We use the Brownian dynamics with hydrodynamic interactions simulation in order to describe
the movement of an elastically coupled dimer Brownian motor in a ratchet potential. The only external
forces considered in our system were the load, the random thermal noise and an unbiased
thermal fluctuation. We observe differences in the dynamic behaviour if hydrodynamic interactions
are considered as compared with the case without them. In conclusion, hydrodynamic interactions
influence substantially the dynamics of a ratchet dimer Brownian motor; consequently
they have to be considered in any theory where the molecular motors are in a liquid medium.
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