EU Regional School - Modersitzki Seminar
Prof. Dr. Jan Modersitzki - Mathematical Models for Correspondence Problems in Medical Imaging
I³MS - Auricchio Seminar
Prof. Dr. Ferdinando Auricchio - 3D Printing: Some Experimental and Numerical Investigations
Additive manufacturing (AM) has recently emerged as a disruptive technology able to revolutionize design and production paradigms, paving the way for new and futuristic applications. However, the growing experience that industries, consumers, and research institutions are maturing on AM clearly indicates the need for new and effective design approaches, adapted and optimized for AM technologies. Computational modeling, in particular, may play a key role for a better comprehension of materials and product performances, as a basis for the development of high performance components, more effective production systems, and innovative applications. However, the multi-physic (from mechanical to thermal phenomena) and multi-scale (from local phase-changes and microstructural aspects to the performance of the entire 3d printed component) characteristics of the AM process represent significant challenges. The presentation will try to address some initial attempts in the modeling of additive manufacturing processes as well as some initial experimental campaigns on specific printing technologies.
I³MS - McDoniel Seminar
Dr. William McDoniel - DSMC Simulation of Io's Plumes and Atmosphere
AICES Graduate School, RWTH University Aachen
Jupiter's moon Io is the most volcanically active body in the solar system and its giant SO2 plumes rise hundreds of kilometers above its rarefied atmosphere. These plumes leave huge, asymmetric deposition rings behind on Io's surface and are the ultimate source of surface frost on Io and of material for Jupiter's plasma torus. The direct simulation Monte Carlo method is used to model one of Io's night-side plumes from the surface of the lava lake from which it erupts, up to its umbrella-shaped canopy shock, and back down to Io's surface where it creates an asymmetric deposition ring. Simulations of plumes being bombarded by ions show how the plume/plasma interaction depends on the location of the plume on Io and how plumes play an important role in supplying Jupiter's plasma torus. Simulations of plumes over an entire Io day show how plume material becomes suspended in and displaces the sublimation atmosphere such that models of the plume/atmosphere interaction which assume that the plume and sublimation components of the atmosphere are independent can yield poor estimates for the total volcanic mass flux, surface thermal inertia, and other parameters.
I³MS - Klar Seminar
Prof. Dr. Axel Klar - Mean Field Approaches to Interacting Particles and Fiber Dynamics
The talk will present an application-oriented introduction to mean-field approximations of interacting physical systems. We investigate microscopic particle systems and their mean-field approximations as well as related hydrodynamic and scalar macroscopic models. Numerical methods for these equations based on mesh-free particle methods for fluid-dynamic equations are discussed, as well as asymptotic preserving approaches for the transition between the different equations. Finally, applications to non-woven textile production, granular flow and crowd dynamics are presented.
I³MS - Nam Seminar
Prof. Dr. Jaewook Nam - Computational Analysis for Thin Film Formation Processes
, Sungkyunkwan University, South Korea
When thin-film manufacturing products such as adhesives, magnetic tapes, battery electrode and optical films are required to be produced at high speed yet maintaining a high degree of uniformity, liquid-phase processing method desirable. The continuous liquid coating process is a method of choice for such purpose, which consisted of numerous unit operations. To maintain a high degree of uniformity, one can exploit surface tension of gas/liquid interfaces, when the coating solution is dilute, which means low viscous liquid. However, an excessive amount of solvent needs to be removed to form a solid film. Therefore, the key steps for the coating process are the application step, where relatively low viscous media to form a liquid layer on a moving substrate, and the drying step, where solidification and microstructure formation occur. Current industrial trends require less solvent or water-based solution (due to environmental regulations) and at the same time requires more functional nano- and micro-particles suspended in the coating liquid (becoming complex fluids). Therefore, understanding underlying physics in forming a thin film and its microstructures for the current coating process become more complex than conventional ones. In this respect, computational analyses play a critical role. In our research group, we focus on computational fluid dynamic analyses of film formation flows or called coating flows and thin-film microstructure evaluations using image analyses. In this seminar, finite element method based analyses on slot coating flow inside and outside coating dies, and the nanowire networks analyses inside the transparent conductive film will be discussed.