A strong vertical vortex penetrating the optical surface in Run H. The nine panels at the top show, at various stages of development, the velocity (left panels) and gas pressure (middle panels) at the average height of the optical surface (z = 0) together with a bolometric intensity map (right panels). The line plots at the bottom left represent one-dimensional cuts through the vortex at the last instant (t = 126   s). The 3D visualization at the bottom right shows, from two different viewing angles, selected streamlines color coded by velocity and the warped optical surface in yellow; the black rectangle indicates the z = 0 plane.