Effect of bulk viscosity in supersonic flow past spacecraft

Чикиткин, А. В.; Rogov, B. V.; Tirsky, G.A.; Utyuzhnikov, Sergei

doi:10.1016/j.apnum.2014.01.004

Cited by 27 publications

(21 citation statements)

References 13 publications

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“…It is to be noted that the effect on flow variables (physical parameters) in the medium of van der Waals EOS is appreciable for small values of non-idealness parameter (b), while for large values of non-idealness parameter (b), it is very small. Similar trend in the pressure profiles were reported by [5] and density profiles by [5,16].…”

Section: Resultssupporting

confidence: 88%

Similarity Solution of Spherical Shock Waves -Effect of Viscosity

Dunna

Ramu

Dipak

2016

Proyecciones (Antofagasta)

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In this paper we investigated self-similar solutions for Magneto Hydrodynamic shock waves for the equation of state of Mie-Gruneisen type. Solutions are obtained numerically and the effect of viscosity (K) and the non-idealness parameter (d) on the self-similar solutions are studied in detail. The findings confirmed that, the non-idealness parameter and the viscosity parameter have major effect on the shock strength and the flow variables. All discontinuities of the physical parameters are removed by the viscosity and complete flow field depends upon the magnitude of the viscosity. The obtained results are in good agreement with the results obtained by some of the researchers. All the analysis is presented pictorially in this paper.

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Section: Resultssupporting

confidence: 88%

Similarity Solution of Spherical Shock Waves -Effect of Viscosity

Dunna

Ramu

Dipak

2016

Proyecciones (Antofagasta)

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“…Retaining the bulk viscosity in the stress tensor field 21 conclusively solved the problem of insensibly small wave thicknesses that were predicted 22,23 in descriptions limited to shear viscosity. 24 The conjectured increase in wave thickness was qualitatively confirmed in successive atomistic simulations of non-ideal liquids 25,26 and in numerical investigations of rarefied gases, [27][28][29] given that the shock structure is symmetric. 30 Bulk viscous effects have long been considered mere higherorder contributions.…”

Section: Introductionmentioning

confidence: 76%

Bulk viscosity of liquid noble gases

Chatwell

Vrabec

2020

The Journal of Chemical Physics

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An equation of state for the bulk viscosity of liquid noble gases is proposed. On the basis of dedicated equilibrium molecular dynamics simulations, a multi-mode relaxation ansatz is used to obtain precise bulk viscosity data over a wide range of liquid states. From this dataset, the equation of state emerges as a two-parametric power function with both parameters showing a conspicuous saturation behavior over temperature. After passing a temperature threshold, the bulk viscosity is found to vary significantly over density, a behavior that resembles the frequency response of a one pole low-pass filter. The proposed equation of state is in good agreement with available experimental sound attenuation data.

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“…The impact of bulk viscosity effects has been previously analyzed in several situations including shock-hydrogen bubble interactions [3], turbulent flames [8], compressible boundary layers [9], shock-boundary layer interaction [10], and planar shockwave [11]. All these studies confirm that the bulk viscosity effects may be significant.…”

Section: Introductionmentioning

confidence: 78%

On the role of bulk viscosity in compressible reactive shear layer developments

Boukharfane

Ferrer

Mura

et al. 2019

European Journal of Mechanics - B/Fluids

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a b s t r a c tDespite 150 years of research after the reference work of Stokes, it should be acknowledged that some confusion still remains in the literature regarding the importance of bulk viscosity effects in flows of both academic and practical interests. On the one hand, it can be readily shown that the neglection of bulk viscosity (i.e., κ = 0) is strictly exact for mono-atomic gases. The corresponding bulk viscosity effects are also unlikely to alter the flowfield dynamics provided that the ratio of the shear viscosity µ to the bulk viscosity κ remains sufficiently large. On the other hand, for polyatomic gases, the scattered available experimental and numerical data show that it is certainly not zero and actually often far from negligible. Therefore, since the ratio κ/µ can display significant variations and may reach very large values (it can exceed thirty for dihydrogen), it remains unclear to what extent the neglection of κ holds.The purpose of the present study is thus to analyze the mechanisms through which bulk viscosity and associated processes may alter a canonical turbulent flow. In this context, we perform direct numerical simulations (DNS) of spatially-developing compressible non-reactive and reactive hydrogen-air shear layers interacting with an oblique shock wave. The corresponding flowfield is of special interest for various reactive high-speed flow applications, e.g., scramjets. The corresponding computations either neglect the influence of bulk viscosity (κ = 0) or take it into consideration by evaluating its value using the EGlib library. The qualitative inspection of the results obtained for two-dimensional cases in either the presence or the absence of bulk viscosity effects shows that the local and instantaneous structure of the mixing layer may be deeply altered when taking bulk viscosity into account. This contrasts with some mean statistical quantities, e.g., the vorticity thickness growth rate, which do not exhibit any significant sensitivity to the bulk viscosity. Enstrophy, Reynolds stress components, and turbulent kinetic energy (TKE) budgets are then evaluated from three-dimensional reactive simulations. Slight modifications are put into evidence on the energy transfer and dissipation contributions. From the obtained results, one may expect that refined large-eddy simulations (LES) may be rather sensitive to the consideration of bulk viscosity, while Reynolds-averaged Navier-Stokes (RANS) simulations, which are based on statistical averages, are not. (A. Mura). structure of the fluid as well as the flowfield conditions. However, acoustic absorption measurements performed at room temperature have shown that the ratio of the volume to the shear viscosity κ/µ may be up to thirty for hydrogen at room temperature [2], and recent analyses of reactive multicomponent high-speed flows have confirmed that it is not justified to neglect it, except for the sake of simplicity [3]. The dilatational viscosity is important in describing sound attenuation in gaseous media, and the absorption o...

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Effect of bulk viscosity in supersonic flow past spacecraft

Cited by 27 publications

References 13 publications

Similarity Solution of Spherical Shock Waves -Effect of Viscosity

Similarity Solution of Spherical Shock Waves -Effect of Viscosity

Bulk viscosity of liquid noble gases

On the role of bulk viscosity in compressible reactive shear layer developments

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