(a) Scheme for the outlet effect
(b) Scheme for the inlet effect
Figure 3: Illustration of the “truncation channel” schemes to study the end effects. and are the inlet and outlet pressures of the reference long channel. , , and are the local pressures on the reference channel where we may truncate the channel to form a new end. We assign , , or as the pressure boundary condition ( or ) to the new end of the truncated channel.