Disturbance Flow Field Analysis of Particulate Interaction with High Speed Boundary Layers

Hasnine, Sayed Mohammad Abdullah Al; Russo, Vincenzo; Browne, Oliver M.; Tumin, Anatoli; Brehm, Christoph

doi:10.2514/6.2020-3046

Cited by 4 publications

(3 citation statements)

References 39 publications

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“…For more details about this approach and validation results, see Browne et al (2021). The simulation approach has also been validated by Hasnine et al (2020) and Browne et al (2019bBrowne et al ( , 2020bBrowne et al ( , 2021.…”

Section: Particle-source-in-cell Simulation Approachmentioning

confidence: 99%

“…and L 0 , L 1 , H 1 , H 2 and H 3 are 16×16 matrices and the superscript T denotes the transpose of the vector. More details about the exact form of these matrices can be found in Hasnine et al (2020) and Tumin (2007).…”

Section: Local Evpmentioning

confidence: 99%

“…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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