Unsteady flow with separation behind a shock wave diffracting over curved walls

Law, C.; Muritala, A. O.; Skews, B. W.

doi:10.1007/s00193-013-0486-z

Cited by 10 publications

(10 citation statements)

References 8 publications

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“…This secondary vortex interaction is similar in nature to those reported for classical M s = 1.5 flow over 90 • diffraction corner, see e.g. (Sun and Takayama, 2003;Skews et al, 2012;Law et al, 2014;. The incident shock further gets diffracted in the right corner of the cavity and produces the reflected wave which rebounds back and forth in the cavity section and intensely perturbs the growing primary vortex and the shear layer.…”

Section: General Flow Evolutionsupporting

confidence: 83%

“…However, viscous interactions become significant for shock-boundary layer/boundary layer-shear layer interactions and for long term shock-vortex dynamics. For example, the classical shock diffraction over 90 • sharp corner requires the consideration of no-slip walls in numerical approach to predict the secondary vortex and long-time evolution of flow dynamics (Sun and Takayama, 2003;Skews et al, 2012;Law et al, 2014;.…”

Section: Introductionmentioning

confidence: 99%

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Shock propagation and diffraction through cavity

Chaudhuri

2018

Linköping Electronic Conference Proceedings

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This work presents a numerical analysis of a planar moving shock wave with Mach number M s = 1.3, travelling through a square cavity geometry with rigid boundaries. A high-order artificial viscosity based Discontinuous Spectral Element Method (DSEM) is used for this purpose. The explicit numerical scheme utilizes entropy generation based transport coefficients to solve the conservative form of the viscous compressible fluid flow equations. Numerical prediction of the shock propagation and diffraction is found to be in excellent agreement with the experimental results of the literature. The stable numerical scheme resolves the detail of the complex flow dynamics for varying reference Reynolds number (Re f ). The range of values of the artificial coefficients and the relative contribution of the components of the artificial energy dissipation rate are investigated and compared for different cases. Artificial energy dissipation is less for low Re f . The dilatational dissipation dominates over other components till the incident shock wave resides in the flow domain.

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Section: General Flow Evolutionsupporting

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Shock propagation and diffraction through cavity

Chaudhuri

2018

Linköping Electronic Conference Proceedings

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“…This model looks promising than both the k-ω and k-ε turbulence models especially in the analysis of a separating flow that requires adequate resolution of near wall effect without introducing unnecessary viscous dissipation outside the boundary layer. It has been confirmed accurate and more reliable for adverse pressure gradient flows Law et al (2014).…”

Section: Methodsmentioning

confidence: 79%

A Study of the Complex Flow Features Behind a Diffracted Shock Wave on a Convex Curved Wall

Craig

2015

JAFM

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The complex flow features behind a diffracted shock wave on a convex curved wall is investigated using large scale experimentation complemented by numerical computation. The study aimed at explaining the global flow behavior within the perturbed region behind the diffracted shock wave. Experiments were conducted in a purpose built shock tube that is capable of generating a range of incident shock Mach numbers Mn ≤ 1.6. Analysis of higher Mach number shocks on different wall geometries were carried out using numerical code that has been validated by earlier authors. Many flow features that were only distinct at high Mach numbers are clearly identified at low Mach numbers in the present investigation. The separation point moves upstream at incident shock Mach number Mn = 1.5 but moves downstream at higher Mach numbers and is nearly stationary at Mn = 1.6. At incident shock Mach number 3.0 the movement of the separation point tends to be independent of the wall curvature as the wall radius approaches infinity. The present investigation is important in the design of high speed flow devices and in the estimation of flow resistance on supersonic devices and space vehicles.

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“…Fomin [7] presented an interesting review of the evolution of the shock tube experimental facilities. Unsteady flow-separation behind a diffracting shock wave over curved walls and multi-faceted walls are presented in [8] and [9]. Experimental study of Quinn & Kontis [10] reported measurement of the static pressure for shock diffraction process.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Shock Wave Diffraction

Chaudhuri

Jacobs

Hong

2019

31st International Symposium on Shock Waves 1

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This work reports analysis of complex shockwave diffraction and long-time behavior of shock-vortex dynamics over splitter geometry encountered in both external and internal compressible flows. The simulation resolved the experimental findings of literature and the insight of the flow topology is being presented with the probability density functions (PDFs) of various contributing terms of enstrophy transport equation and the invariants of the velocity gradient tensor. We use an artificial viscosity (AV) based explicit Discontinuous Spectral Element Method (DSEM) based compressible flow solver for this purpose. The numerical scheme utilizes entropy generation based artificial viscosity and thermal conductivity to simulate the conservative form of the governing compressible flow equations. A shock sensor based switch is used to reduce the addition of AV coefficients in rotationdominated regions.This is a post-peer-review, pre-copyedit version of a chapter published in ISSW 2017: 31st International Symposium on Shock Waves.

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Unsteady flow with separation behind a shock wave diffracting over curved walls

Cited by 10 publications

References 8 publications

Shock propagation and diffraction through cavity

Shock propagation and diffraction through cavity

A Study of the Complex Flow Features Behind a Diffracted Shock Wave on a Convex Curved Wall

Numerical Analysis of Shock Wave Diffraction

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