Why Does Fluid Accelerate and Decelerate Over a Convex Surface?

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Fluid accelerates over a convex surface due to a reduction in cross-sectional area, which necessitates an increase in velocity to maintain flow rate. Once the fluid passes the obstruction, it decelerates back to its original velocity. The concept of flow attachment explains that as the area increases after the convex shape, the fluid tends to follow the contour of the surface. This behavior is influenced by the fluid's desire to fill any voids created by moving objects, resulting in a "sticking" effect. Understanding these dynamics is crucial for analyzing fluid behavior in various applications.
KishoreAM
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Guys...Can anyone explain me why fluid accelerates and then decelerates when flowing over a convex surface
and also concept of flow attachment in simple terms
 
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KishoreAM said:
why fluid accelerates and then decelerates when flowing over a convex surface
It causes a reduction in cross-sectional area, so the velocity must be accelerated to keep up with the flow rate. It goes back to its original velocity once the obstruction is passed.
KishoreAM said:
also concept of flow attachment in simple terms
As the cross-sectional area increases aft of the "bump", the fluid wants to fill the new enlarged area, so it tends to follow the shape of the part it gets around. Of course, the faster the fluid goes, the harder it will be for it to follow the shape.

If you imagine a solid part moving in a non-moving fluid, you can imagine that, as it moves, it leaves an empty space while displacing the fluid in front of it. The fluid just want to fill the void to equilibrate everything once more, thus it looks like the fluid "sticks" to the part. If the fluid moves and the part is fixed, the same thing happens.
 
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