"An adverse pressure gradient strongly favors transition to turbulent ﬂow. In contrast, strong favorable pressure gradients (where p decreases in the downstream direction) tend to preserve initially laminar ﬂow."(adsbygoogle = window.adsbygoogle || []).push({});

"High values of M∞ and low values of Re tend to encourage laminar ﬂow"

Looking at those two statements from the "fundamentals of aerodynamics", I think the fluid velocity alone does not determine whether the fluid will be laminar or turbulent.(high V gives high mach number but also high Reynolds number). Can someone explain why/how the mach number comes into play?

I would also like to know why an adverse pressure gradient favors transition to turbulent flow.

Thank you!

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# Aerospace Reynolds number & Mach number for flow regime

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