2D distribution of magnetic field lines overlaid on contours of the radial plasma speed, V_r (km s⁻¹), illustrated on meridional planes spanning from 1 to 20 R_s and perpendicular to the STEREO-A line of sight (a, b, and c), and 3D distribution of magnetic field lines (d) at the 82nd hour of the time-evolving simulation. Panel a shows the results of the quasi-steady-state simulation, panels b and c present the time-evolving simulation results at the 82nd and 735th hours, respectively, and panel d the 3D distribution of some selected magnetic field lines. The evolution of these selected magnetic field lines is shown in online movie 2.