The flow around a bluff body has many applications in engineering fields. The flow wake of the cylinder can generate unsteady forces which have the potential to damage the structural integrity of the body. Research on this kind of problem often arises from the interest to understand the loads on the structure and to further control the fluid flow to reduce the fluid force which may cause structural damage under some unfavorable conditions. The ability to control a flow field actively or passively to get the desired change is of a lot of technological importance.

Researchers are trying to test different passive and active methods of control to achieve transition delay, drag reduction, lift enhancement, separation postponement, and turbulent augmentation. To achieve any of these end results, flow separation may have to be either provoked or prevented, the transition from laminar to turbulent flow may have to be either advanced or delayed, and turbulence may be either enhanced or suppressed while using passive or active control methods.

The main aim of this Special Issue is to highlight how control methods can be used to achieve the above-mentioned goals using different numerical schemes. The second aim is to study the dependence of the wake on Reynolds numbers and different passive control device shapes from low Reynolds numbers to high Reynolds numbers. We also seek to enrich the data related to the control of fluid flows, especially for low and higher Reynolds numbers. Original research and review articles are welcome.

Potential topics include but are not limited to the following:

• Lattice Boltzmann methods
• Computational fluid dynamics
• Reduction of fluid forces
• Suppression of vortex shedding
• Flow past tandem bluff bodies
• Flow past side-by-side bluff bodies
• Hydrodynamic forces
• Passive control devices
• Active control devices