Onset of separation unsteadiness in hypersonic shock boundary layer interaction on a cone-step
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arXiv
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| Autori principali: | , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866911306710253568 |
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| author | Jenquin, Chase Cui, Eric L. Dwivedi, Anubhav Sidharth, G. S. Jewell, Joseph S. |
| author_facet | Jenquin, Chase Cui, Eric L. Dwivedi, Anubhav Sidharth, G. S. Jewell, Joseph S. |
| contents | Shock-boundary layer interactions (SBLI) on hypersonic cone step flows exhibit a range of intrinsic unsteady behaviors, from shear-layer oscillations to large-scale pulsations. This work investigates the unsteadiness in a cone-step geometry at Mach 6 under quiet flow conditions at different freestream Reynolds numbers using time-resolved Schlieren imaging and spectral proper orthogonal decomposition (SPOD). Experimental results are compared with high-fidelity axisymmetric and three-dimensional simulations. Results demonstrate regime transition in the parameter space, across the unsteadiness boundary, all the way from shear-layer breakdown to shock system oscillations and ultimately to large-amplitude pulsations. The dominant mode in the experiments and the simulations corresponds to a Strouhal number St ~ 0.17 for small oscillations reducing to St ~ 0.13 for large pulsations. A detailed description of the unsteady shock dynamics, the instability of the shear layer during onset of unsteadiness and an analysis of the nonlinear limit cycle is presented. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_07089 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Onset of separation unsteadiness in hypersonic shock boundary layer interaction on a cone-step Jenquin, Chase Cui, Eric L. Dwivedi, Anubhav Sidharth, G. S. Jewell, Joseph S. Fluid Dynamics Shock-boundary layer interactions (SBLI) on hypersonic cone step flows exhibit a range of intrinsic unsteady behaviors, from shear-layer oscillations to large-scale pulsations. This work investigates the unsteadiness in a cone-step geometry at Mach 6 under quiet flow conditions at different freestream Reynolds numbers using time-resolved Schlieren imaging and spectral proper orthogonal decomposition (SPOD). Experimental results are compared with high-fidelity axisymmetric and three-dimensional simulations. Results demonstrate regime transition in the parameter space, across the unsteadiness boundary, all the way from shear-layer breakdown to shock system oscillations and ultimately to large-amplitude pulsations. The dominant mode in the experiments and the simulations corresponds to a Strouhal number St ~ 0.17 for small oscillations reducing to St ~ 0.13 for large pulsations. A detailed description of the unsteady shock dynamics, the instability of the shear layer during onset of unsteadiness and an analysis of the nonlinear limit cycle is presented. |
| title | Onset of separation unsteadiness in hypersonic shock boundary layer interaction on a cone-step |
| topic | Fluid Dynamics |
| url | https://arxiv.org/abs/2512.07089 |