Computational fluid dynamics optimization of shape of sprue for die casting considering product quality

Computational fluid dynamics (CFD) simulators have recently been used for optimization in die casting and various other fields. However, solving an optimization problem with a CFD simulator (CFD optimization problem) has the issue of uncertainty in the evaluated values from the CFD simulations. Such problems are, of course, difficult to optimize compared to general problems. In this paper, we propose an optimization algorithm that can search for good solutions to CFD optimization problems exactly. We have applied the algorithm to the optimization of the shape of a sprue for die casting at an actual plant.