Here we saw that the sublinear regime of W 2/3 appears. Note that the theoretical results of this section could not be verified by MD simulations because the MD simulations with hydrodynamics interactions suffers from a high instability. Polymer brush bilayers under non-equilibrium shear inversion One of the most interesting situations that occur in synovial joints of mammals, is the shear inversion of brush bilayers. This motion throws the system completely out of equilibrium and we can tackle it by MD simulations. The shear inversion protocol is given as follows,