Velocity magnitude (left panels) and deviations of the hydrogen mass fraction from its angulary averaged value X′(x, y) = X(x, y)−⟨X⟩(r) (right panels) of simulation H3.5, H3.5-ov1.7, and H3.5-ov3.0 (from top to bottom) after 2 10⁷ s. The magenta dashed circles mark the initial size of the mixed core, while the black dashed circles show the size of the convective core according to the Schwarzschild criterion. The streamlines in the left panels indicate the flow direction.