Acceleration Wave, K-condition, and Global Existence in ET6

Tommaso Ruggeri and Masaru Sugiyama
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Tommaso Ruggeri: University of Bologna, Department of Mathematics and Research Center on Applied Mathematics
Masaru Sugiyama: Nagoya Institute of Technology

Chapter Chapter 20 in Classical and Relativistic Rational Extended Thermodynamics of Gases, 2021, pp 439-444 from Springer

Abstract: Abstract We verify the K-condition for the nonlinear ET6 model and show, for any gas, the existence of global smooth solutions provided that initial data are sufficiently small. As an example, in the case of polyatomic gas, we study acceleration waves. We evaluate the Bernoulli equation for the amplitude of the wave. If the initial amplitude of an acceleration wave is sufficiently small compared with the critical amplitude, the acceleration wave exists for all time and decays to zero as time t becomes large. Vice versa, for large initial amplitude, there exists a critical time at which we have the blow up of the solution and the formation of a shock wave. We show the peculiarity of this model, that is, the velocity of a disturbance and the critical time are universal: these are independent of the degrees of freedom D of a constituent molecule.

Date: 2021
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Persistent link: https://EconPapers.repec.org/RePEc:spr:sprchp:978-3-030-59144-1_20

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DOI: 10.1007/978-3-030-59144-1_20

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