What is it about?
Development of a new technique to generate generalized fluid equations consistent with the kinetic theory of gases and without the requirement to introduce empirical ad hoc transport coefficients in order to approximate kinetic effects.
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Why is it important?
This research is unique since it is based on an analytic non-orthogonal basis set in order to significantly reduce the number of requirement fluid moments, and thanks to the simplest generalized fluid model we discover the origin of the particle diffusion and heat conduction: it relies on the existence of a non-thermalized distribution function on shorter time scales than the time scale of the thermalization of the distribution function due to collisions. Moreover, we show that the usual ad hoc diffusion and conduction transport coefficients describe only the linearized limit of the real phenomena described above.
Perspectives
This article motivates the interest of developing the next generation of fluid codes including kinetic effects and avoiding the use of empirical ad hoc transport coefficients. This would significantly improve the numerical accuracy between fluid and kinetic (particle) simulations.
Dr Olivier Izacard
Lawrence Livermore National Laboratory
Read the Original
This page is a summary of: Generalized fluid theory including non-Maxwellian kinetic effects, Journal of Plasma Physics, March 2017, Cambridge University Press,
DOI: 10.1017/s0022377817000150.
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