  We have designed 3D numerical simulations of a soft spheres model, with size
polidispersity and in athermal conditions, to study the transient shear banding
that occurs during yielding of jammed soft solids. We analyze the effects of
different types of drag coefficients used in the simulations and compare the
results obtained using Lees-Edwards periodic boundary conditions with the case
in which the same model solid is confined between two walls. The specific
damping mechanism and the different boundary conditions indeed modify the load
curves and the velocity profiles in the transient regime. Nevertheless, we find
that the presence of a stress-overshoot and of a related transient banding
phenomenon for large enough samples are a robust feature for overdamped
systems, where their presence do not depend on the specific drag used and on
the different boundary conditions.
