Twelve red blood cells in a microchannel with no constriction:

• The length of the channel is 120 microns and its height is 30 microns.
• The flow is periodic in the horizontal direction.
• The height (resp. width) of the narrow part is 15 microns (resp., 40 microns).
• The diameter of cells = 7.65 microns and the thickness of cells = 1.986 microns.
• The density of fluid is 1 and the viscosity of the fluid is 0.012.
• The averaged speed at t=60 ms in the channel is 1.661 cm/sec (Re=0.415).
• The histories of the mass centers of twelve cells are shown as follows: