(Engineering Mechanics, Vol. 14, 2007, No. 6, pp. 387-397)
The aim of this work was to model numerically the flow phenomena occurring in turbulent flows through curved diffusers of the rectangular cross-section. All investigated diffusers have the cylindrical inner wall, the area ratio 1.5 and the flow turn angle 90°. They differ in the ratio of the inner wall radius and the diffuser height. Calculations were carried out for various inlet velocities resulting in the Reynolds numbers approximately in the range of 1 x 105 – 1 X 106. The ANSYS CFX package was used, employing both the k-ω /k-ε: SST turbulence model by Menter and the RSM model by Launder, Reece and Rodi. Structured mono-block grids refined in the regions with high velocity gradients were used, representing a numbers of nodes from 1.4 mil. to 1.8 mil. grid points.
Turbulent flow in curved diffuser, CFD analysis, 3D separation, Secondary flows, Skin-friction lines
