Abstract
Two-dimensional (2D) numerical simulations of flow over wall-mounted rectangular and trapezoidal ribs subjected to a turbulent boundary layer flow with the normalized boundary layer thickness of δ/D = 0.73,1.96,2.52 (D is the height of the ribs) have been carried out by using the Reynolds-averaged Navier-Stokes (RANS) equations combined with the k – ω SST (Shear Stress Transport) turbulence model. The angles of the two side slopes of trapezoidal rib varies from 0° to 60°. The Reynolds number based on the free-stream velocity U ∞ and D are 1 × 106 and 2 × 106. The results obtained from the present numerical simulations are in good agreement with the published experimental data. Furthermore, the effects of the angle of the two side slopes of the trapezoidal ribs, the Reynolds number and the boundary layer thickness on the hydrodynamic quantities are discussed.
Highlights
Investigations on turbulent flow over wall-mounted, sharp-edged ribs are of great importance due to their wide applications in industries such as gas turbines, heat exchangers and subsea covers for pipelines and other subsea equipment
Two-dimensional (2D) numerical simulations of flow over wall-mounted rectangular and trapezoidal ribs subjected to a turbulent boundary layer flow with the normalized boundary layer thickness of δδ⁄DD = 0.73, 1.96, 2.52 (DD is the height of the ribs) have been carried out by using the Reynolds-averaged Navier-Stokes (RANS) equations combined with the kk − ωω SST (Shear Stress Transport) turbulence model
Unlike the problems of flow around circular cylinders, the separation point of the flow is fixed at the leading corner of the rib structures and the presence of the wall can suppress the vortex shedding behind the rib structures
Summary
Investigations on turbulent flow over wall-mounted, sharp-edged ribs are of great importance due to their wide applications in industries such as gas turbines, heat exchangers and subsea covers for pipelines and other subsea equipment. The hydrodynamic quantities of the flow over wall-mounted rectangular and trapezoidal ribs are obtained by using 2D numerical simulations. Arie et al (1975) carried out experiments to investigate the pressure distribution around a wall-mounted square rib structure subjected to a turbulent boundary layer at Reynolds numbers ranges from 3.14 × to 1.19 × and it was found that the drag coefficient on the square decreases with the increasing boundary layer thickness. Yin et al (2020) used 2D RANS simulations to study the boundary layer flow over two wall-mounted structures with square and trapezoidal shape in tandem on a horizontal flat wall and investigated the effects of the gap ratio between the two structures on the surrounding flow fields.
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