Simulations of the Biermann battery mechanism in two-fluid partially ionised plasmas

In the absence of an initial seed, Biermann battery term a non-ideal induction equation acts as source that generates weak magnetic fields. These fields are then amplified via dynamo mechanism. The Kelvin-Helmholtz instability is fluid phenomenon takes place in many astrophysical scenarios and can trigger action processes. We aim to investigate effect ionisation degree plasma interaction between charged neutral species have on generation amplification during different stages instability. use two-fluid model implemented numerical code Mancha-2F. perform 2D simulations starting from configuration with no field which unstable due velocity shear. vary we analyse role collisional terms included equations play evolution field. find when coupling considered two fluids, mechanism does not depend degree. However, elastic collisions taken into account, increased reduced. This behaviour slightly enhanced if process charge-exchange also considered. dependence total density related fluids. As increased, results converge predictions single-fluid models.