On the synchronisation of three-dimensional shock layer and laminar separation bubble instabilities in hypersonic flow over a double wedge

Article Mechanics

Linear stability analysis of hypersonic boundary layers computed by a kinetic approach: a semi-infinite flat plate at 4.5 ≤ M∞ ≤ 9

Angelos Klothakis et al.

Summary: Linear stability analysis using DSMC method was performed on boundary layers of nitrogen, argon, and air, showing that perturbations in DSMC profiles are more damped than in the boundary layer.

THEORETICAL AND COMPUTATIONAL FLUID DYNAMICS (2022)

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Article Mechanics

Analytical prediction of low-frequency fluctuations inside a one-dimensional shock

Saurabh S. Sawant et al.

Summary: The study focuses on the low-frequency molecular fluctuations within straight shocks and proposes a linear correlation between the shape of energy probability density functions and characteristic low frequencies of shocks. By deriving noncentral Chi-squared distributions of particle energies inside shocks and analyzing changes in most-probable-speed, the research aims to predict and estimate low-frequency oscillations in shocks for different Mach numbers and input temperatures. This model provides a physics-based approach to boundary conditions in the analysis of laminar-turbulent transition in high-speed flows, offering insights into receptivity and linear stability studies.

THEORETICAL AND COMPUTATIONAL FLUID DYNAMICS (2022)

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Proceedings Paper Mechanics

Linear Instability of Shock-Dominated Laminar Hypersonic Separated Flows

Saurabh S. Sawant et al.

Summary: In this study, the self-excited spanwise homogeneous perturbations in a hypersonic flow system are investigated using the kinetic DSMC method. The growth rates of unstable modes, the wavelength, location, and characteristic frequencies of spanwise periodic flow structures in this interaction are assessed.

IUTAM LAMINAR-TURBULENT TRANSITION (2022)

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Article Mechanics

Unsteady effects in a hypersonic compression ramp flow with laminar separation

Shibin Cao et al.

Summary: Direct numerical simulations are used to study hypersonic flow over a compression ramp, revealing the formation of streamwise heat flux streaks downstream of reattachment that exhibit low-frequency unsteadiness and are non-uniformly distributed in the spanwise direction. The unsteadiness of the heat flux streaks is coupled with a pulsation of the reattachment position, and global instabilities are found to be responsible for the flow unsteadiness.

JOURNAL OF FLUID MECHANICS (2021)

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Article Mechanics

A kinetic approach to studying low-frequency molecular fluctuations in a one-dimensional shock

Saurabh S. Sawant et al.

Summary: Low-frequency molecular fluctuations in the translational nonequilibrium zone of one-dimensional strong shock waves are characterized for the first time within a kinetic collisional framework. The study reveals the bimodal nature of the probability density function in the shock region, suggesting the introduction of a novel two-bin model to describe the reduced-order dynamics of a large number of collision interactions of gas particles with strong correlation between perturbations and fluctuations in the normal stress.

PHYSICS OF FLUIDS (2021)

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Article Mechanics

Occurrence of global instability in hypersonic compression corner flow

Jiaao Hao et al.

Summary: The numerical investigation of hypersonic flow over a two-dimensional compression corner revealed that the shock-induced separated flow system becomes unstable when the ramp angle exceeds a certain value, with global instability closely linked to the occurrence of secondary separation beneath the primary separation bubble.

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Modal analysis with proper orthogonal decomposition of hypersonic separated flows over a double wedge

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Hypersonic compression corner flow with large separated regions

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Reattachment streaks in hypersonic compression ramp flow: an input-output analysis

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Application of adaptively refined unstructured grids in DSMC to shock wave simulations

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Investigation of unsteady, hypersonic, laminar separated flows over a double cone geometry using a kinetic approach

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Simulation and stability analysis of oblique shock-wave/boundary-layer interactions at Mach 5.92

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Onset of three-dimensionality in supersonic flow over a slender double wedge

G. S. Sidharth et al.

PHYSICAL REVIEW FLUIDS (2018)

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On the unsteadiness of shock-laminar boundary layer interactions of hypersonic flows over a double cone

Ozgur Tumuklu et al.

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Stability and modal analysis of shock/boundary layer interactions

Joseph W. Nichols et al.

THEORETICAL AND COMPUTATIONAL FLUID DYNAMICS (2017)

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Instability and low-frequency unsteadiness in a shock-induced laminar separation bubble

Andrea Sansica et al.

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Parallel data-driven decomposition algorithm for large-scale datasets: with application to transitional boundary layers

Taraneh Sayadi et al.

THEORETICAL AND COMPUTATIONAL FLUID DYNAMICS (2016)

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Proper orthogonal decomposition of atomistic flow simulations

L. Grinberg

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Low-frequency unsteadiness in shock wave-turbulent boundary layer interaction

Stephan Priebe et al.

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A simple model for low-frequency unsteadiness in shock-induced separation

S. Piponniau et al.

JOURNAL OF FLUID MECHANICS (2009)

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Large-eddy simulation of low-frequency unsteadiness in a turbulent shock-induced separation bubble

Emile Touber et al.

THEORETICAL AND COMPUTATIONAL FLUID DYNAMICS (2009)

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Bifurcations in shock-wave/laminar-boundary-layer interaction: global instability approach

J.-Ch. Robinet

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3D steady and unsteady bifurcations in a shock-wave/laminar boundary layer interaction: A numerical study

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THEORETICAL AND COMPUTATIONAL FLUID DYNAMICS (2006)

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Direct numerical simulation of impinging shock wave/turbulent boundary layer interaction at M=2.25

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Unsteadiness in shock wave boundary layer interactions with separation

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AEROSPACE SCIENCE AND TECHNOLOGY (2006)

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Numerical simulation of Gortler vortices in hypersonic compression ramps

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Instabilities in supersonic compression ramp flow

AJP Fletcher et al.

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Statistical error in particle simulations of hydrodynamic phenomena

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Vibrational relaxation rates in the direct simulation Monte Carlo method

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Once again on the supersonic flow separation near a corner

GL Korolev et al.

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On the origins of unsteadiness and three-dimensionality in a laminar separation bubble

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PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES (2000)

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On the synchronisation of three-dimensional shock layer and laminar separation bubble instabilities in hypersonic flow over a double wedge

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