Topology Optimization Method for Trajectory Control of Particle Through Fluid‐Structure Interaction

ABSTRACT This research develops a new topology optimization (TO) scheme to manipulate the trajectory of particle suspended in fluid by reverting fluid motion by fluid‐structure interaction (FSI). The simulation of particle trajectory considering the effect of FSI is both challenging and largely unexplored in the context of TO, and the TO of particle‐fluid‐structure interaction system has not been considered yet. The drag force of particle being mainly determined by the relative velocity between the particle velocity and the fluid velocity, the change of the particle trajectory can be attributed to the change of the fluid velocity originated by the structural deformation. To consider this complex coupling from an optimization point of view, this research extends the monolithic simulation and optimization method for FSI to the particle optimization method. The monolithic design method for FSI developed for TO considers the structure deformation on fluid motion and allows to find out optimal topologies. The adjoint sensitivity analysis is developed and applied for this multiphysics system. The effectiveness of the proposed method is demonstrated through several transient topology optimization problems that highlight the influence of FSI on particle motion.