CFD Based Investigation of Boundary Layer Separation Control for Y-intake Duct Adapter by Various Degrees of Height Roughness


Fatimah M. Mohsen* , Hameed k. Hamzah, Dhragham A.Alkhafaji


Department of Mechanical Engineering, Collage of engineering, University of Babylon, Iraq.

Corresponding Author Email: faimahmalek@gmail.com

This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

The flow characteristics of an air-Y-shaped intake duct adapter are discussed in this paper. The chosen duct has an actual subsection geometry of 45°, 50°, 55°from the rectangular cross section, with the adjustment of the flow being introduced. Computational investigations were conducted with three types of surface roughness (1e-12 m. 0.001 m, 0.002 m) and 4.5 m/s, 5.5 m/s and 6.5 m/s, 7.5 (speed spectrum used in the blower applications). This research paper aims to study the effects of controlling the separation of the boundary layer by reducing the surface roughness in the area with varying velocity ratios and adjusting to a 2D Y-intake duct at different angles. The study aims to concentrate on the changes in the duct’s flow characteristics and identify the best velocity possible. Using the compressible, Reynolds Averaged Navier Stokes equation with the RNG k-ε one equation turbulence model, the modeling and analysis was carried out. For the two different degrees of height roughness, the velocity profiles and pressure at different positions on the suction surface were plotted. With the increase in roughness height, the shear stress distribution is found to have been increased. The highest improvement in output was achieved when (A=1e-12 m) by increasing Pressure Coefficient 𝐶𝑃, and the least improvement was achieved when (A=0.002 m). The quantitative observations of velocity profiles and pressure distribution are also accompanied by the qualitative results of span-wise flow contours.