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physics.flu-dyn2003
A Bound on Mixing Efficiency for the Advection-Diffusion Equation
Jean-Luc Thiffeault, Charles R. Doering, John D. Gibbon
An upper bound on the mixing efficiency is derived for a passive scalar under the influence of advection and diffusion with a body source. For a given stirring velocity field, the…
physics.flu-dyn2003
Higher-order Continuum Approximation for Rarefied Gases
Edward A. Spiegel, Jean-Luc Thiffeault
The Hilbert-Chapman-Enskog expansion of the kinetic equations in mean flight times is believed to be asymptotic rather than convergent. It is therefore inadvisable to use lower ord…