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Visualization of finite element data of a multi-phase concrete model

ASTRO@UIBK. Center for Comput - ation and Technology . Visualization of finite element data of a multi-phase concrete model. M. Ritter 1 , M. Aschaber 1 , W. Benger 2 , G. Hofstetter 1 1 University of Innsbruck, Austria 2 Louisiana State University, USA. 10.7.2013, Vienna. Outline

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Visualization of finite element data of a multi-phase concrete model

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  1. ASTRO@UIBK Center for Comput-ation and Technology Visualization of finite element data of a multi-phase concrete model M. Ritter1, M. Aschaber1, W. Benger2, G. Hofstetter1 1 University of Innsbruck, Austria 2 Louisiana State University, USA 10.7.2013, Vienna

  2. Outline • Motivation • Numerical Simulation • Data Modeling • Visualization • Conclusion & Future Work

  3. Motivation • Motivation: Engineering Simulation Tools and Visualization Scientific Visualization Techniques and Research by Neal Stone Gap

  4. Motivation • Motivation: Engineering Simulation Tools and Visualization Scientific Visualization Techniques and Research by Neal Stone

  5. Motivation • Motivation: • Simulation techniques are used more frequently • Produced data sets growing • Data complexity is increasing • Visualization used for data interpretation of results is important.

  6. Numerical Simulation 10.7.2013, Vienna

  7. Numerical Simulation • Aim: • More realistic simulation of drying shrinkage • Application: • Strengthening of a RC structure by adding an overlay New top concrete layer Old concrete structure

  8. Numerical Simulation • Drying shrinkage: • Long term drying process in concrete • Decrease of relative pore humidity • Increase of capillary pressure • Capillary pressure results in volumetric shrinkage drying concrete

  9. Numerical Simulation • Drying Shrinkage: New top concrete layer Old concrete structure Critical region at joint Different internal stresses Drying shrinkage Swelling concrete

  10. Numerical Simulation • Numerical Simulation: • Finite element simulation on multiple grids of concrete specimen • Hexahedral Mesh of 9 x 9 x 13 Cells 100 x 100 x 56 mm

  11. Numerical Simulation • Numerical Simulation: • Finite element simulation on multiple grids of concrete specimen • Hexahedral Mesh of 9 x 9 x 13 Cells Undeformed linear element Deformed quadratic element The element has curved faces

  12. Numerical Simulation

  13. Numerical Simulation • Drying shrinkage • Effective stress: • Hydrostatic pressure of the water on the solid phase:

  14. Data Modeling 10.7.2013, Vienna

  15. Data Modeling

  16. Data Modeling Grid Field

  17. Data Modeling

  18. Data Modeling

  19. Data Modeling • Hierarchical structure:

  20. Data Modeling

  21. Fiber: 0D 1D 3D 6D Data Modeling Base: 3D 2D 1D 0D

  22. Data Modeling • Data at Vertices: (optional) (optional)

  23. Data Modeling • Data at Integration Points: No positions  can be computed

  24. Data Modeling • Sets of Nodes and Sets of Elements: Indices of vertices in named fragments Indices of integration points in named fragments

  25. Data Modeling • Linked groups for alternative data access: • E.g. time frames and time steps in ABAQUS No data stored

  26. Data Modeling FEM - Example HDF5 Based Data format:  independent, free, open, data browser www.hdfgroup.org

  27. Visualization 10.7.2013, Vienna

  28. Visualization Shell VISH Visualization • Visualization framework • Highly modular design • Small Core • Plug-Ins • Mainly developed by Werner Benger • Currently about 8 people are actively contributing • C++, OpenGL • Open Academic License • Runs on Linux, Windows (and MacOS) • http://vish.fiberbundle.net

  29. Visualization

  30. Visualization

  31. Visualization • Colored Cages • Show FE grid • Positive • Negative • Shaded colored surface • Illustrates data at vertices • One scalar field via color-map • One vector field via displacement • Can be combined with other visualization techniques

  32. Visualization • Colored Cages • Integration point data is extrapolated and averaged on demand Extrapolation from integration points Over-scaled deformation Averaged, smoothed

  33. Visualization • Tensor analysis: • Shape factors by [Westin97] • Stress/strain are3x3 symmetric tensors • 3 Eigen-Values: • Shape factors: [BBHKS06]

  34. Visualization • Direct stress tensor visualization: • Ellipsoids representing the shape factors • Tensor Splats [BengerHege04] -> barycentric

  35. Visualization • Direct stress tensor visualization: • Ellipsoids representing the shape factors • Tensor Splats [BengerHege04] Works only for positive Eigenvalues! -> barycentric

  36. Visualization • Direct stress tensor visualization: • Ellipsoids representing the shape factors • Tensor Splats [BengerHege04] Works only for positive Eigenvalues!  Enhancement: Color a splat in blue, when any Eigenvalues is negative -> barycentric [BBHKS06]

  37. Visualization • Drying simulation: • Tensor splats: Biaxial tension Uniaxial tension Pressure region + Multiple stress directions + Tension vs pressure regions

  38. Visualization • Scalar fields by volume rendering: • Texture based volume rendering ( requires resampling on uniform grid  to be improved) • Shows inner structure of data fields • Example: tri-axial compression of a cuboid and Mises in ABAQUS and Misesvia volume rendering

  39. Drying simulation: • After 30 days of drying • Volume rendering of drying shrinkage • Cages show an uplift of the corner and the edges

  40. Dual volume rendering: • One scalar field controls color • Another controls transparency

  41. Conclusion & Future Work 10.7.2013, Vienna

  42. -The END- 10.7.2013, Vienna

  43. Numerical Simulation • Balance equations of the multiphase model Mass of the water w Mass of the steam gw Mass of the dry air ga Mass of the solid phase s Enthalpy of the whole system Impulse of the whole system

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