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CORBA-based Integration of Simulation Workflows

CORBA-based Integration of Simulation Workflows. A. Holtz, S. Kolibal, J-V. Peetz, A. Weihermüller, K. Wolf Institute for Algorithms and Scientific Computing (SCAI) GMD- German National Research Center for Information Technology. Overview. Definition of our Problem Area

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CORBA-based Integration of Simulation Workflows

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  1. CORBA-based Integration of Simulation Workflows A. Holtz, S. Kolibal, J-V. Peetz, A. Weihermüller, K. Wolf Institute for Algorithms and Scientific Computing (SCAI) GMD- German National Research Center for Information Technology

  2. Overview • Definition of our Problem Area • Iterative Modifications in Large Engineering Simulations • Object Oriented Data Structures • CORBA and JAVA as Implementation Layer • System Architecture • Going through an Example • Conclusion

  3. www. .de

  4. Iterative Modifications in Large Engineering Simulations • Object Oriented Data Structures • CORBA and JAVA as Implementation Layer • System Architecture • Going through an Example • Conclusion Definition of ourProblem Area

  5. Engineering Departments Design and construction Simulation and optimisation Industrial Branches Automotive Aircraft Mechanical Engineering …... Application Fields

  6. Numerical Simulation Disciplines Structural Analysis Crash Simulation Metal Forming .. Computational Fluid Dynamics Electro-Mechanical ... Simulation Areas

  7. Commercial Tools without Source Code Access CAD Preprocessing, Mesh-Generator Assembly Simulation Optimisation and Postprocessing Visualisation and VR ... Engineering Tools

  8. Variety of proprietary tools Designed for standalone interactive use In binary and with poor programming interfaces Established at end-users sites Lots of non-matching data-formats Syntactically incompatible Semantically loss of information through converting Engineering Data Flow Existing only in the hands & heads of the engineers What is the Problem

  9. Easy exchange of information between tools Overall definition of data organisation Tool independent Based on small units Providing hierarchical organisation schemes Central point of view and control Distributed workflow Easy adaptation of proprietary tools What is our Goal

  10. Definition of our Problem Area • Object Oriented Data Structures • CORBA and JAVA as Implementation Layer • System Architecture • Going through an Example • Conclusion Iterative Modifications inLarge Engineering Simulations

  11. Machine 1 Machine 2 Machine 3 Machine 4 Distributed Working User Tool Network Host Disk

  12. Iterative Modification Car Design by Microsoft

  13. Complexity of Structural Analysis 2 Million Car Design by BMW

  14. 1 Subset for each simulation discipline Data Sets used for 1 Part CAD Construction Definition of Material Numerical Model Loads Boundary Conditions Example: Fuel Tank Simulation Results Optimisation Parameters Visualisation Data

  15. Working with local Parts yesterday today tomorrow

  16. Simulation on Incompatible Meshes

  17. Simulation on Incompatible Meshes

  18. Definition of our Problem Area • Iterative Modifications in Large Engineering Simulations • CORBA and JAVA as Implementation Layer • System Architecture • Going through an Example • Conclusion Object Oriented Data Structures

  19. Object-oriented data organisation Interface specification in CORBA/IDL Direct access to each data item System implemented through CORBA components Easy extensions through modular architecture Adapter-Libraries for CAE-Tools Concepts for Integration of Data

  20. Different interpretations of model quantities e.g. ‘Stress’ in Crash and Metal forming Different material data bases Different views on hierarchies e.g. ‘Parts’ or ‘Configuration Groups’ Different numerical models e.g. element definitions are not compatible Problems

  21. Data organisation does not define any physics Definition of a minimal set of very basic objects Numerical Models: nodes, elements, subsets, .. Element definition: using an element catalogue Material: IDs referring to tool specific data bases Definition of Links between objects definition of different basic link types e.g. loads, weld types, boundary conditions, ... Solution

  22. Assembly Groups, Units and Links Assembly- Group Assembly- Group Link Link Link Assembly- Unit Link Assembly- Unit Assembly- Unit Assembly- Unit Set Model Result Properties Link Stub

  23. Set Set Set Model Model Model Result Result Result Properties Properties Properties Link Stub Link Stub Link Stub Set Set Set Result Result Result Properties Properties Properties Link Stub Link Stub Link Stub Set Set Set Result Result Result Properties Properties Properties Link Stub Link Stub Link Stub Adaptive Models in Assembly Units Assembly- Unit

  24. createAssemblyGroup() initModel() putCoor() putElements() closeModel() initResult() put-NodeResult() putElementResult() closeResult() delete AssemblyGroup() Interface Specification (1)

  25. getAssemblyGroup() getAssemblyUnits () getResultDescriptors () getCoor () getElements () getElementResult () getNodeResult () Interface Specification (2)

  26. Definition of our Problem Area • Iterative Modifications in Large Engineering Simulations • Object Oriented Data Structures • System Architecture • Going through an Example • Conclusion CORBA and JAVAas Implementation Layer

  27. Industrial middleware standard for client-server applications Transparent access to services (like compute services) No essential performance degradation Object oriented interfaces (CORBA-IDL) Why CORBA?

  28. CORBA Schematic View

  29. CORBA-JAVA Interaction

  30. Workflow Management System TENT 1999 first implementation by GMD & DLR Further Development by DLR SISTEC Applications in Aeronautics, Automotive and others http://www.sistec.dlr.de/tent Application Layer

  31. Definition of our Problem Area • Iterative Modifications in Large Engineering Simulations • Object Oriented Data Structures • CORBA and JAVA as Implementation Layer • Going through an Example • Conclusion System Architecture

  32. BrowserGUI BrowserGUI BrowserGUI BrowserGUI CAE Tool CAE Tool CAE Tool CAE Tool Wrapper Wrapper Wrapper Wrapper DataServer AVS Import/Export Import/Export Import/Export Import/Export VTK Reduce … PostProc Data ManagementComponent System Integration Platform: TENT 0.9 Middleware: JAVA 1.2, CORBA

  33. System Services Extended Name Service Factories and Job Management DataServer Central Component acting as data cache Putting data items into the right place File Management writing and reading the actual data to a file Basic Components

  34. Based on I/O Communication Starting tools in batch-mode Co-Processes as CORBA-adapters communication via Files using IPC Direct Adaptation of Tools CORBA-main using the tool as a library Tool main routine calls CORBA library CAE Tool-Wrapper

  35. Proprietary Formats Reading and writing Extracting data Composing input decks from collected informations Temporary Files Additional files for internal use Data Base Persistent data bases (e.g. material definitions) Format Import and Export

  36. InputData Common Data AssemblyUnit $ENTER COMPONENT NAME = Konsole DOFTYPE = DISP MATH $STRUCTURE $COOR 305 1.559560E+03 -4.738740E+02 3.945060E+02 306 1.556520E+03 -4.759290E+02 3.945120E+02 307 1.554500E+03 -4.789900E+02 3.945160E+02 ... $ELEMENT TYPE = QUAD4 545 866 1025 909 855 546 864 910 1025 866 547 1025 1026 908 909 548 910 911 1026 1025 ... $GEODAT SHELL CONT = THICK P1 2.000000E+00 2.000000E+00 2.000000E+00 & 2.000000E+00 P2 2.000000E+00 2.000000E+00 2.000000E+00 & 2.000000E+00 P3 1.500000E+00 1.500000E+00 1.500000E+00 & 1.500000E+00 ... $MATERIAL NAME = M1_8 TYPE = ISO ! $ELASTIC GENERAL INPUT = DATA 2.100000E+05 3.000000E-01 ! $DENSITY GENERAL INPUT = DATA 7.850000E-15 ! $END MATERIAL GeoDatSymbolTable Codespecific Data MaterialSymbolTable Importing Native File Formats

  37. Browsing and Modification of Information Name service Data contents Controlling Tools Setting parameters Starting tools Runtime control and job monitoring Graphical User Interface

  38. Based on simulation results additional post -processing can easily be realised Reduction Algorithms Analysing tools Public Domain Visualiser High End VR ... Additional Postprocessors

  39. Definition of our Problem Area • Iterative Modifications in Large Engineering Simulations • Object Oriented Data Structures • CORBA and JAVA as Implementation Layer • System Architecture • Conclusion Going through an Example

  40. CAD: Geometries in CATIA-native Preprocessing: FE-Modelling with MEDINA Configuration: with Assembler/CrashViewer Simulation: Structural Analysis with PERMAS Visualisation: AVANGO, AVS oder VTK Integration: DataServer and CORBA-Wrappers Tools in the Workflow

  41. DS* DS* DS* DS* Material-Database (ASCII) <*>.matdb CAD Geometry (CATIA Modell) <AssUnit>.model Attributs (ASCII) <AssUnit>.attrib Structural Organi- sation(ASCII) <AssGroup>.struct Linklist Definitions (ASCII) <AssGroup>.linklist Weldpoints, Weldtype IDs, other Linktypes, Loads Boundary Conditions Description of Geometry including internal sets Materialsa and their Properties Material ID, Wall Thickness, Fe-Element Types Hierarchical Organisation of Parts Weldtype-Database (ASCII) <*>.weldtype Elementtypes including physical Properties, max. Distance of Weldsurfaces FEA FE-Modell Assembler Importer n n DataServer Example Dataflow

  42. NameServer

  43. Data-Browser

  44. INDEED

  45. Permas-Control

  46. Reduce

  47. AVS and Virtual Reality

  48. Jobs-Control

  49. Jobs-Control

  50. Codine-Control

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