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In this paper, the effectiveness of electromagnetic forces on controlling themotion of a sedimenting elliptical particle is investigated using the immersedinterface-lattice Boltzmann method (II-LBM), in which a signed distancefunction is adopted to apply the jump conditions for the II-LBM and to addexternal electromagnetic forces. First, mechanisms of electromagnetic controlon suppressing vorticity generation based on the vorticity equation and vortexshedding based on the streamwise momentum equation are discussed. Then,systematical investigations are performed to quantify and qualify the effectsof the electromagnetic control by changing the electromagnetic strength, theinitial orientation angle of the elliptical particle, and the density ratio ofthe particle to the fluid. To demonstrate the control effect of differentcases, comparisons of vorticity fields, particle trajectories, orientationangles, and energy transfers of the particles are presented. Results show thatthe rotational motion of the particle can be well controlled by appropriatemagnitudes of electromagnetic forces. In a relatively high solid to fluiddensity ratio case where vortex shedding appears, the sedimentation speed canincrease nearly 40\% and the motion of the particle turns into a steady descentmotion once an appropriate magnitude of the electromagnetic force is applied.When the magnitude of the electromagnetic force is excessive, the particle willdeviate from the center of the side walls. In addition, the controllingapproach is shown to be robust for various initial orientation angles and solidto fluid density ratios.

Control of a sedimenting elliptical particle by electromagnetic forces