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Numerical investigations were carried out for the boundary layer of an ogive geometry with a blunted nose tip and for the flow conditions of the German Aerospace Center (DLR) hypersonic wind tunnel (H2K) experiments at Mach 5.3. Linear Stability Theory (LST) analysis identified amplified first- and second-mode waves. Various nonlinear transition scenarios were examined using Direct Numerical Simulations (DNS). The simulation results for a “controlled” first mode oblique breakdown showed a transition development in the boundary layer advancing towards the late nonlinear stages and turbulence, with oblique first-mode waves initiating transition. The forcing amplitudes were selected to align the transition onset in simulations with that observed in experiments.

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Numerical Investigations of the Nonlinear Stages of Hypersonic Boundary-Layer Transition for an Ogive Geometry

  • 会议论文

  • 发表日期：

    2026年

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  • Christoph Hader,
  • Hermann Fasel

摘要

Numerical investigations were carried out for the boundary layer of an ogive geometry with a blunted nose tip and for the flow conditions of the German Aerospace Center (DLR) hypersonic wind tunnel (H2K) experiments at Mach 5.3. Linear Stability Theory (LST) analysis identified amplified first- and second-mode waves. Various nonlinear transition scenarios were examined using Direct Numerical Simulations (DNS). The simulation results for a “controlled” first mode oblique breakdown showed a transition development in the boundary layer advancing towards the late nonlinear stages and turbulence, with oblique first-mode waves initiating transition. The forcing amplitudes were selected to align the transition onset in simulations with that observed in experiments.