A Parametric investigation of oblique shockwave / turbulent boundary layer interaction using LES

Brandon Morgan, Soshi Kawai, Sanjiva K. Lele

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Large-eddy simulation (LES) of an oblique shock impinging on a supersonic turbulent boundary layer (M∞ = 2.28, φ{symbol} = 6.5-9.5°, Reθ = 1500, 2300, 4800) is carried out with a high-order compact differencing scheme using localized artificial diffusivity (LAD) for shock capturing. Solution sensitivity is then investigated with regards to mesh resolution, domain size, Reynolds number, and wedge angle. Progressive mesh refinement and comparison with the literature are used to establish confidence in solution quality. It is found that the separation bubble is not significantly affected by increasing the spanwise domain beyond 3δ or by increasing the streamwise domain beyond 5δ past the shock impingement point. Additionally, the size of the separation bubble, while under-predicted with respect to experiment, does not appear to be significantly affected by Reynolds number (over the range considered). This leads us to speculate that a commonly observed discrepancy between simulation and experiment - which previously has been explained as a result of difference in Reynolds number - may instead be due to some three-dimensional effect in the experiment. Additionally, through analysis of the spectral content of the wall pressure signal in the separation bubble, the expected low-frequency motion is identified with time scale ~O(100δ/u∞); however, it appears that Reynolds number, while having little effect on the size of the mean separation bubble, may affect the time scale at which low-frequency unsteadiness is observed. Likewise, it is found that an increase in wedge angle tends to shift the peak low-frequency energy out towards longer time scales. Finally, through analysis of low-pass filtered data fields, evidence is found of a correlation between the low-frequency motion and periodic mass entrainment/release in the separation bubble.

Original languageEnglish
Title of host publication41st AIAA Fluid Dynamics Conference and Exhibit
PublisherAmerican Institute of Aeronautics and Astronautics Inc.
ISBN (Print)9781600869471
DOIs
Publication statusPublished - 2011
Externally publishedYes
Event41st AIAA Fluid Dynamics Conference and Exhibit 2011 - Honolulu, HI, United States
Duration: 2011 Jun 272011 Jun 30

Publication series

Name41st AIAA Fluid Dynamics Conference and Exhibit

Other

Other41st AIAA Fluid Dynamics Conference and Exhibit 2011
CountryUnited States
CityHonolulu, HI
Period11/6/2711/6/30

ASJC Scopus subject areas

  • Fluid Flow and Transfer Processes
  • Energy Engineering and Power Technology
  • Aerospace Engineering
  • Mechanical Engineering

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  • Cite this

    Morgan, B., Kawai, S., & Lele, S. K. (2011). A Parametric investigation of oblique shockwave / turbulent boundary layer interaction using LES. In 41st AIAA Fluid Dynamics Conference and Exhibit (41st AIAA Fluid Dynamics Conference and Exhibit). American Institute of Aeronautics and Astronautics Inc.. https://doi.org/10.2514/6.2011-3430