Dresden 2020 – wissenschaftliches Programm

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VA: Fachverband Vakuumphysik und Vakuumtechnik

VA 1: Rarefied gas flows and novel approaches for particle simulation

VA 1.2: Vortrag

Montag, 16. März 2020, 10:10–10:30, HSZ 301

Deterministic modeling of neutral gas flows in tokamak nuclear fusion devices — •Christos Tantos, Stylianos Varoutis, and Christian Day — Karlsruhe Institute of Technology, Institute for Technical Physics, Karlsruhe, Germany

Over the last few years much effort has been invested in modeling the complex geometry of the divertor region in tokamak fusion devices. Depending on the upstream plasma conditions, the flow reference Knudsen number, defined as the ratio of the mean free path over a characteristic length, may vary over a wide range. The rarefied flow behavior in these systems cannot be properly captured by the typical Navier-Stokes-Fourier approach and must be described by the integro-differential Boltzmann equation or reliable kinetic model equations. The Discrete Velocity Method (DVM) has been developed into one of the most common techniques for solving the Boltzmann equation and the kinetic models. As it is well known simulating multidimensional rarefied gas problems based on the Boltzmann equation is computationally time consuming. Therefore, successful implementation of reliable kinetic models in such problems is important. In the present work the well-established Shakhov kinetic model supplemented by the DVM method is applied to predict the behavior of the neutral gas flow in the divertor region. Results are presented for He and D2 covering a wide range of the involved parameters. Several comparisons between the present deterministic modeling and the stochastic Direct Simulation Monte Carlo are shown and discussed.