Shock propagation and diffraction through cavity

Chaudhuri, A.

doi:10.3384/ecp18153111

Cited by 2 publications

(2 citation statements)

References 15 publications

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“…Although inviscid simulations quite accurately predict the shock wave diffraction wave patterns over different geometrical shapes, it is evident that viscous effects are important for resolving long-time behavior of shock-vortex evolution, shock-shear layer and shock-boundary layer interactions [ 35 , 36 , 37 , 38 , 39 , 40 , 41 ]. These issues are also discussed in the recent works [ 42 , 43 ] using high-order DSEM with AV method.…”

Section: Introductionmentioning

confidence: 99%

On Shock Propagation through Double-Bend Ducts by Entropy-Generation-Based Artificial Viscosity Method

Chaudhuri

2019

Entropy

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Shock-wave propagation through obstacles or internal ducts involves complex shock dynamics, shock-wave shear layer interactions and shock-wave boundary layer interactions arising from the associated diffraction phenomenon. This work addresses the applicability and effectiveness of the high-order numerical scheme for such complex viscous compressible flows. An explicit Discontinuous Spectral Element Method (DSEM) equipped with entropy-generation-based artificial viscosity method was used to solve compressible Navier–Stokes system of equations for this purpose. The shock-dynamics and viscous interactions associated with a planar moving shock-wave through a double-bend duct were resolved by two-dimensional numerical simulations. The shock-wave diffraction patterns, the large-scale structures of the shock-wave-turbulence interactions, agree very well with previous experimental findings. For shock-wave Mach number M s = 1.3466 and reference Reynolds number Re f = 10 6 , the predicted pressure signal at the exit section of the duct is in accordance with the literature. The attenuation in terms of overpressure for M s = 1.53 is found to be ≈0.51. Furthermore, the effect of reference Reynolds number is studied to address the importance of viscous interactions. The shock-shear layer and shock-boundary layer dynamics strongly depend on the Re f while the principal shock-wave patterns are generally independent of Re f .

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Section: Introductionmentioning

confidence: 99%

On Shock Propagation through Double-Bend Ducts by Entropy-Generation-Based Artificial Viscosity Method

Chaudhuri

2019

Entropy

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“…High-order scheme based numerical solvers equipped with robust shock capturing capabilities are essential to resolve the shock dynamics as well as the wide range of length/time scales of the turbulence. In this regard, several studies utilized high-order Weighed Essentially Non Oscillatory (WENO) based schemes [11][12][13][14][15][16][17] or Discontinuous spectral element method (DSEM) with artificial viscosity [18][19][20] to address complex flow features associated with shock diffraction, shock propagation, shock focusing, shock obstacle interaction, etc. Unsteady three-dimensional (3D) studies of shock diffraction are not abundant in the literature.…”

Section: Introductionmentioning

confidence: 99%

Turbulent structures of shock-wave diffraction over 90° convex corner

et al. 2019

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The turbulent structures and long-time flow dynamics of shock diffraction over 90 ○ convex corner associated with an incident shock Mach number Ms = 1.5 are investigated by large eddy simulation (LES). The average evolution of the core of the primary vortex is in agreement with the previous two dimensional studies. The Type-N wall shock structure is found to be in excellent agreement with the previous experimental data. The turbulent structures are well resolved and resemble those observed in the experimental findings. Subgrid scale dissipation and subgrid scale activity parameter are quantified to demonstrate the effectiveness of the LES. An analysis based on turbulent-nonturbulent interface reveals that locally incompressible regions exhibit the universal teardrop shape of the joint probability density function of the second and third invariants of the velocity gradient tensor. Stable focus stretching (SFS) structures dominate throughout the evolution in these regions. Stable node/saddle/saddle structures are found to be predominant at the early stage in locally compressed regions, and the flow structures evolve to more SFS structures at later stages. On the other hand, the locally expanded regions show a mostly unstable nature. From the turbulent kinetic energy, we found that the pressure dilatation remains important at the early stage, while turbulent diffusion becomes important at the later stage. Furthermore, the analysis of the resolved vorticity transport equation reveals that the stretching of vorticity due to compressibility and stretching of vorticity due to velocity gradients plays an important role compared to diffusion of vorticity due to viscosity as well as the baroclinic term.

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Shock propagation and diffraction through cavity

Cited by 2 publications

References 15 publications

On Shock Propagation through Double-Bend Ducts by Entropy-Generation-Based Artificial Viscosity Method

On Shock Propagation through Double-Bend Ducts by Entropy-Generation-Based Artificial Viscosity Method

Turbulent structures of shock-wave diffraction over 90° convex corner

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