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New Features in GeniE, DeepC and HydroD

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Seminar "Sesam Present & Future" in Rio on Sept 2nd 2011, presented by Ole Jan Nekstad

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New Features in GeniE, DeepC and HydroD

  1. 1. 1SesamTM40 years of successNew features in GeniE, DeepC and HydroDJune 2011Ole Jan Nekstad, Sesam Product Manager, DNV Software20 August 2011
  2. 2. Supporting Win XP, Win 7 and Win Vista Main new features 32bit as well as 64bit  GeniE v5.3  DeepC v4.5 1. Beam deflection reporting 1. Regular wave condition 2. Flexible code checking of beams 2. Direction dependent scatter diagram 3. Import of old Sesam frame models 3. Parallel execution 4. Import of old Sesam soil models 4. Cross-section and fatigue analysis of umbilicals 5. Import of results from super element analysis  HydroD v4.5 6. Wave load analysis including local shell 1. Multibody additional damping models 2. Compartment load retrieval independent of 7. Easier modelling of planar surfaces sub-model 8. More advanced use of cut plane 3. User defined pressure reduction region 9. More features for making geometry 4. User defined reference point for calculation of results 10. Faster updating of finite element models 5. Automatic proposal for the number of 11. Become more efficient by using scripting panels needed for an optimum analysisSesamTM20 August 2011© Det Norske Veritas AS. All rights reserved. 2
  3. 3. DeepC, GeniE and HydroD part of Sesam 2011 Aug DVDSesamTM20 August 2011© Det Norske Veritas AS. All rights reserved. 3
  4. 4. GeniE v5.3 - Benefits A major focus of this release has been to ease the work to do beam deflection reporting and to model complex surfaces. Another main reason for the release has also been to allow for import of old frame models and results to do result presentation and code checking in GeniE - a typical example of such is the import of data from existing SRS (structural reanalysis systems). Finally, we have made the code checking more flexible. To better support design requirements, users will now have the possibility of not strictly following the interpretations as given by the various statutory regulations, which can be over conservative.SesamTM20 August 2011© Det Norske Veritas AS. All rights reserved. 4
  5. 5. 1. GeniE – beam deflection reporting  Easier to document compliance with statutory requirements - Beams with one finite element - Cubic interpolation and local loads - Scanning many load cases - Check against AISC levels 180, 240 and 320SesamTM20 August 2011© Det Norske Veritas AS. All rights reserved. 5
  6. 6. 2. GeniE – more flexible code checking of beams  User controlled options added to over-rule defaults in code checking standards - Standards some times to conservative - User controlled options may lead to non-conservative results  Run larger number of load cases for code check (AISC, EC, ISO) - Does not store all loads and code checking results - This is the default setting for a code check run  Code check updates Use of default max - AISC: Exclude torsion effects when computing bending moment vonMises stresses (Chapter G) - Eurocode: Include plastic moment of inertia in formulae 6.2 - API (WSD/LRFD), AISC (ASD/LRFD), ISO, Norsok: Use of local bending user to decide max bending option (default) or local moment bending moment  Label code check buckling lengthsSesamTM20 August 2011© Det Norske Veritas AS. All rights reserved. 6
  7. 7. 3. GeniE – import old Sesam frame models  Import old frame & planar plate models and retain finite element numbering system - You may modify material & section properties, beam eccentricities as well as plate thicknesses Preframe model - Wajac load files automatically imported - File Import FEM file Model imported in GeniESesamTM20 August 2011© Det Norske Veritas AS. All rights reserved. 7
  8. 8. 4. GeniE – import old Sesam soil models  Import old soil models and convert them to environment definitions - Should be done prior to any modelling as a default environment with water depth 10 m is created - File Import GENSOD file Model imported in GeniE Manual input formatSesamTM20 August 2011© Det Norske Veritas AS. All rights reserved. 8
  9. 9. 5. GeniE – import of results from super element analysis  Use results generated outside GeniE for post-processing and code checking - Super element analysis, merge operations in Prepost - Old analysis together with import FEM and retain numbering system (e.g. SRS models) - Add yield data to material properties - File Import External Results SIN file 1. Import FEM 2. Import SIN Wave loads part of FEM importSesamTM20 August 2011© Det Norske Veritas AS. All rights reserved. 9
  10. 10. 6. GeniE – wave load analysis including local shell models  Run large wave load analysis with multiple local shell models - Limitation of beam elements increased from 20.000 to 60.000 beams, hence possible to run large analysis models without the use of super element technique - Number of time steps in wave load analysis increased from 8.192 to 262.144 time steps – it is now possible to run with much smaller time steps to capture peaks - Boundaries for local shell model (loads and stiffness) automatically generated and updated - Load-cases for minimum shear and overturning moment in addition to maximumSesamTM20 August 2011© Det Norske Veritas AS. All rights reserved. 10
  11. 11. 7. GeniE – easier modelling of planar surfaces  Flat region modelling enables modelling of closed surfaces by single user operations - No longer needed to split continuous lines to create plates - Saving up to 4-5 user operations per plate - Insert  Plate  Flat Region Flat region tool sets up a The boundaries Each plate can be temporary cut-plane automatically created by clicking a defined by user shown closed areaSesamTM20 August 2011© Det Norske Veritas AS. All rights reserved. 11
  12. 12. 8. GeniE – more advanced use of cut plane  The Point/Vector and 3-Points cut plane makes dividing structural parts much easier - Previously limited to global axis planes The temporarily cut plane is perpendicular to axis Point1 -> Point8SesamTM20 August 2011© Det Norske Veritas AS. All rights reserved. 12
  13. 13. 9. GeniE – more features for making geometry  Scaling and offsetting of curves and surfaces makes it easier to make regular as well as complex geometrical shapes - Scaling around a point is often used to create similar shapes for the purpose of making structure and controlling finite element mesh, Edit  Copy - Offsetting will create similar shape (line or surface) in a given distanceSesamTM20 August 2011© Det Norske Veritas AS. All rights reserved. 13
  14. 14. 10. GeniE – faster update of finite element mesh  When properties are modified, but the topology is unchanged the creation of a finite element mesh can be much faster. For large models, significant performance improvements are achieved when updating analysis models - Always Regenerate Mesh: Regenerates all, takes the longest time, same as before, default option - Conditional Regenerate Mesh: GeniE detects what to do, regenerate all or just update properties (materials, sections, thicknesses) or load intensities - Never Regenerate Mesh: Updating properties and load intensities - Edit  Rules  Meshing Option: Never Regenerate MeshSesamTM20 August 2011© Det Norske Veritas AS. All rights reserved. 14
  15. 15. 11. GeniE – become more efficient by using scripting  The GeniE SnackPack gives you access to a number of script utilities that you can use to improve your performance - Access from DNV Software web site under downloads (https://projects.dnv.com/sesam/Genie_utils/index.html) - Learn from pre-defined scripts and make your own Example: How to convert a beam model to a shell model?SesamTM20 August 2011© Det Norske Veritas AS. All rights reserved. 15
  16. 16. GeniE v6.0 – Benefits Full support of 64 bit technology will give our users access to “unlimited amount” of memory. This will in particular help out when modelling very large models, but also during code checking of models with a significant number of load cases. Furthermore, it can import additional Sacs data and the code checking has been made even more flexible for the ISO standard. Scheduled for release September 2011. It is not part of the Sesam 2011 August DVD, but can be downloaded from our Customer PortalSesamTM20 August 2011© Det Norske Veritas AS. All rights reserved. 16
  17. 17. Main new features version 6.0-**  True 32 and 64 bit applications – “unlimited access to data memory”  Enhanced import of Sacs data – load combinations, improved handling of beam line and point loads, and support for additional profile libraries  Beam code check updates - ISO standard: Check of critical joints where factor Ub can be computed by GeniE based on member code check. Users can also specify minimum allowed value of Ub - ISO standard: Added an alternative formula for X-joints in tension (OMAE2008-57650(8)) - Perform code check of very large models by saving results on a new format (file and not database) – significantly reduced risk of running out of virtual memory  Reporting: Save report to CSV format in addition to txt, html, Word(xml), Excel(xml)  Much faster display of plates and beams, both structure and mesh view, possibly up to an order of magnitude for large models  Change properties for existing support points and point masses without the need to always regenerate the finite element mesh  Combine imported result cases for use in result presentations and code checkingSesamTM20 August 2011© Det Norske Veritas AS. All rights reserved. 17
  18. 18. DeepC v4.5 – Benefits A major update of this release is the possibility to use regular waves in addition to irregular waves for fatigue analyses. Compared with irregular wave fatigue used for detailed fatigue analysis, the new regular wave fatigue functionality let the user get the fatigue results much quicker in the initial design process. Other important benefits are the handling of direction dependent scatter diagrams and parallel execution to run an arbitrary number of analyses at the same time. DeepC also supports cross-section drawings, cross-section analysis (capacity curves) and fatigue analysis of helix elements in umbilicals and flexible risers. DeepC has thus become a complete solution for all slender structures like risers, mooring lines and umbilicals.SesamTM20 August 2011© Det Norske Veritas AS. All rights reserved. 18
  19. 19. 1. DeepC – include regular wave condition  Main benefit: Regular in addition to irregular wave conditions  A typical regular wave fatigue analysis approach is similar to irregular wave fatigue analysis, which normally includes: - Creating multiple regular waves and multiple regular time conditions based on a height/time scatter diagram - Specifying a number of periods (typically 10) based on a predefined analysis template - Running all the analyses and making a fatigue analysis. During the analysis, an explicit time interval may also be given  Regular wave conditions can also be used in a coupled analysis. Regular wave shownSesamTM20 August 2011© Det Norske Veritas AS. All rights reserved. 19
  20. 20. 2. DeepC – direction dependent scatter diagrams  Main benefit: The definition of multiple scatter diagrams  This functionality will make it much easier to handle direction dependent scatter diagrams. - Users just need to specify the probabilities of each scatter discretization as shown in the figure to the right. - The new functionality applies both to regular and irregular wave scatter diagrams.SesamTM20 August 2011© Det Norske Veritas AS. All rights reserved. 20
  21. 21. 3. DeepC – parallel execution  Possible to run an arbitrary number of analyses in parallel. - This will lead to reduction in analysis elapsed timeSesamTM20 August 2011© Det Norske Veritas AS. All rights reserved. 21
  22. 22. 4. DeepC – cross-section and fatigue analysis of umbilicals  Sesam extends its portfolio by providing tools for cross-section analysis and efficient fatigue analysis of helix elements in umbilicals and flexible risers - UmbiliCAD makes an engineer’s produce cross-section drawings and linear cross section analysis within hours increasing the precision level in the bidding process as well as in the detailed engineering phase. - Helica performs the non-linear cross section analysis and fatigue analysis faster than other systems without the need for a detailed finite element model. The input for short term fatigue comes from a DeepC time domain analysis (environmental data) while the cross section details comes from UmbiliCAD. Capacity Curve 1200 100% Utilisation 1100 80% Utilisation 1000 900 800 Tension [kN] 700 600 500 400 300 200 100 0.0 0.0 0.04 0.08 0.12 0.16 0.2 0.24 0.28 Curvature [1/m]SesamTM20 August 2011© Det Norske Veritas AS. All rights reserved. 22
  23. 23. HydroD v4.5 – Benefits When sub-modelling techniques are used we have now made the sub-model independent of the compartment – this means that it is now possible to retrieve loads from the compartments even though only parts of the compartment is part of a sub-model. Hydro- dynamic results like RAO’s can be calculated based on user defined reference points in addition to the still water line. Flexibility in user specification of simulating pressure loading in a zone around the mean free surface has also been introduced. And for those who do hydrodynamic analysis of multi bodies it is now possible to define an additional coupled damping matrix for the bodies. Finally, much larger time domain analysis can be carried out since the computational engine supports 64bit application technology.SesamTM20 August 2011© Det Norske Veritas AS. All rights reserved. 23
  24. 24. 1. HydroD – multi-body additional damping  For multi-body analysis in frequency domain it is possible to run up to 15 different bodies. We have made such analysis even more powerful by allowing the user to specify an additional coupled damping matrix for the bodies. Additional damping matrix. This layout shows a 12x12 matrix for 2 bodiesSesamTM20 August 2011© Det Norske Veritas AS. All rights reserved. 24
  25. 25. 2. HydroD – improved compartment load retrieval  Compartment load retrieval independent of sub-model - The definition of acceleration and zero pressure reference points allows that a submodel may be independent of a compartment - In other words, a sub-model may contain partial compartments also for load transfer - Flexibility in modelling compartment model and sub-models Compartments global model Sub-model at node Load retrieval from compartments to sub- modelSesamTM20 August 2011© Det Norske Veritas AS. All rights reserved. 25
  26. 26. 3. HydroD – user defined pressure reduction region  Apply a user defined pressure reduction region on a selected part of the vessel - The the method is only recommended on the part of the vessel which is wall-sided and should thus be controlled by the user - Benefit: User defined in addition to supporting the DNV rules - This option is available for both frequency and time domain analysis User defined wall-sided partSesamTM20 August 2011© Det Norske Veritas AS. All rights reserved. 26
  27. 27. 4. HydroD – user defined reference point Surge  User defined reference point for calculation of results 1.4 - More flexibility as the reference point can be 1.2 used for calculation of hydrodynamic results 1 Amplitude like e.g. motions, forces and RAO’s 0.8 0.6 - Applicable for results from both frequency and 0.4 time domain analysis 0.2 0 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 Period Sway 1.4 1.2 1 Amplitude 0.8 0.6 Two different reference points 0.4 0.2 0 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 PeriodSesamTM20 August 2011© Det Norske Veritas AS. All rights reserved. 27
  28. 28. 5. HydroD – optimum panel definitions  Automatic proposal for the number of panels needed for an optimum analysis - When creating a panel model from a section model - Based on the model dimensions and mesh criteria Different panels proposed for different model dimensionsSesamTM20 August 2011© Det Norske Veritas AS. All rights reserved. 28
  29. 29. Continuing 40 years of successSesamTM20 August 2011© Det Norske Veritas AS. All rights reserved. 29
  30. 30. Safeguarding life, property and the environment www.dnv.comSesamTM20 August 2011© Det Norske Veritas AS. All rights reserved. 30

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