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• W2121526800 abstract "We propose a new test method for investigating which macroscopic continuum models, among the many existing models, give the best description of rarefied gas flows over a range of Knudsen numbers. The merits of our method are: no boundary conditions for the continuum models are needed, no coupled governing equations are solved, while the Knudsen layer is still considered. This distinguishes our proposed test method from other existing techniques (such as stability analysis in time and space, computations of sound speed and dispersion, and the shock wave structure problem). Our method relies on accurate, essentially noise-free, solutions of the basic microscopic kinetic equation, e.g. the Boltzmann equation or a kinetic model equation; in this paper, the BGK model and the ES-BGK model equations are considered. Our method is applied to test whether one-dimensional stationary Couette flow is accurately described by the following macroscopic transport models: the Navier–Stokes–Fourier equations, Burnett equations, Grad’s 13 moment equations, and the regularized 13 moment equations (two types: the original, and that based on an order of magnitude approach). The gas molecular model is Maxwellian. For Knudsen numbers in the transition-continuum regime (Kn ⩽ 0.1), we find that the two types of regularized 13 moment equations give similar results to each other, which are better than Grad’s original 13 moment equations, which, in turn, give better results than the Burnett equations. The Navier–Stokes–Fourier equations give the worst results. This is as expected, considering the presumed accuracy of these models. For cases of higher Knudsen numbers, i.e. Kn > 0.1, all macroscopic continuum equations tested fail to describe the flows accurately. We also show that the above conclusions from our tests are general, and independent of the kinetic model used." @default.
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• W2121526800 date "2006-11-01" @default.
• W2121526800 modified "2023-09-23" @default.
• W2121526800 title "Comparing macroscopic continuum models for rarefied gas dynamics: A new test method" @default.
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• W2121526800 doi "https://doi.org/10.1016/j.jcp.2006.03.005" @default.
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