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VA: Fachverband Vakuumphysik und Vakuumtechnik
VA 1: Rarefied gas flows and novel approaches for particle simulation
VA 1.3: Vortrag
Montag, 16. März 2020, 10:50–11:10, HSZ 301
Stochastic Simulation of Mercury Diffusion Pumps Using Direct Simulation Monte Carlo — •Tim Teichmann and Thomas Giegerich — Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen
Currently, a continuously working pump train for DEMO (the European demonstration fusion power plant) is under active development. Mercury driven diffusion pumps have been chosen as possible candidates for the high vacuum pumping of the exhaust gases. In order to design and optimize diffusion pumps for DEMO, a reliable numerical simulation method is required.
The numerical simulation of the DEMO diffusion pumps is a complex challenge as the gas flow in the pump spans a wide Knudsen number range. Typical inlet pressures of the diffusion pumps for DEMO are expected to be in the order of 10−3 Pa during dwell and up to 1 Pa during burn respectively. This is equivalent to estimated Knudsen numbers in the range of 10 to 0.01. As the Navier-Stokes equations lose their validity at Kn > 0.1, classic continuum solvers cannot be applied to the problem at hand. Therefore, the Boltzmann equation has to be solved to describe this flow regime. In this case the Direct Simulation Monte Carlo (DSMC) method was chosen to solve the Boltzmann equation.
The application of DSMC for simulating the DEMO diffusion pumps will be discussed. Additionally, an outlook on possible hybrid simulation techniques will be given.