# Why Does Fluid Accelerate and Decelerate Over a Convex Surface?

• KishoreAM
In summary, when fluid flows over a convex surface, it accelerates due to a reduction in cross-sectional area and then decelerates once the obstruction is passed. This phenomenon is known as flow attachment, where the fluid tends to follow the shape of the part it gets around in order to fill the void left by its movement. This creates the illusion of the fluid "sticking" to the part.
KishoreAM
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

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.

## What is flow over submerged bodies?

Flow over submerged bodies is the study of how fluids, such as water or air, behave when they encounter objects that are fully or partially submerged in them. This can include a wide range of objects, from ships and submarines to dams and underwater structures.

## What factors influence the flow over submerged bodies?

The flow over submerged bodies is influenced by several factors, including the shape and size of the body, the density and viscosity of the fluid, and the speed of the flow. Other factors such as turbulence, boundary layer effects, and surface roughness may also play a role.

## What are some applications of studying flow over submerged bodies?

Understanding flow over submerged bodies has many practical applications, such as designing more efficient ships and submarines, predicting the forces on underwater structures, and improving the performance of water turbines and propellers. It is also important for environmental studies, such as predicting the dispersion of pollutants in the ocean.

## What are the different types of flow over submerged bodies?

There are two main types of flow over submerged bodies: laminar and turbulent. Laminar flow is characterized by smooth, orderly motion of the fluid particles, while turbulent flow is chaotic and highly unpredictable. In most cases, the flow over submerged bodies is a combination of both laminar and turbulent flow.

## How is the flow over submerged bodies studied?

Flow over submerged bodies is studied using experimental and computational methods. Experimental methods involve conducting physical experiments in laboratories or in the field, while computational methods use mathematical models and simulations to predict the behavior of fluids. Both methods play important roles in understanding and analyzing the flow over submerged bodies.

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