ghost85 said:I am doing a paper regarding active techniques to control/manipulate vortex shedding in the near wake behind a 2D or axisymmetric bluff body, such as cylinder.
May I know what are the available active techniques used in controlling vortex shedding?
Thank you.
Vortex shedding is a phenomenon that occurs when a fluid flows past a bluff body, such as a cylinder or a bridge. It results in the formation of alternating vortices on either side of the body, which can cause undesirable vibrations and drag forces. This occurs due to the interaction between the fluid flow and the body's geometry, creating areas of low pressure behind the body that induce the formation of vortices.
Some common active techniques used to control vortex shedding include modifying the body's geometry, using flow control devices such as vortex generators or spoilers, and applying oscillatory control techniques such as active flow control or synthetic jet actuators. These techniques aim to disrupt the formation of vortices and reduce their strength, thereby mitigating the negative effects of vortex shedding.
The effectiveness of active techniques in controlling vortex shedding depends on various factors such as the body's geometry, flow conditions, and the specific technique used. In some cases, active techniques can completely eliminate vortex shedding, while in others, they may only reduce its intensity. It is essential to carefully consider these factors and conduct experiments or simulations to determine the most effective technique for a specific application.
Active techniques can be applied to various types of bluff bodies, including cylinders, spheres, and airfoils. However, the effectiveness of these techniques may vary depending on the body's shape, size, and flow conditions. It is important to assess the specific characteristics of the body and the flow before deciding on the most suitable active technique for controlling vortex shedding.
While active techniques can effectively reduce or eliminate vortex shedding, they may also have some drawbacks. These may include increased complexity, higher costs, and potential maintenance issues. Additionally, some techniques may also introduce additional noise or vibrations, which could affect the overall performance of the system. It is crucial to carefully consider these factors and weigh them against the benefits before implementing active techniques for controlling vortex shedding.