Sorting of construction and demolition waste by hyperspectral-imaging

A basic step to achieve a holistic recycling process for Construction and Demolition Waste (C&DW) is a relevant improvement in (automatic) sorting technologies. Hyperspectral- Imaging (HSI) is an outstanding candidate to support the process. Currently the biggest challenges with regard to C&DW detection cover the need of overlapping VIS, NIR and...

The use of automatic differentiation for adjoint CFD codes

Optimisation of aerospace designs uses the linear gradients of the minimised objective functionals with respect to the specified design variables. These gradients can be computed using a linearised version (or the adjoint equivalent) of the CFD code that outputs the original objective functionals. The task of generating linear or adjoint code...

Enabling User-Driven Checkpointing Strategies in Reverse-Mode Automatic Differentiation

This paper presents a new functionality of the Automatic Differentiation (AD) Tool Tapenade. Tapenade generates adjoint codes which are widely used for optimization in CFD. Unfortunately, for large applications the adjoint code demands a great deal of memory, because it needs to store a large set of intermediates values. To cope with that...

Computation of topological sensitivities in fluid dynamics: Cost function versatility

Topology optimization of fluid dynamical systems is still in its infancy, with its first academic realizations dating back to as late as three years ago. In this paper, we present two approaches to fluid dynamic topology optimization that are based on potential flows and adjoint states, respectively. Special emphasis is paid to the computation...