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Direct numerical simulation of supersonic turbulent boundary layer subjected to a curved compression ramp
Tong FL(童福林); Li XL(李新亮); Duan YH; Yu ZP(于长平)
Source PublicationPHYSICS OF FLUIDS

Numerical investigations on a supersonic turbulent boundary layer over a longitudinal curved compression ramp are conducted using direct numerical simulation for a free stream Mach number M-infinity = 2.9 and Reynolds number Re-theta = 2300. The total turning angle is 24 degrees, and the concave curvature radius is 15 times the thickness of the incoming turbulent boundary layer. Under the selected conditions, the shock foot is transferred to a fan of the compression wave because of the weaker adverse pressure gradient. The time-averaged flow-field in the curved ramp is statistically attached where the instantaneous flow-field is close to the intermittent transitory detachment state. Studies on coherent vortex structures have shown that large-scale vortex packets are enhanced significantly when the concave curvature is aligned in the spanwise direction. Consistent with findings of previous experiments, the effect of the concave curvature on the logarithmic region of the mean velocity profiles is found to be small. The intensity of the turbulent fluctuations is amplified across the curved ramp. Based on the analysis of the Reynolds stress anisotropy tensor, the evolutions of the turbulence state in the inner and outer layers of the boundary layer are considerably different. The curvature effect on the transport mechanism of the turbulent kinetic energy is studied using the balance analysis of the contributing terms in the transport equation. Furthermore, the Gortler instability in the curved ramp is quantitatively analyzed using a stability criterion. The instantaneous streamwise vorticity confirms the existence of the Gortler-like structures. These structures are characterized by an unsteady motion. In addition, the dynamic mode decomposition analysis of the instantaneous flow field at the spanwise/wall-normal plane reveals that four dynamical relevant modes with performance loss of 16% provide an optimal low-order representation of the essential characteristics of the numerical data. The spatial structures of the dominated low-frequency dynamic modes are found to be similar to that of the Gortler-like vortices. Published by AIP Publishing.

Indexed BySCI ; EI
WOS IDWOS:000418958300046
WOS KeywordConcave Surface Curvature ; Adverse Pressure-gradient ; Large-eddy Simulation ; Reynolds-number ; Near-wall ; Flows ; Separation ; Vortices ; Models
WOS Research AreaMechanics ; Physics
WOS SubjectMechanics ; Physics, Fluids & Plasmas
Funding OrganizationNational Key Research and Development Program of China(2016YFA0401200) ; National Natural Science Foundation of China(91441103 ; 11372330 ; 11472278)
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Cited Times:11[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
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GB/T 7714
Tong FL,Li XL,Duan YH,et al. Direct numerical simulation of supersonic turbulent boundary layer subjected to a curved compression ramp[J]. PHYSICS OF FLUIDS,2017,29(12):125101.
APA 童福林,李新亮,Duan YH,&于长平.(2017).Direct numerical simulation of supersonic turbulent boundary layer subjected to a curved compression ramp.PHYSICS OF FLUIDS,29(12),125101.
MLA 童福林,et al."Direct numerical simulation of supersonic turbulent boundary layer subjected to a curved compression ramp".PHYSICS OF FLUIDS 29.12(2017):125101.
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