Creation of the shear flow and the stretching of the initial poloidal field into toroidal field with time. Shown are (x, y)‐planes at depth ﹩z=z_{v}﹩ from case M1 at times ﹩t=0.70﹩, 1.40, 4.12. The left‐hand panels show vector arrows of the (u, ﹩v﹩) flow field, exhibiting the buildup of u toward the target velocity. The right‐hand panels show magnetic field lines being stretched from their initial y‐direction (poloidal) into the x‐direction (toroidal) by the action of the building velocity shear.