Numerical Investigation of Control of Weakly Conductive Fluids by Lorentz Forces

摘要

The objective of this paper is to develop an efficient control algorithm for managing flow around a circular cylinder in weakly conductive fluids. The Lorentz force is applied on the cylinder surface in the circumferential direction to control the flow. We investigate numerically the unsteady two-dimensional flow and characterize the different flow regimes by the Lattice Boltzmann method (LBM). Numerical results verify that the LBM methodology is a powerful numerical tool for simulating the flow around a circular cylinder in electromagnetic field, and that emphasis is placed on the exposure of physical phenomena as well as a quantitative detection of the flow field. Moreover, it is revealed that Lorentz forces can prevent the boundary layer from separation, reduce drag and lift, and suppress the shedding of vortices.