Surface slip, characterized by a slip length, λ, suppresses flow separation induced by Gaussian-shaped deformations on a flat plate. Bumps generate more intense regions of reversed flow than gaps, requiring larger λ to inhibit separation. The study extends to double-bump configurations, where the distance between bumps establishes either a stabilizing effect or nonlinear oscillatory flow. However, increasing λ ultimately suppresses this phenomenon and eliminates all pockets of separated flow.
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Ceccacci et al. (2024) studied this question.
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