Numerical Simulation of a Two-Dimensional Channel with a Raised Bottom: Comparison of a Curved Surface with a Sharp Surface

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Barzigar Amirhossein; Ebadati Erfan; Hosseinalipoor Seyed Mostafa

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Journal Paper

Paper Information

Journal: Modares Mechanical Engineering Year:2025 | Volume:25 | Issue:6 Page(s): 373-386

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Information Journal Paper

Title

Numerical Simulation of a Two-Dimensional Channel with a Raised Bottom: Comparison of a Curved Surface with a Sharp Surface

Author(s)

Barzigar Amirhossein | Ebadati Erfan | Hosseinalipoor Seyed Mostafa | Issue Writer Certificate

Keywords

Flow Shock

Supersonic Flow

Protrusion

Pressure Gradient

Abstract

This study presents a comprehensive numerical investigation of compressible fluid flow in a two-dimensional channel featuring curved and triangular Protrusions on the channel floor, under subsonic and Supersonic Flow conditions. Geometry and mesh generation were carried out using Gambit, while numerical simulations were performed using Fluent. The k-ω SST turbulence model, along with a density-based implicit solver, was employed to simulate the flow at inlet Mach numbers of 0.5, 0.675, and 1.4. The results revealed significant variations in pressure and Mach number along the channel, directly influenced by the Protrusion geometry and flow regime. At Mach 0.5, the pressure at the leading edge of the curved Protrusion increased up to 1.2 times the inlet pressure, while the Mach number dropped to 0.43. At Mach 0.675, the pressure rose to 1.4 times the inlet value, with the Mach number decreasing to 0.6. Under supersonic conditions (Mach 1.4), shock wave formation was clearly observed, accompanied by a pressure drop to 0.75 and an increase in Mach number to 1.5 downstream. Triangular Protrusions induced stronger disturbances in flow characteristics compared to curved ones, leading to the formation of more intense shocks and steeper Pressure Gradients. Velocity vectors and streamlines indicated shock concentration near the Protrusions. The k-ω SST model effectively captured these behaviors. The findings are significant for optimizing aerodynamic performance in engineering systems such as turbomachinery, nozzles, and fluid transport ducts, highlighting the influence of geometry on phenomena such as shock formation, energy loss, and pressure recovery

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