Editing Lees-Edwards boundary conditions

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'''Lees-Edwards boundary conditions''' are an adaptation of standard [[periodic boundary conditions]] for [[Molecular dynamics | molecular dynamics  simulations]]  of [[Stress |shear]] flow <ref>[http://dx.doi.org/10.1088/0022-3719/5/15/006 A. W. Lees and S. F. Edwards "The computer study of transport processes under extreme conditions", Journal of Physics C: Solid State Physics '''5''' pp. 1921- (1972)]</ref>. These boundary conditions provide a shear by giving each periodic domain a velocity proportional to the domain's vertical position compared to the center domain. Lees-Edwards BCs typically generate a simple shear flow velocity profile where the local average velocity (within the center periodic domain) is directly proportion to the vertical position. (v_x is directly proportional to y)
'''Lees-Edwards boundary conditions''' are an adaptation of standard [[periodic boundary conditions]] for [[Molecular dynamics | molecular dynamics  simulations]]  of [[Stress |shear]] flow <ref>[http://dx.doi.org/10.1088/0022-3719/5/15/006 A. W. Lees and S. F. Edwards "The computer study of transport processes under extreme conditions", Journal of Physics C: Solid State Physics '''5''' pp. 1921- (1972)]</ref>. They are convenient for e.g. simulations of [[Couette flow]].


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