A perspective on transonic buffet over an unswept finite wing
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| Format: | Preprint |
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2025
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| _version_ | 1866912588979240960 |
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| author | Singh, Magan Venkatraman, Kartik |
| author_facet | Singh, Magan Venkatraman, Kartik |
| contents | Transonic buffet is a well-known aerodynamic instability of shock/boundary layer interaction in the transonic regime for aircraft. So far, this phenomenon has typically been investigated by modal and correlation analyses. Here, we present a perspective on low-frequency unsteadiness, of the order of St ~ O(-2), in transonic buffet, using results from temporal evolution of skin friction lines and correlation analysis on the surface of Benchmark Supercritical Wing (BSCW) with an aspect ratio AR = 2. Skin friction lines and critical point theory are well established to describe 3D separated flows based on critical points -- nodes, foci, and saddles. Dynamics of these critical points are found in a certain topology in separation regions for different angles of attack, Mach 0.85, and Reynolds number 4.491 million. The topology of critical points consists of pairs of contra-rotating unstable foci that contribute to the mechanism of formation and propagation of buffet cells -- pockets of shock foot oscillations. The dynamic nature of these critical points changes the pressure distribution on the surface, which is reflected as wave propagation in correlation plots. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2509_12642 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | A perspective on transonic buffet over an unswept finite wing Singh, Magan Venkatraman, Kartik Fluid Dynamics Transonic buffet is a well-known aerodynamic instability of shock/boundary layer interaction in the transonic regime for aircraft. So far, this phenomenon has typically been investigated by modal and correlation analyses. Here, we present a perspective on low-frequency unsteadiness, of the order of St ~ O(-2), in transonic buffet, using results from temporal evolution of skin friction lines and correlation analysis on the surface of Benchmark Supercritical Wing (BSCW) with an aspect ratio AR = 2. Skin friction lines and critical point theory are well established to describe 3D separated flows based on critical points -- nodes, foci, and saddles. Dynamics of these critical points are found in a certain topology in separation regions for different angles of attack, Mach 0.85, and Reynolds number 4.491 million. The topology of critical points consists of pairs of contra-rotating unstable foci that contribute to the mechanism of formation and propagation of buffet cells -- pockets of shock foot oscillations. The dynamic nature of these critical points changes the pressure distribution on the surface, which is reflected as wave propagation in correlation plots. |
| title | A perspective on transonic buffet over an unswept finite wing |
| topic | Fluid Dynamics |
| url | https://arxiv.org/abs/2509.12642 |