Analysis Component |
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Analysis Component |
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The Analysis component is used to specify the various inputs for a PipeLay analysis. The Analysis component allows you to gather together a set of components of various types, such as pipelines, vessels, waves and so on, from all of those defined in a project file, and to perform various types of analyses using these components. In this example, the Analysis component is named ‘Pipe-in-Pipe Analysis’. The following sections provide a description of the various inputs for the analysis.
The Properties tab allows you to specify the options that are to be applied to all analysis stages of a particular model. In this example the Model is selected as ‘Model’ and the Contact Modelling option is defined as Simple. The Tolerance dialog in the Dynamic section has the properties listed in the table below.
Table: Dynamic Tolerance Properties
Property |
Value |
Tolerance Measure |
0.001 |
Maximum Number of Iterations |
1000 |
Small Torque Value |
1 x 109 Nm |
The Installation Stages tab is where you define the various stages in your analysis. In this example there are two stages. In this example there is one static stage and one dynamic stage, with the dynamic stage restarting from the initial static stage. The regular wave is applied in the dynamic stage. The table below shows the time variables used in the dynamic stage. In order to optimise efficiency, no Automated Postprocessing or Tabular Output is requested (i.e. No is selected in both the Automated Postprocessing and Tabular Output drop-down lists). Customised postprocessing is requested, by referencing an appropriate Custom Postprocessing component for each stage, as described in the following sub-section.
Table: Time Variables for Dynamic Analysis
Property |
Value |
Time Step Type |
Fixed |
Start Time |
0 s |
End Time |
50 s |
Time Step |
0.05 s |
Ramp Type |
Nonlinear |
Ramp Time |
20 s |
The Custom Postprocessing component allows you to request specific results in addition to those provided automatically by PipeLay. It is useful in this instance, as it allows you to obtain results separately for the outer and inner pipes.
So two Custom Postprocessing components entitled ‘Custom Static Plots’ and ‘Custom Dynamic Plots’ are created in the Postprocessing folder, and are referenced on the Installation Stages tab of ‘Pipe-In-Pipe Analysis’. Effective tension and bending moment distributions in the outer and inner pipes are requested for the static analysis, and corresponding envelopes are requested for the dynamic analysis.
We are now ready to run the analysis. While the analysis is running we can observe the analysis progress and check for warnings or errors on the Progress tab.