Unsteadiness of the shock wave structure in attached and separated compression ramp flows

Dolling, D. S.; Or, C. T.

doi:10.1007/bf00285267

Cited by 176 publications

(108 citation statements)

References 15 publications

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“…They found amplifications of turbulence intensity U 2 the structure parameter -uul 2 /u 1 , and the temperature fluctuation inside the boundary layer. Dolling and Or [1985] measured wall pressure fluctuations upstream of the corner in flows with M U = 3.0 over compression ramps with corner angles of 80 , 120 , 160, and 200. They found that the shock wave structure is unsteady in both separated and attached downstream flows, resulting in a region in which the wall pressure signal is intermittent.…”

Section: Methodsmentioning

confidence: 99%

Interaction of Isotropic Turbulence with a Shock Wave

Lee¹,

Moin²,

Lele³

1992

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ord (,J iifnor 1 ca" l.0.i - 92-13271REPORT DOCUMENTATION PAGE As a first step to understand the compressibility effects, interaction of isotropic quasi-incompressible turbulence with a weak shock wave was studied by threedimensional time-dependent direct numerical simulations. In addition, linear analysis was used to study interaction of isotropic turbulence with shock waves of a wide range of strengths. The effects of the fluctuation Mach number Aft and the average Mach number A'f of the upstream turbulence on turbulence statistics were investigated.Both numerical simulations and linear analyses of the interaction show that turbulence is enhanced during the interaction with a shock wave. ABSTRACTAs a first step to understand the compressibility effects, interaction of isotropic quasi-incompressible turbulence with a weak shock wave was studied by threedimensional time-dependent direct numerical simulations. In addition, linear analysis was used to study interaction of isotropic turbulence with shock waves of a wide range of strengths. The effects of the fluctuation Mach number M and the average Mach number M17 of the upstream turbulence on turbulence statistics were investigated.Both numerical simulations and linear analyses of the interaction show that turbulence is enhanced during the interaction with a shock wave. Turbulent kinetic energy (TKE) and transverse vorticity components are amplified, and turbulent length scales are decreased. The predictions of the linear analyses compare favorably with simulation results for flows with M < M~r -1, which suggests that the amplification mechanism is mainly linear.Rapid evolution of TKE just downstream of the shock was not, however, reproduced by the linear analysi-Investigation of the budget of the TKE transport equation shows that this beiiavior of TKE is manifested in the pressure transport term (pf" ' 1 ) ,i , which is nonlinear. The budgets of enstrophy components W' 2 show that their amplifications through the shock are mainly caused by the distortion due to the mean flow compression, and that effect of baroclinic torque is not significant. Shock waves were found to be distorted by the upstream turbulence, but still have a well-defined shock front for Mt < M17 -1. In this regime, the statistics of the displacement and inclination of the shock front compare favorably with the linear analysis predictions. For flows with M1 > M(T -1, shock waves no longer have well-defined fronts. shock wave thickness and strength vary widely in the transverse directions. Multiple peaks in pressure are found along the mean streamline where the local thickness of the shock wave has increased significantly. iv AcknowledgementsThe authors would like to acknowledge the financial support from the Air Force

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Section: Methodsmentioning

confidence: 99%

Interaction of Isotropic Turbulence with a Shock Wave

Lee¹,

Moin²,

Lele³

1992

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“…The unsteadiness of the shock system in the compression corner has been studied in detail by Dolling and Murphy [49] and Dolling and Or [50] who observed separation shock motion on the scale of δ at frequencies more than an order of magnitude below the frequency U ∞ /δ of the energy containing eddies of the incoming boundary layer. Andreopoulos and Muck [51] observed that the frequency of the separation shock unsteadiness is approximately the same as the bursting frequency of the upstream boundary layer.…”

Section: Advances In Cfd Prediction Of Shock Wave Turbulent Boundary mentioning

confidence: 99%

Advances in CFD prediction of shock wave turbulent boundary layer interactions

Knight

Yan

Panaras³

et al. 2003

Progress in Aerospace Sciences

254

114

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“…There are two different characteristic frequencies of the shock oscillation, and the time scale of the high-frequency oscillation is O(δ/U ∞ ), while the time scale of the low-frequency one is O(10δ/U ∞ − 100δ/U ∞ ) [4]. Ganapathisubramani et al [5] have found that there are clusters of coherent structures (so-called "super-structures") in the turbulent boundary layer and deemed that the clusters of coherent structures play an important role in the low-frequency oscillation of the shock.…”

Section: Preliminary Investigation Of the Mechanism For Shock Oscillamentioning

confidence: 99%

DNS of Shock/Boundary Layer Interaction Flow in a Supersonic Compression Ramp

Li¹,

Fu²,

Ma³

et al. 2011

Computational Fluid Dynamics 2010

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A direct numerical simulation of the shock/turbulent boundary layer interaction flow in a supersonic 24-degree compression ramp is conducted with the free stream Mach number 2.9. The blow-and-suction disturbance in the upstream wall boundary is used to trigger the transition. Both the mean wall pressure and the velocity profiles agree with those of the experimental data, which validates the simulation. The turbulent kinetic energy budget in the separation region is analyzed. Results show that the turbulent production term increases fast in the separation region, while the turbulent dissipation term reaches its peak in the near-wall region. The turbulent transport term contributes to the balance of the turbulent conduction and turbulent dissipation. Based on the analysis of instantaneous pressure in the downstream region of the mean shock and that in the separation bubble, the authors suggest that the low frequency oscillation of the shock is not caused by the upstream turbulent disturbance, but rather the instability of separation bubble.

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Unsteadiness of the shock wave structure in attached and separated compression ramp flows

Cited by 176 publications

References 15 publications

Interaction of Isotropic Turbulence with a Shock Wave

Interaction of Isotropic Turbulence with a Shock Wave

Advances in CFD prediction of shock wave turbulent boundary layer interactions

DNS of Shock/Boundary Layer Interaction Flow in a Supersonic Compression Ramp

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