Purcell magneto-elastic swimmer controlled by an external magnetic field
  This paper focuses on the mechanism of propulsion of a Purcell swimmer whose segments are magnetized and react to an external magnetic field applied into the fluid. By an asymptotic analysis, we prove that it is possible to steer the swimmer along a chosen direction when the control functions are prescribed as an oscillating field. Moreover, we discuss what are the main obstructions to overcome in order to get classical controllability result for this system. 
Fran\c{c}ois Alouges (CMAP), Antonio Desimone (SISSA / ISAS), Laetitia   Giraldi (McTAO), Marta Zoppello
math.DS math.OC