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The interaction of separation and transition in a laminar separation bubble (LSB) was investigated in a synergistic fashion using wind tunnel and free-flight experiments, direct numerical simulations (DNS), and linear theory. Initial DNS resulted in a larger separated region compared to the wind tunnel experiments. However, the addition of random disturbances to the local upstream boundary layer in DNS, to account for freestream turbulence in wind tunnel experiments, resulted in remarkable agreement in topology and frequency content of the LSB. Scientific free-flight experiments showed LSB characteristics matching those from the wind tunnel experiments for the same Reynolds number and angle of attack. In all cases, linear stability theory provided accurate estimates for the unstable frequency content.

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Numerical and Experimental Investigations of Transition in a Laminar Separation Bubble

  • 会议论文

  • 发表日期：

    2026年

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  • David Borgmann,
  • Shirzad Hosseinverdi,
  • Jesse Little,
  • Hermann Fasel

摘要

The interaction of separation and transition in a laminar separation bubble (LSB) was investigated in a synergistic fashion using wind tunnel and free-flight experiments, direct numerical simulations (DNS), and linear theory. Initial DNS resulted in a larger separated region compared to the wind tunnel experiments. However, the addition of random disturbances to the local upstream boundary layer in DNS, to account for freestream turbulence in wind tunnel experiments, resulted in remarkable agreement in topology and frequency content of the LSB. Scientific free-flight experiments showed LSB characteristics matching those from the wind tunnel experiments for the same Reynolds number and angle of attack. In all cases, linear stability theory provided accurate estimates for the unstable frequency content.