Fraunhofer SCAI SimCompare

In 2021 CDH AG acquired marketing, sales and support rights from scapos AG to distribute the tool SimCompare in Japan and USA.

SimCompare is a tool for detecting events – in this context deviations, such as anomalies or strange variations in deformations – arising in the results of similar simulation runs for crashworthiness analysis using finite element (FE) models. It provides a comparison of two FE simulation results based on arbitrary node / element data functions, e.g. displacements, plastic strains, or thicknesses, and time step. The parts with the largest differences are automatically highlighted based on several comparison measures and an appropriate threshold.

The SimCompare developers at Fraunhofer SCAI combine mathematics and machine learning to integrate existing application knowledge in data analysis methods. This enables us to provide SimCompare as an important step towards automatic event detection in an overall simulation data analysis workflow. Our tool allows to systematically analyze a design tree and to detect deviations caused by design changes. SimCompare can be used hand-inhand with the SCAI tool ModelCompare for the identification of design measures realized through model adaptation.

Automatic event detection

In computer-aided engineering (CAE) numerous design changes are applied within the overall design development process until the final model satisfies all design criteria. Each of the design changes has to be analyzed and its influences on the simulation results have to be compared and evaluated. SimCompare is a tool to easily analyze the impact of design changes in terms of data functions.
SimCompare automatically highlights the most relevant parts together with local hotspots with respect to design changes. Thus, users are provided insight starting with only two simulations, without the burden of manually determining the differences or the necessity of setting up a simulation data base. To document the influences of design changes, a report can be generated which is automatically adjusted for each analysis setup.

User Benefit

  • A seamless interface as a plug-in:
    Available as a plug-in for GNS Animator or as stand-alone batch tool. Results are visualized directly within Animator.
  • Comparison based on node and element data functions:
    Arbitrary node or element data functions available in the simulation models (e.g. signed plastic strains, displacements) can be selected for comparison via the plug-in GUI or by a settings file.
  • Filtering of the most influenced parts:
    Filtering of the most affected parts is supported interactively and automatically enabled in order to systematically detect influences of design changes
  • Several metrics for different purposes:
    Several comparison measures (metrics) are available to focus on global or local influences
  • Visualization of local events:
    Deviations are visualized on both models, node- and elementwise. This simplifies the detection of local hotspots
  • Automatic report generation:
    Automatic pdf report generation makes it easy to archive analysis results. Additionally, all differences are stored node-/elementwise for loading in the preprocessor tool.
Christian Pieper


Christian Pieper//
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