  Recently, it was found that a wedgelike microparticle (referred to as
"carrier") which is only allowed to translate but not to rotate exhibits a
directed translational motion along the wedge cusp if it is exposed to a bath
of microswimmers. Here we model this effect in detail by resolving the
microswimmers explicitly using interaction models with different degrees of
mutual alignment. Using computer simulations we study the impact of these
interactions on the transport efficiency of V-shaped carrier. We show that the
transport mechanisms itself strongly depends on the degree of alignment
embodied in the modelling of the individual swimmer dynamics. For weak
alignment, optimal carrier transport occurs in the turbulent microswimmer state
and is induced by swirl depletion inside the carrier. For strong aligning
interactions, optimal transport occurs already in the dilute regime and is
mediated by a polar cloud of swimmers in the carrier wake pushing the
wedge-particle forward. We also demonstrate that the optimal shape of the
carrier leading to maximal transport speed depends on the kind of interaction
model used.
