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What was new in Version 4.1

QA Information dialog : Dealing with complex models throughout the whole duration of your project study requires to pay special attention to ensure adequate quality in files management. It is also of prime importance that your model files can be easily passed from one user to another without any loss of information. To help you in these tasks, we have developed a new QA Information dialog, in which you may input your name, the job number, job name, and the title for your analysis. In addition you may also enter any comment you like with no limitation on the number of text lines.

Multi-directional waves : Considering multi-directional waves is of great interest when dealing with environmental conditions typical of WoA for instance. DeepLines now allows to handle such waves when calculating the motion of support vessels through RAOs. In addition, the interpolation used in case where the wave heading does not match any of those defined in the original RAOs data has been considerably improved.

Flexible pipe hysteretic behavior : Non bounded flexible pipes may exhibit a highly non linear behavior when submitted to bending cycles. Due to the friction between adjacent internal layers, the curvature and bending moment are actually linked through an elasto-visco-plastic type relationship. Such laws and related algorithms have been implemented with the decisive support of Technip France. They are now available within DeepLines to help you better model such structures.

Floating hoses : Modeling pipes floating at the sea surface used to raise a number of tricky issues within the previous releases since the apparent weight was systematically used. The buoyancy force is now accurately calculated for surface piercing elements, as the immersed volume is derived from the sea surface and actual pipe geometry. The new formulation has been checked against theoretical cases and hydrostatic analyses for cylinders. This new feature is particularly useful to model offloading operations and riser tow out.

Faster post-processing : Post-processing has become much more faster thanks to optimization of routines used to extract the results from DeepLines binary data files. The effect is particularly noticeable when asking for envelops of variable along one line for example.

Definition of damping ratio : The previous releases already offered a wide range of possibilities to define structural damping ratios : simple Rayleigh type or damping by mechanism, with the values being allotted element per element. Though, the so-called β coefficients still depended on the motion frequency. In addition to the latter, you may now simply enter the actual damping rate ξ and let DeepLines automatically select the corresponding frequency.

Squall winds : In addition to the classical Harris, Davenport and API wind spectra, you may also define time-dependant winds. This new feature is useful to model the impact of squall winds on any kind of support vessel within your coupled mooring/riser analyses.

Improved animation player : The model browser tree-view now displays aside the animation player. This allows you to access the QA Information associated with the model directly from the simulation results file. Furthermore, you can also hide any selected object when playing the animation, which significantly improves the readability of both animations and AVI files.

Graphs related statistics : Statistics are automatically computed for each curve that displays in the post-processing plotting module. These include maximum, minimum and mean values, standard deviation, skewness and kurtosis. The table summarizing these statistics can be easily exported to Excel with a single click.

Additional wave spectra for WoA : Recent in-situ measurements by Optimer offshore Angola have highlighted the need for specific wave spectra. From now on, in addition to the classical Ochi-Hubble spectrum, DeepLines offers you such new Optimer spectra, which are based on multiple triangle peaks and Wallops distributions.

Computation of RAOs : RAOMaker, the separate software previously used to build RAOs from time traces of motion, tension or stresses and wave elevation, is now part of the GUI. You can now build RAOs for any variable you like motion, tension and stress of course but also curvature and angles for instance. The analysis is based on a discrete Fourier transform for multiple regular waves analyses, and the original cross-spectra method for irregular waves analyses.

Enhanced clearance checks : Post-processing of clearance between adjacent lines has been improved in several regards. First, the algorithm has become more accurate since it can now use control points independent of the initial FE segmentation exactly as our separate post-processor PoDeep does. These post-processing requests can also be defined in a very intuitive matrix form, the results .being displayed in the same way. Furthermore you may ask for the clearance between two lines which do not belong to the same analysis : this means that you are not obliged anymore to run complex and time consuming analyses when not strictly necessary. In addition, you can also ask for the time evolution of the distance between one point fixed on a line and any other line. This last feature then allows to estimate the impact velocity should clashing occur.

Online help redesign : The online help has been completely redesigned and is now based on the latest generation of help systems. This makes it significantly easier to navigate, but also improve readability. The help system content will be continuously upgraded over the next months with the users feedback, so as to reach maximum completeness.

What was new in Service Pack 4.1.5.7

This service pack integrates several corrections or improvements. A new optional function, called " zone study ", has also been added into the post-processing.

DeepLines solver :

  • Non-linear law with stiffeners : When the riser inside a stiffener is affected a non-linear law, the equivalent elements automatically generated are also affected a non-linear law. In the previous version, the asymptotic bending stiffness was the asymptotic stiffness of the pipe alone. Now, the stiffness of the stiffener is added to the asymptotic stiffness of the pipe.

  • Coupled analysis : This release better accounts for large variations of floaters headings. Moreover, for the Low Frequency option, the predictor/corrector algorithm has been corrected as there was an error in the formulation of the acceleration corrector.

  • Restart option : When a restart is done on a dynamic analysis at a specified time Tbeg, the ramptime RAMP is now taken into account from Tbeg to Tbeg + RAMP. Note that RAMP is automatically calculated when periodic loading is introduced but it can be explicitly defined in the "advanced" panel of a dynamic analysis.

DeepLines GUI :

  • Effective tensions in the cable elements,

  • Envelop requests,

  • Connection of a buoy to a rigid body,

  • Multi-linear laws for bars with more definition points (up to 100),

  • delete of analyses sets,

  • pop-up menu with "Generate DSS and LOG files",

  • Display of local built-in axes in DSK and DSS files,

  • Visualization of multi-waves during animations,

  • Export of statistics to excel : The last line was missing,

  • Export of a imposed motion to another DSK file : When the objects already exist, they are not created,

  • DeepLines solver is now launched with priority "NORMAL" instead of "LOW",

  • Batch results are exported after each request to avoid to lose everything in case of crash,

  • Wave spectra available in fatigue analysis panel,

  • Batch command to use the periodogram to extract RAOs from a time series.

Zone study:

This new optional function allows to define specific parts of a line by abscissa ranges and to request automatic post-processing on these parts for several analyses of the same DSK file. This is well adapted to the analysis of unbounded flexible risers but can be used for any kind of line. Two options are available : "extreme" and "fatigue" analyses.