What is a bluff body?

What is a bluff body?

A bluff body can be defined as a body that, as a result of its shape, has separated flow over a substantial part of its surface. Usually bluff bodies induce flow separation at positions where the velocity at the edge of the boundary layer is higher than the free stream velocity.

What are streamline bodies?

A streamlined body is a shape that decreases the friction drag between a fluid, such as air and water, and an object that passes through that fluid. The streamlined shaped body experiences minimum resistance when travelling through water or air. It helps to reduce friction.

What is bluff body in aerospace engineering?

[¦bləf ¦bäd·ē] (aerospace engineering) A body having a broad, flattened front, as in some reentry vehicles.

What is Wake and bluff body?

Bluff body flows are characterized by flow separation which produces a region of disturbed. flow behind, i.e. the wake. Within the near-wake various forms of flow instabilities, both. convective and absolute, may be triggered and amplified.

When compared to a streamlined body of bluff body will have?

1 Approved Answer When compared to a streamlined body, a bluff body will have more pressure…

What is bluff body and its applications?

Flow past a bluff body has a considerable significance in many engineering applications such as bridges, offshore structures, buildings, cooling towers, petroleum pipelines in cross flow, and heat exchanger tubes. The frequency and amplitude of vibrations are the most significant parameters of flow-induced motions.

What are the examples of streamlined bodies?

Examples: Fishes have streamlined bodies so that they have less resistance when swimming in water. Birds have a streamlined body to make their flight easier through the air. Snakes have a streamlined body to assist them move forward.

What is an example of streamlining?

An example of streamline is a slick, smooth aircraft. Streamline means to design something in a way that provides little resistance such as from air, water or quick movement. When you design an ultra-slick air craft with almost no wind resistance, this is an example of when you streamline.

What is a bluff body and what are its applications?

Who has streamlined body?

The shape of the body is said to be streamlined if the body tapers at both ends. Examples: Fishes have streamlined bodies so that they have less resistance when swimming in water. Birds have a streamlined body to make their flight easier through the air. Snakes have a streamlined body to assist them move forward.

How does streamlining reduce drag?

streamlining, in aerodynamics, the contouring of an object, such as an aircraft body, to reduce its drag, or resistance to motion through a stream of air. This eddy formation represents a reduction in the downstream pressure on the moving object and is a principal source of drag.

What is Strouhal number?

The Strouhal number represents the ratio of inertial forces due to the local acceleration of the flow to the inertial forces due to the convective acceleration.

What is a streamlined body?

• A streamlined body is defined as that body whose surface is aligned with the streamlines, when the body is placed in the flow. • Thus, the body offers least resistance in terms of Pressure drag. • Most of the drag experienced by the body is due to Viscous/Frictional drag, which depends on the surface area exposed to fluid.

• A bluff body is defined as that body whose surface is not aligned with the stream-lines, when placed in the flow. • Thus, the body offers lesser resistance in terms of Viscous/Frictional drag.

What is the dominant source of drag for a bluff body?

For a bluff body, the dominant source of drag is pressure drag. For a given frontal area and velocity, a streamlined body will always have a lower resistance than a bluff body.

Why are cylinders and spheres called bluff bodies?

Cylinders and spheres are considered bluff bodies because at large Reynolds numbers the drag is dominated by the pressure losses in the wake. Therefore, when the drag is dominated by a frictional component, the body is called a streamlined body; whereas in the case of dominant pressure drag, the body is called a bluff body.