Maksim V. Ustinov

DOI Number XXX-YYY-ZZZ

Conference Number HiSST 2018_19601030

Amplitude method describing influence of surface roughness and free-stream turbulence level on laminar-turbulent transition caused by cross-flow instability is developed and tested. In contrast to e^N method it is based on computation of amplitudes of steady and non-steady cross-flow instability modes in the boundary layer. Initial amplitudes of these modes were found from solution of receptivity problem to surface roughness and free-stream turbulence respectively. Subsequent evolution of these disturbances is evaluated by means of non-linear PSE-method modified for perturbations with random phases. Point where sum of amplitudes of steady and non-steady modes reaches threshold value is treated as transition location. Method developed was verified using available experimental data obtained in low-speed wind tunnels and applied to transition prediction at the swept wing for supersonic flow velocity.

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In Categories: Boundary Layer Control, High-Speed Aerodynamics and Aerothermodynamics, HiSST 2018, Hypersonic Aerodynamics, Transition to Turbulence, Turbulence Modeling and Simulation
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