Advanced International Journal for Research

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Stability of Hypersonic Boundary Layers on Circular Cones: Effect of Nose Bluntness

Author(s) Dr. Jayahar Sivasubramanian, Ms. Suman S Goudar
Country India
Abstract The nose bluntness is one of the key design parameters as it determines the aerodynamic characteristics of the body. Studies have shown that it also affects the stability of the body and plays an important role in determining the transition location. In this work, cones with varying nose radius are compared for the aerodynamics and the stability characteristics. A sharp cone is analyzed as the base geometry to understand the effect of nose bluntness. The domain is discretized using fine structured grids with high density near the surface to better capture the boundary layer features. First, laminar simulations of the flow over the cones were carried out using the Stanford University Unstructured (SU2) CFD solver. The boundary layer profiles were then extracted and validated with the profiles from literature. Subsequently, these profiles were fed into a python code to obtain the input file with the derivatives needed for the LST solver. The Eigen value spectrum obtained from the LST solver is analyzed for various frequencies and presence of the unstable Mack instability mode is captured if present. The procedure is repeated for various streamwise locations to obtain the Neutral Stability diagrams for different cones with varying nose bluntness. The laminar flow-field is also analyzed to understand the change in flow features with increase in bluntness. It was observed that the instability region moves downstream with increase in nose radius. Hence increase in nose radius has a stabilizing effect on the flow.
Keywords Nose Bluntness, Stability, Hypersonic Boundary Layer, Transition, Linear stability theory (LST)
Field Engineering
Published In Volume 7, Issue 2, March-April 2026
Published On 2026-04-15
DOI https://doi.org/10.63363/aijfr.2026.v07i02.4917
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