Abstract
The developing laminar flow in a curved square channel was solved by using a finite-difference approximation adopted for the time dependent three dimensional N-S equation in toroidal coordinates. The channel consists of a 180° bend with curvature ratio 4, an inlet length of 5 hydraulic diameter and at the outlet 55 hydraulic diameter. The Reynolds number employed is 500.
Effects of diffusion term in the main flow direction observed are : a shift of incoming flow towards the inner wall at the beginning of curvature, and deadly retarded main flow appeared firstly near the corner of the outer wall, then secondary at the central region adjacent to the inner wall of the curved channel.
