Abstract
Turbulent characteristics of a reattached flow separated from a rib ahead of a backward-facing step in a flat air channel were numerically analyzed by RANS and LES methods. The separation region ended just before the step edge. The both methods showed low pressure regions in corners, formed by the rib and the channel walls that caused a vorticity tube forming along the rib. Nevertheless in RANS, a separated flow was identified as two-dimensional with a thicker shear layer at the step edge. In LES, the low pressure regions caused both redistributions between velocity components, Reynolds stresses, and a thicker shear layer at the step edge. The flow structure behind the rib has been, thus, identified as three-dimensional.
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