Numerical Analysis of the Effect of EHD Phenomena on the Behavior of the Laminar Flow over a Two-Dimensional Circular Cylinder

In this research, numerical simulation of Electrohydrodynamic (EHD) actuator's effects on the flow around a circular cylinder by using a finite volume method has been investigated. This is one of the new ways for increasing the power of heat transfer in flow fields which involve heat exchange. In this article, the first step of this idea which describes the behavior of the flow has been studied. Two plate electrodes are flush-mounted on the surface of the cylinder and one wire electrode is placed on the line with zero angle of attack relative to the stagnation point and is excited with DC power supply. The discharge produces an electric force and changes the local momentum behaviors in the fluid layers. For this purpose, after selecting proper domain and boundary conditions, the electric field relating to the problem has been analyzed and then the results in the form of electrical body force were included in the governing equations of the fluid field (Navier-Stokes equations). The effect of ionic wind resulted from the Electrohydrodynamic actuator, on the velocity, pressure and the wake behind the cylinder has been considered. It is seen from the results that the fluid flow accelerates in the nearest wall of the frontal half of the cylinder and the pressure difference between frontal and hinder cylinder is increased.