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Reference.org
Bypass transition
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<p>A bypass transition is a <a href="/facts/Laminar%25E2%2580%2593turbulent_transition/NKeUj2qM">laminar–turbulent transition</a> in a fluid flow over a surface. It occurs when a <a href="/facts/Laminar_flow/RFXN4eAC">laminar</a> <a href="/facts/Boundary_layer/go8gqWM1">boundary layer</a> transitions to a <a href="/facts/Turbulent/NpgFUhG5">turbulent</a> one through some secondary <a href="/facts/Fluid_instability/V0uNz1oI">instability</a> mode, bypassing some of the pre-transitional events that typically occur in a natural laminar–turbulent transition. </p>