A Geometrical Method for Low-Dimensional Representations of Simulations

We present a data analysis approach where simulations of an industrial product are contained in the space of surface meshes embedded in R^3. In this setting, a discrete Laplace-Beltrami operator can be constructed on the mesh, which is invariant to isometric transformations and therefore valid for all simulations. The eigenfunctions of such an operator are used as a common basis for all (isometric) simulations and one can use the projection coefficients instead of the full simulations for further analysis.

The data analysis approach is applied to time dependent datasets from numerical car crash simulations. One observes that only a few spectral coefficients are necessary to describe the data variability and low dimensional structures are obtained. The eigenvectors are seen to recover different independent variation modes such as translation, rotation, or global and local deformations. An effective analysis of the data from bundles of numerical simulations is made possible, in particular an analysis for many simulations in time.