DNS of surface roughness effects on laminar–turbulent transition in a supersonic boundary layer

The effects of the distributed surface roughness on mean flow distortion and generation of flow instabilities in a supersonic boundary layer at Mach number 2 are studied with the direct numerical simulation. Roughness elements cause distortions of the mean flow field and flow unsteadiness in their w...

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Bibliographic Details
Main Authors: Khotyanovsky, Dmitry, Kudryavtsev, Alexey
Format: Conference Proceeding
Language:English
Subjects:
Boundary layer
Boundary layer transition
Computational fluid dynamics
Computer simulation
Direct numerical simulation
Flow distortion
Fluid flow
Mach number
Supersonic boundary layers
Surface roughness
Surface roughness effects
Variation
Vortices
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Summary:The effects of the distributed surface roughness on mean flow distortion and generation of flow instabilities in a supersonic boundary layer at Mach number 2 are studied with the direct numerical simulation. Roughness elements cause distortions of the mean flow field and flow unsteadiness in their wake. Farther downstream, growth of the fluctuations contained in the streamwise vortices and the interaction of the adjacent vortices lead to a breakup of the boundary layer manifesting the beginning of the laminar–turbulent transition.
ISSN:0094-243X
1551-7616
DOI:10.1063/1.4964000