Flow of tracers in the far field of a steadily moving object

Tracer particles immersed in a fluid respond to the presence of a steadily moving object located far away from them—that is, the tracers are located in the "far field" relative to the object. The gray disk represents the "near/middle field", where the flow predictions made here are inaccurate.

The particles move in loop-de-loops as they avoid the object and then follow the motion of the object. All steadily moving immersed objects generate this flow perturbation sufficiently far from the object.

fluid dynamics,potential flow,far field flow,dipole flow,irrotational flow,physics,