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Erschienen in:
2010 | OriginalPaper | Buchkapitel
Numerical Simulation of Nozzle Flow into High Vacuum Using Kinetic and Continuum Approaches
verfasst von : Martin Grabe, Rolf-D. Boettcher, Stefanos Fasoulas, Klaus Hannemann
Erschienen in: New Results in Numerical and Experimental Fluid Mechanics VII
Verlag: Springer Berlin Heidelberg
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Laminar nitrogen flow expanding through a conical nozzle into high vacuum is numerically reproduced and compared to available experimental data. As the gas density varies quickly by several orders of magnitude, leading to high rarefaction and thermal non-equilibrium, standard (continuum) CFD tools are not sufficient to accurately model the expanding flow. In the work presented here, the efficiency of Navier-Stokes solvers is to be exploited where applicable, supplying the boundary conditions for a kinetic Direct SimulationMonte Carlo (DSMC) solver to handle the domain of rarefaction and non-equilibrium. The hypersonic character of the flow suggests to attempt a pure downstream coupling. The validity of this approach is to be verified.