Figure 6From: Optimal control of buoyancy-driven liquid steel stirring modeled with single-phase Navier–Stokes equationsOptimization of gas flow rates. Optimal gas flow rates for level 3, \(\Delta t =0.025\), different objective functionals, and different parameters λ. The frequencies correspond to the values given in Table 5: blue: nozzle 1; red: nozzle 2Back to article page