Existence,uniqueness and positivity of solutions for BGK models for mixtures |
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Authors: | C. Klingenberg M. Pirner |
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Affiliation: | University of Würzburg, Emil-Fischer-Str. 40, 97074 Würzburg, Germany |
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Abstract: | We consider kinetic models for a multi component gas mixture without chemical reactions. In the literature, one can find two types of BGK models in order to describe gas mixtures. One type has a sum of BGK type interaction terms in the relaxation operator, for example the model described by Klingenberg, Pirner and Puppo [20] which contains well-known models of physicists and engineers for example Hamel [16] and Gross and Krook [15] as special cases. The other type contains only one collision term on the right-hand side, for example the well-known model of Andries, Aoki and Perthame [1]. For each of these two models [20] and [1], we prove existence, uniqueness and positivity of solutions in the first part of the paper. In the second part, we use the first model [20] in order to determine an unknown function in the energy exchange of the macroscopic equations for gas mixtures described by Dellacherie [11]. |
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Keywords: | Multi-fluid mixture Kinetic model BGK approximation Existence Uniqueness Positivity |
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