Moment Boundary Conditions in Rarefied Gas Slip-Flow Problems

Authors: Latyshev A.V.; Yushkanov A.A.

Source: Fluid Dynamics, Volume 39, Number 2, March 2004 , pp. 339-353(15)

Publisher: Springer

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Abstract:

Two novel models of boundary conditions: diffusive-moment and reflective-moment, generalizing the well-known Cercignani boundary conditions, are proposed. The models take into account the possibility of the different moments of the distribution function being accommodated in different ways and independently of each other. This is impossible in both Maxwell's reflective-diffusive model and the Cercignani model. It is shown that both models approximate Maxwell's reflective-diffusive conditions for slip-flow problems correct to 1%.

Keywords: Maxwell condition; Cercignani condition; reflective-diffusive condition; isothermal slip; thermal slip

Document Type: Research article

DOI: http://dx.doi.org/10.1023/B:FLUI.0000030317.95193.59

Publication date: 2004-03-01