The Effect of Increasing Rarefaction on the Edney Type IV Shock Interaction Problem

White, Craig; Kontis, Konstantinos

doi:10.1007/978-3-319-73180-3_23

Cited by 3 publications

(6 citation statements)

References 11 publications

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“…In the literature, the Edney shock interaction problem has been studied experimentally and computationally with various DSMC codes from different aspects. This study aims to enlarge that of White and Kontis [23], by extending the geometrical matrix while varying the level of rarefaction. Herein, in order to obtain the effect of increasing rarefaction level on shock-shock interactions, the free-stream flow is considered at three different Knudsen numbers.…”

Section: Resultsmentioning

confidence: 99%

“…3 and 4 in Ref. [23], the pressure and heat transfer coefficients from White and Kontis, calculated using dsmcFoam+, are compared with other studies [19,21,22], which have the same case setup. dsmcFoam+ provides reasonable results when compared with those from experiment.…”

Section: Resultsmentioning

confidence: 99%

“…The properties of the variable hard sphere model gas species are given in Table 2 in Ref. [23]. The fully diffuse Maxwellian reflection kernel is used to model the gas-surface interactions.…”

Section: Problem Descriptionmentioning

confidence: 99%

“…The initial Knudsen number selected is 0.0067, which is the same as previous studies [19,[21][22][23]. Figure 3a shows the distribution of the pressure coefficient on the cylinder surface as H is altered between 63 and 57 mm.…”

Section: Pressure Coefficientsmentioning

confidence: 99%

“…White and Kontis [23] also carried out DSMC simulations to examine the effect of rarefaction on shock interaction physics and surface parameters for a type-IV interaction pattern. The study demonstrated that when the rarefaction level is increased by decreasing gas density, but maintaining all other dimensional parameters the same, the location of the peak in heat transfer, pressure, and skin surface friction coefficients move through the upper sonic line, with the magnitudes of the coefficients decreasing.…”

Section: Introductionmentioning

confidence: 99%

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The effect of increasing rarefaction on the formation of Edney shock interaction patterns: type-I to type-VI

2022

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A shock–shock interaction problem can arise in high-speed vehicles where an oblique shock from one part of the body impinges on a bow shock from a different part of the body. The nature of the interaction can change as the vehicle increases in altitude to a more rarefied environment. In this work, the outcomes of a numerical study investigating the formation of Edney shock patterns from type-I to type-VI as a result of shock–shock interactions at different rarefaction levels are presented. The computations are conducted with a direct simulation Monte Carlo solver for a free-stream flow at a Mach number of 10. In shock–shock interaction problems, both geometrical and rarefaction parameters determine what type of Edney pattern is formed. The region on the shock impinged surface that experiences enhanced thermo-mechanical loads increases when the free-stream flow becomes more rarefied, but the peak values decrease. It is known that these shock interactions can have unsteady behavior in the continuum regime; the current work shows that although increasing rarefaction tends to move the flow toward steady behavior, under some conditions the flow remains unsteady. Graphical abstract

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Problem Descriptionmentioning

confidence: 99%

Section: Pressure Coefficientsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The effect of increasing rarefaction on the formation of Edney shock interaction patterns: type-I to type-VI

2022

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Shock/shock interferences in a supersonic rarefied flow: experimental investigation

2021

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Investigation of shock/shock interferences on the aerodynamics of a fragment in the wake of debris in a rarefied regime/at high altitude

Cardona,

Lago

2023

J. Fluid Mech.

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This work presents an experimental investigation focused on the analysis of aerodynamic properties between two interacting spheres in a supersonic rarefied flow. Atmospheric re-entries of space debris, whether natural or man-made, begin at altitude 120 km, and observations of historical re-entries have shown that fragmentation occurs between 90 and 50 km. The resulting fragments interact with each other, altering their own trajectories while traversing the different flow regimes between the free molecular and continuum regimes. This study focuses on the intermediate slip regime, where viscous effects of varying magnitude can influence the nature of the interactions of the shocks and modify them from the already known behaviour in the continuum regime. Specifically, this study examines how two spheres interact with each other upon re-entry into the atmosphere, focusing particularly on the six types of shock/shock interactions identified by Edney. The experiments were performed in the MARHy wind tunnel, in a steady Mach 4 laminar flow with static pressure 2.67 Pa. To highlight the differences between the six types of interferences, a variety of set-ups and devices were used: flow-field visualization, aerodynamic forces (through two diagnoses, aerodynamic balance and the swinging sphere technique) and wall pressure measurements. Results demonstrate the identification of differences according to the type of interference observed, showing in particular the viscous effect of rarefied flows by making a comparison with the continuum regime.

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The Effect of Increasing Rarefaction on the Edney Type IV Shock Interaction Problem

Cited by 3 publications

References 11 publications

The effect of increasing rarefaction on the formation of Edney shock interaction patterns: type-I to type-VI

The effect of increasing rarefaction on the formation of Edney shock interaction patterns: type-I to type-VI

Shock/shock interferences in a supersonic rarefied flow: experimental investigation

Investigation of shock/shock interferences on the aerodynamics of a fragment in the wake of debris in a rarefied regime/at high altitude

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