Review and synthesis of roughness-dominated transition correlations for reentry applications

By D. Reda. 2002

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Laminar–turbulent transition induced by a discrete roughness element in a supersonic boundary layer (2013, methodology): “The model suggests that the transition Reynolds number (based on the momentum thickness θ ) varies according to (h/θ)−1 for stagnation point flow with constant wall temperature, thereby agreeing with the ballistic-range data presented by Reda (2002).”
Effects of Roughness on Hypersonic Boundary-Layer Transition (2007, unknown): “Probably the best known is the Rek approach, popularized recently by Reda of NASA Ames Research Center [9,30].”
Fifty years of hypersonics: where we've been, where we're going (2003, background): “Reda [32] continues: ‘‘Based on present understanding, transition initially occurs on the nosetip in the vicinity of the sonic line, ðS=RNÞE0:7; and progresses forward at a rate dependent on both the material surface roughness and the reentry vehicle trajectory.”
Direct Numerical Simulation on the Receptivity, Instability, and Transition of Hypersonic Boundary Layers (2012, background): “The hypersonic boundary-layer transition can be significantly affected by the existence of surface roughness (Reda 2002, Schneider 2008a).”
Developing mechanism-based methods for estimating hypersonic boundary-layer transition in flight: The role of quiet tunnels (2013, background): “Attachment lines [10], entropy layers [11], roughness [12, 13, 14, 15], and ablation [16] may generate additional instabilities.”