Fraunhofer Institute for Industrial Mathematics

Spatiotemporal terahertz emission nanoscopy of spintronic photocurrent

Capturing ultrafast spin and charge photocurrents on nanoscopic scales is essential for fundamental research in physics and engineering, as well as for future applications, such as novel spin-orbitronic devices. Accessing the fundamental dynamics driven by changes in electronic e...

CFD investigation of turbulent dissipation rates in peripheral pumps for micromixing

Peripheral pumps are promising micromixing devices due to their intricate internal flow structures and elevated turbulent dissipation rates. This study presents a detailed computational fluid dynamics (CFD) analysis of turbulent dissipation in a peripheral pump, employing transie...

Design of a Multistable Finger Prosthesis with Programmable Metamaterials

Shape change, as well as the ability to hold specific deformation, is a main requirement for finger prostheses. Currently, these functionalities are realized by screwed hinges with latching elements. To avoid the assembly process and increase the sustainability a non-assembly, 3D...

Simulation of Locally Varying Residual Strains in 4D Printing

ABSTRACT Shape memory polymers (SMPs) are a class of materials capable of storing deformation in a programmed shape, which can be recovered when an external trigger, such as temperature, a magnetic field, or similar is applied. In the classical shape memory cycle, programming con...

Assessing the Systematic and Random Error From a Single Snapshot in Stochastic Homogenization of Industrial Scale Composites

ABSTRACT We estimate effective linear elastic properties from a single microstructure image using a sliding‐window subsampling strategy applied to fields obtained by computational micromechanics. The method yields both mean properties and variance estimates without requiring mult...

Damage Transport with Redistribution

This work is concerned with Damage Transport (DT), a framework for continuum damage mechanics that provides softening damage models while ensuring mathematically well-posed boundary value problems. DT was constructed in a two-step process: First, the cross-convex envelope of the...