Particle-Impingement Simulations for a Blunt Cone in Hypersonic Flow

Russo, Vincenzo; Hasnine, Sayed Mohammad Abdullah Al; Brehm, Christoph

doi:10.2514/6.2021-0967

Cited by 6 publications

(4 citation statements)

References 29 publications

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“…A possible explanation for this could be a transient growth-like mechanism that is active and manifests itself in the streamwise velocity and temperature disturbances. Similar observations with a more prominent non-modal growth mechanism was observed for particle impingement on a blunt cone in Russo et al (2021) consistent with optimal growth results obtained in Paredes et al (2019). The disturbance flow field spectra at…”

Section: Disturbance Flow Features Generated By Particle Impingementsupporting

confidence: 88%

“…This observation is in agreement to the reconstructed pressure field from the acoustic branches displayed in figure 19. It should be noted that, while non-modal growth of disturbances has not been observed in this study it appears to be a possible scenario that can be triggered by particle impingement (see Russo et al 2021).…”

Section: Full Reconstruction Of the Disturbance Flow Fieldmentioning

confidence: 61%

“…The PSIC approach has also been employed in the two prior direct numerical simulation (DNS) studies by Chuvakhov et al (2019) and Browne et al (2021). Russo et al (2021) conducted particle-induced transition simulation on a blunt cone and showed some evidence that transient growth can be triggered by particle impingement. Biorthogonal decomposition of the disturbance flow field generated by particle impingement was performed and validated in Hasnine et al (2020Hasnine et al ( , 2021, which will be employed in more detail here to gain insight about the receptivity process involving particle impingement.…”

Section: Introductionmentioning

confidence: 99%

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Biorthogonal decomposition of the disturbance flow field generated by particle impingement on a hypersonic boundary layer

A. Al Hasnine,

Russo,

Tumin

et al. 2023

J. Fluid Mech.

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The disturbance flow field in a hypersonic boundary layer excited by particle impingement was investigated with a focus on the first stage of the laminar-to-turbulent transition process, namely the receptivity process. A previously validated direct numerical simulation approach adopting disturbance flow tracking is used to simulate the particle-induced transition process. Particle impingement generates a highly complex disturbance flow field that can be characterised by a wide range of frequencies and wavenumbers. After providing some insight about the spectral characteristics of the disturbance flow field in the frequency and wavenumber domains, biorthogonal decomposition is employed to reveal the composition of the disturbance flow field consisting of different continuous and discrete eigenmodes that are triggered through particle impingement. The disturbance flow characteristics for different frequency and wavenumber pairs are discussed where large contributions in the disturbance flow spectrum are observed in the vicinity of the impingement location. A significant amount of the disturbance energy is diverted into the free stream leading to large coefficients of projection for the slow and fast acoustic branches while contributions to the entropy and vorticity branches are negligible. In addition to the continuous acoustic spectra, the first-, second- and other higher-order Mack modes are activated and provide large contributions to the disturbance flow field inside the boundary layer. Finally, it is demonstrated that the disturbance flow field in the vicinity of the impingement location can be reconstructed with a maximum relative error of $2.3\,\%$ by employing a theoretical biorthogonal eigenfunction system expansion and by considering contributions from fast and slow acoustic waves and at most four discrete modes only.

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Section: Disturbance Flow Features Generated By Particle Impingementsupporting

confidence: 88%

Section: Full Reconstruction Of the Disturbance Flow Fieldmentioning

confidence: 61%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Biorthogonal decomposition of the disturbance flow field generated by particle impingement on a hypersonic boundary layer

A. Al Hasnine,

Russo,

Tumin

et al. 2023

J. Fluid Mech.

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“…These traveling disturbances can manifest as the experimentally observed inclined structures above the boundary-layer. Potential mechanisms for the receptivity of these non-modal waves was provided by Russo et al [27] by considering particle impingement and Goparaju et al [28] by the interaction of stochastic disturbances with the leading-edge. Further, Hartman et al [29] examined the response of wavepackets initiated in the entropy-layer and reported large growth of linear oblique disturbances closer to the leading edge, which were not captured by the conventional linear/parabolic stability theories.…”

Section: Introductionmentioning

confidence: 99%

Role of entropic-instabilities in laminar-turbulent transition on a blunted flat plate

Goparaju¹,

Gaitonde²

2021

Preprint

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The effects of entropic-instabilities on the laminar-turbulent transition dynamics of a blunted flat plate at Mach 4 are numerically investigated through linear and nonlinear approaches. Linear wavepacket analysis reveals amplifying oblique first-modes as well as planar and oblique entropylayer disturbances. The receptivity of entropic-instabilities is found to be largest for actuation seeded in the entropy-layer; the corresponding linear evolution is characterized by an intensification in the wall-normal plane, coupled with streamwise tilting. Disturbances in the entropy-layer interact non-linearly with each other through the oblique breakdown mechanism, inducing streamwise streaks in the boundary-layer. These undergo further destabilization downstream leading to turbulence onset. Different mechanisms of interest are extracted with modal decomposition techniques best suited for each. Dynamic mode decomposition (DMD) reveals sinuous subharmonic oscillations induced by the entropic-disturbances as the dominant streak instability mechanism. On the other hand, spectral proper orthogonal decomposition (SPOD) elicits the slanted hook -shaped structures in the temperature perturbations, which are attributable to the Orr like-mechanism in the entropy-layer. Furthermore, cross-bispectral mode decomposition (CBMD) shows that the temperature perturbations amplify on the crests of the low-speed streaks in the entropy-layer and generates disturbances through triadic interactions. These newer disturbances further interact, resulting in the transfer of perturbation energy into the boundary-layer. This eventually leads to spanwise homogenization and near-wall streak generation, reflecting late nonlinear stages of transition. Towards the end of breakdown region, spectral broadening accompanied by the appearance of an inertial sub-range in the boundary-layer indicates the approach of the flow towards turbulence.

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Particle Impingement Simulations for First and Second Mode Dominated High-Speed Boundary Layers

Hasnine

Russo

Brehm

2021

Aiaa Aviation 2021 Forum

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Particle-Impingement Simulations for a Blunt Cone in Hypersonic Flow

Cited by 6 publications

References 29 publications

Biorthogonal decomposition of the disturbance flow field generated by particle impingement on a hypersonic boundary layer

Biorthogonal decomposition of the disturbance flow field generated by particle impingement on a hypersonic boundary layer

Role of entropic-instabilities in laminar-turbulent transition on a blunted flat plate

Particle Impingement Simulations for First and Second Mode Dominated High-Speed Boundary Layers

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