Investigation of Three-Dimensional Shock Wave/Turbulent-Boundary-Layer Interaction Initiated by a Single Fin

Fang, Jiaojiao; Yao, Yufeng; Zheltovodov, A. A.; Lu, Lipeng

doi:10.2514/1.j055283

Cited by 51 publications

(10 citation statements)

References 64 publications

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“…The convection terms are solved with a seventh-order low-dissipative monotonicity-preserving (MP7-LD) scheme (Fang, Li & Lu 2013;Fang et al 2014), which can resolve small-scale turbulent structures as effectively as high-order central schemes, whilst preserving monotonicity near shock waves. This approach has been recently applied to studies of various SWTBLI problems (see Fang et al 2014Fang et al , 2015Fang et al , 2017. The diffusion terms are solved using a sixth-order compact central scheme (Hirsh 1975;Lele 1992) with a domain decoupling scheme for parallel computation (Fang et al 2019).…”

Section: Computational Set-upmentioning

confidence: 99%

On the turbulence amplification in shock-wave/turbulent boundary layer interaction

et al. 2020

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Section: Computational Set-upmentioning

confidence: 99%

On the turbulence amplification in shock-wave/turbulent boundary layer interaction

et al. 2020

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“…Similarity is exhibited by the lambda shock structure in both configurations, with the rear shock being stronger than the separation shock. Density fluctuations associated with the slip line, which proceeds downstream from the junction of the separation, rear, and main shocks, are less intense than those observed at higher Mach number [63]. Across the slip line, pressure and velocity direction are continuous, whereas density and velocity magnitude are not.…”

Section: B Fundamental Flow Featuresmentioning

confidence: 82%

“…No secondary separation is observed in any of the interactions of the present work. However, such a phenomenon is discussed for higher-Mach-number 3-D STBLIs [20,63]. The onset of secondary separation is often described as gradual with respect to radial displacement from the VCO, having a rather indistinct secondary reattachment line [17,18,68]: this description is more consistent with that of secondary crossflow separation than secondary type 1 (classical) separation, as categorically described by Chapman and Yates [64].…”

Section: Open Primary Separationmentioning

confidence: 97%

Flow Similarity in Strong Swept-Shock/Turbulent-Boundary-Layer Interactions

Adler

Gaitonde

2019

AIAA Journal

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The separation length employed to scale unsteady phenomena in strong (separated) nominally two-dimensional (2-D) shock/turbulent-boundary-layer interactions cannot be directly extended to three-dimensional (3-D) swept interactions, due to the quasi-conical symmetry of 3-D interactions. This paper examines the issue by considering large-eddy simulations of Mach 2 canonical flows arising from plate-mounted swept compression ramps and sharp fins at various interaction strengths, which have been the subject of concurrent experimental campaigns. Several key structural features are discussed that distinguish 3-D interactions from 2-D interactions in the context of free-interaction principles and quasi-conical symmetry, including their relationship to strong crossflow and open separation. The virtual-conical-origin concept is augmented by considering inceptive effects, which motivate the introduction of an inceptive origin. The dependence of the inceptive-origin/virtual-conical-origin relationship with interaction strength yields several insights and provides a more rigorous framework to quantify inception strength than previously available. Finally, examination of the spanwise dependence of the growth of the quasi-conical separated shear layer shows that the outer (main) layer exhibits spanwise-homogeneous symmetry consistent with 2-D free-interaction theory, whereas the inner layer exhibits conical symmetry, consistent with 3-D (conical) free-interaction theory. The ramifications for shear layer and shock unsteadiness, as well as acceleration of the inner layer and secondary separation, are discussed. Recent developments and persisting fundamental challenges are discussed by Clemens and Narayanaswamy [2] and Gaitonde [3]. Significant insight has been gained through recent experimental and high-fidelity numerical efforts for canonical two-dimensional (2-D) configurations, which are spanwise homogeneous apart from side-wall effects. These include the impinging shock [4-7] and compression ramp [8,9] interactions. Comparatively less attention has been focused on the unsteady properties of canonical three-dimensional (3-D) STBLIs. These include configurations for which the mean flow is 3-D; that is, interactions that exhibit spanwise nonhomogeneity caused by the geometry/orientation of the shock generator which cannot be attributed to edge/side-wall effects. Specifically, interactions in which the shock or obstacle is swept with respect to the incoming flow are of interest. These include the sharp-fin (SF), swept-compression-ramp (SCR), and swept-impinging-shock (SIS) configurations, as commonly described [3,10]. Such interactions are of particular concern in application to supersonic/hypersonic inlets with side-wall compression, because side-wall compression may be exploited to increase the total pressure recovery [11,12]. More complex scenarios include flows with multiple interactions (shock trains) in scramjet inlet/ isolator sections, which highlight complexities associated with the dynamic coupling between canonical i...

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“…An in-house code ASTR, which has been applied to DNS [20][21] and large-eddy simulation(LES) [22] of boundary layer and channel flows, is used as the flow solver. The Navier-Stokes equations are projected to the Cartesian coordinate system of the computational domain and solved by the high-order finite difference method.…”

Section: Methodsmentioning

confidence: 99%

Non-equilibrium Turbulent Phenomena in a Transitional Flat Plate Boundary Layer

Liu¹,

Fang²,

Lu³

et al. 2019

Proceedings of Global Power &Amp; Propulsion Society

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Many recent laboratory experiments and numerical simulations supported a non-equilibrium dissipation scaling in decaying turbulence before it reaches an equilibrium state. However, these studies were mostly focus on canonical flows, such as homogeneous isotropic turbulence and gridgenerated turbulence. Beyond that, is it possible to observe the non-equilibrium phenomena in wall turbulence? In the present contribution, by analyzing a direct numerical simulation (DNS) database of a transitional boundary-layer flow, we show that the transition region and the nonequilibrium turbulence region, which are divided in the streamwise direction, presents different non-equilibrium scalings. Moreover, in the wall-normal direction, buffer layer, log layer and outer layer show different nonequilibrium phenomena which are very different from that in transitional channel flows. Thus, the turbulence models which consider the non-equilibrium phenomena should be modelled according to the dissipation scalings both in the streamwise direction and in the wall-normal direction. These findings are expected to shed light on the future modelling of various types of non-equilibrium turbulent flows.

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Investigation of Three-Dimensional Shock Wave/Turbulent-Boundary-Layer Interaction Initiated by a Single Fin

Cited by 51 publications

References 64 publications

On the turbulence amplification in shock-wave/turbulent boundary layer interaction

On the turbulence amplification in shock-wave/turbulent boundary layer interaction

Flow Similarity in Strong Swept-Shock/Turbulent-Boundary-Layer Interactions

Non-equilibrium Turbulent Phenomena in a Transitional Flat Plate Boundary Layer

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