Temperature Overshoot in Shock Waves

Yen, S. M.

doi:10.1063/1.1761862

Cited by 45 publications

(23 citation statements)

References 2 publications

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“…It is due to the finite coupling rates between the translational degrees of freedom (and also due to finite-rate translational-rotational mode coupling in the case of nitrogen). The overshoot for the argon case is surprisingly close to the value predicted for a shock of the same Mach number in a dilute fluid (23.6%) [7]. There is no observable overshoot of the overall temperature.…”

Section: Discussionsupporting

confidence: 56%

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Higher moments of the velocity distribution function in dense-gas shocks

Schlamp

Hathorn

2007

Journal of Computational Physics

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Large-scale molecular dynamics simulations of a M s = 4.3 shock in dense argon (ρ = 532 kg/m 3 , T = 300 K) and a M s = 3.6 shock in dense nitrogen (ρ = 371 kg/m 3 , T = 300 K) have been performed. Results for moments (up to order 10) of the velocity distribution function are shown. The excess even moments of the shock-normal velocity component (i.e., in the direction of shock propagation) are positive for most parts of the shock wave, but become negative towards the hot side of the shock before reverting back to zero. The even excess moments of the shock-parallel velocities and the odd moments of the shock-normal velocity do not change signs within the shock. The magnitude of the excess moments increases with the order of the moment, i.e., the higher moments correspond less and less to those of a Maxwell-Boltzmann distribution.

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Section: Discussionsupporting

confidence: 56%

“…These works focus on the steady-state profile. They reproduce the overshoot of the translational temperature perpendicular to the plane of the shock wave, which has been predicted by Yen [7]. Holway [8] and Salwen at al.…”

Section: Scope and Itinerarysupporting

confidence: 53%

Higher moments of the velocity distribution function in dense-gas shocks

Schlamp

Hathorn

2007

Journal of Computational Physics

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“…An important feature of the shock front structure is the strong "overshoot" 43 , i.e., a high peak, of ion temperature and its components near the shock front, which is much weaker in the classical MD simulations 10,16,17 . Fig.…”

Section: A Structure Of Shock Frontsmentioning

confidence: 99%

Molecular dynamics simulation of strong shock waves propagating in dense deuterium, taking into consideration effects of excited electrons

et al. 2017

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We present a molecular dynamics simulation of shock waves propagating in dense deuterium with the electron force field method [J. T. Su and W. A. Goddard, Phys. Rev. Lett. 99, 185003 (2007)], which explicitly takes the excitation of electrons into consideration. Non-equilibrium features associated with the excitation of electrons are systematically investigated. We show that chemical bonds in D 2 molecules lead to a more complicated shock wave structure near the shock front, compared with the results of classical molecular dynamics simulation. Charge separation can bring about accumulation of net charges on the large scale, instead of the formation of a localized dipole layer, which might cause extra energy for the shock wave to propagate. In addition, the simulations also display that molecular dissociation at the shock front is the major factor corresponding to the "bump" structure in the principal Hugoniot. These results could help to build a more realistic picture of shock wave propagation in fuel materials commonly used in the inertial confinement fusion.

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“…Note in particular the well-known temperature overshoot of the shock-normal temperature component, whose magnitude depends on the Mach number and the ratio of specific heats. This overshoot was first predicted theoretically [25,26], but later confirmed experimentally (Ref. [27] is a more recent example).…”

Section: Macroscopic Shock Structurementioning

confidence: 94%

Atomistic phenomena in dense fluid shock waves

Schlamp

Hathorn

2008

Shock Waves

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The shock structure problem is one of the classical problems of fluid mechanics and at least for non-reacting dilute gases it has been considered essentially solved. Here we present a few recent findings, to show that this is not the case. There are still new physical effects to be discovered provided that the numerical technique is general enough to not rule them out a priori. While the results have been obtained for dense fluids, some of the effects might also be observable for shocks in dilute gases.

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Temperature Overshoot in Shock Waves

Abstract: Temperature associated with the logitudinal thermal velocities overshoots for M1 > (9/5)½ for monatomic gases. The overshoot and the location of the maximum temperature are functions of M1.

Cited by 45 publications

References 2 publications

Higher moments of the velocity distribution function in dense-gas shocks

Higher moments of the velocity distribution function in dense-gas shocks

Molecular dynamics simulation of strong shock waves propagating in dense deuterium, taking into consideration effects of excited electrons

Atomistic phenomena in dense fluid shock waves

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Temperature Overshoot in Shock Waves

Abstract: Temperature associated with the logitudinal thermal velocities overshoots for M1 &gt; (9/5)½ for monatomic gases. The overshoot and the location of the maximum temperature are functions of M1.

Cited by 45 publications

References 2 publications

Higher moments of the velocity distribution function in dense-gas shocks

Higher moments of the velocity distribution function in dense-gas shocks

Molecular dynamics simulation of strong shock waves propagating in dense deuterium, taking into consideration effects of excited electrons

Atomistic phenomena in dense fluid shock waves

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Product

Resources

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Abstract: Temperature associated with the logitudinal thermal velocities overshoots for M1 > (9/5)½ for monatomic gases. The overshoot and the location of the maximum temperature are functions of M1.