Three-Dimensional Simulations of a Shock-Gas Column Interaction

Romero, Brian; Poroseva, Svetlana V.; Vorobieff, Peter; Reisner, Jon

doi:10.2514/6.2022-1072

Cited by 1 publication

(3 citation statements)

References 15 publications

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“…High-resolution viscous simulations were conducted to model the 3-D interaction between a planar shock and an inclined cylindrical column of heavy gas with an initially diffuse density interface. The overall flow morphology was similar to the inviscid case presented in our previous study (Romero et al 2022). However, the increased resolution allowed for more detailed statistics to be collected.…”

Section: Discussionsupporting

confidence: 67%

“…Wavelengths are well defined and have regular spacing for each column angle between τ = 20 and τ = 25 before additional secondary instabilities begin to appear. See Romero et al (2022) for a detailed description of wavelength measurements and comparisons with experiments.…”

Section: Resultsmentioning

confidence: 99%

“…This may indicate that the simulation resolution is insufficient to resolve the short wavelengths that occur at smaller initial tilt angles and is not necessarily a failing of the proposed wavelength selection mechanism. For detailed comparisons of simulations to experiment, see Romero et al (2021bRomero et al ( , 2022.…”

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Statistical characterization of a shock interacting with an inclined gas column

Romero,

Reisner,

Vorobieff

et al. 2023

J. Fluid Mech.

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We present a statistical characterization of the interaction between a planar shock and a finite-diameter, cylindrical column of dense gas based on three-dimensional, large-eddy simulation results. In the simulation, the column of gas is initially inclined at an angle $\alpha _0$ with respect to the shock plane. Effects of the initial column angle on the mixing characteristics are examined at Mach number 2.0 for column incline angles $1^\circ$ , $5^\circ$ , $10^\circ$ and $30^\circ$ . Mean velocity profiles show that the column angle affects the gas velocity components in the vertical plane, but not in the spanwise direction. The gas undergoes higher initial upward acceleration at larger initial column incline angles. With time, the gas motion tends to become one-dimensional in the streamwise direction. Initially, velocity fluctuations are most intense within the interior of the column, but concentrate near the column leading edge over time. At high wavenumbers $\kappa$ , the turbulent kinetic energy spectra follow a power-law scaling of $\kappa ^{-1}$ . The structure functions of the mass fraction do not clearly demonstrate power-law scaling except at early times for $\alpha _0=30^\circ$ , manifesting overall trends very similar to those observed in earlier experiments. Probability distributions of the mass fraction show independence of the mean and the standard deviation of the mixed gas on $\alpha _0$ . The column angle was also found to have little effect on the mixing efficiency characterized by the molecular mixedness. Velocity components in the streamwise and transverse directions tend towards a bimodal distribution for larger $\alpha _{0}$ .

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Section: Discussionsupporting

confidence: 67%

Section: Resultsmentioning

confidence: 99%