SSD - Kollmannsberger Seminar

Location: AICES Seminar Room 115, 1st floor, Schinkelstr. 2, 52062 Aachen

Dr. Stefan Kollmannsberger - Simulation in Additive Manufacturing with Modern Discretizational Techniques

Chair of Computation in Engineer, Technical University of Munich, Germany


The talk will present a general framework for the simulation of (initial) boundary value problems which may be defined on almost any type of geometric model. This framework is the finite cell method, a high order embedded domain method which the presenter has helped to develop in the recent decade.
Geometric models which form the basis of computational mechanics often stem from Computer Aided Design (CAD). Two variants dominate in this setting: Constructive Solid Geometry (CSG) and boundary representation (B-Rep). The usual CAD to computational analysis process requires the generation of boundary conforming meshes. These, in turn, require the geometric models to be valid, i.e. water tight and flawless. To the contrary, industrial models are often flawed such that model healing must be carried out before boundary conforming meshes can be generated. This presentation will demonstrate how such a potentially expensive healing step may be avoided and how it is possible to directly compute on geometrically and topologically flawed models.
Another type of geometric model are voxel models. They usually stem from computed tomography and are omnipresent, for example in medical applications. Yet, for example for the computation of implants, it is advantageous to augment voxel models by B-Rep models using CSG operations. The talk will discuss how computational analysis is possible on these combined models within the presented framework.
For some applications, as for example in the computational analysis of historic structures, neither CAD nor voxel models are available. Moreover, the construction of an accurate, reverse-engineered CAD model is extremely complex and only possible in a very limited number of cases. As a remedy, this talk will present a new paradigm: to use pictures directly as geometric models for computational mechanics.  The talk will close demonstrating the computational analysis of complex-shaped large historic structures from drone images.