Regensburg 2025 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 66: Vacuum Science Technology: Theory and Applications

O 66.1: Hauptvortrag

Mittwoch, 19. März 2025, 15:00–15:30, H8

Unveiling the crucial role of kinetic modeling of gas flows in vacuum and fusion technologies — •Christos Tantos and Thomas Giegerich — Institute for Technical Physics, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, 76344, Germany

Accurate and reliable modeling of non-equilibrium flows is not only of academic interest within the scientific community, including the field of vacuum gas dynamics, but is also crucial for the design and enhancement of engineering processes, such as those in vacuum and fusion technologies. In these applications, the flow is characterized by molecular mean free paths that are comparable to the reference characteristic length, making a particle-based description of the flow field essential. This requires the use of the Boltzmann equation and widely accepted numerical methods for solving it, such as the stochastic Direct Simulation Monte Carlo (DSMC) and the deterministic Discrete Velocity Method (DVM).

This talk discusses key aspects of rarefied gas dynamics in vacuum and fusion technologies, emphasizing the link between theory and practice. It is divided into two parts. The first covers recent advances in modeling multicomponent transport phenomena in vacuum technology using DSMC and DVM methods, with a focus on gas separation in multicomponent flows. The second part analyzes vacuum gas dynamics in fusion systems, presenting numerical simulations (2D and 3D) of pumping systems in fusion machines and highlighting their design impact.