFlex interface to SHEAR7, using the steel catenary riser system considered in the A05 Catenary with spar example.
SHEAR7 is a third-party program, distributed by AMOG, which performs frequency domain VIV analysis. A separate licence is required to run SHEAR7 through the interface. However, the example results can be viewed without a SHEAR7 licence.
The purpose of the example is to demonstrate how to access the interface, what input data are required and how to access the VIV results. The example does not address how to choose appropriate values for the SHEAR7 data inputs, as these relate to SHEAR7 itself, rather than the OrcaFlex interface.
