Item description

Simulation of Two-phase flow around pier (bridge truss) in Ansys Fluent

Analysis of the effects of fluid flow on rigid bodies is one of the most important applications of fluid mechanics. Corrosion, cavitation, oxidation,…. are the most important effects of fluid flow on the surface of these bodies. Because of perpetual contact with the water, the piers are also susceptible to water-worn. In this project tried to analyzed and simulate two-phase flow around the bridge truss by ANSYS.

Geometry and meshing

The required geometry has been designed by ANSYS modeling. The solution domain has been generated for the size of bridge trusses. Mesh grid has also been generated by ANSYS meshing. All of the cell numbers is 415860.

Used model and method of solution

For analysis and simulation the effects of the first pier on the second pier, two piers of the bridge are tandem and in direction of flow. According to flow turbulence as well as the effect of one of the piers at the flow that is in contact with the other one, the k-epsilon RNG turbulence model has been used. The VOF two-phase model has also been used for analyzing the multiphase state of this project. The simple algorithm has also been used for equation solution.

The pressure-based solver has been used in this analysis and the gravity of the earth, is also considered.

Boundary conditions

Entry of fluid flow is consists of two-parts, one of them is related to air, and the other one is related to water. Boundary condition for air is pressure-inlet, and for water is velocity-inlet which is the velocity of the water(0.25 m/s). Boundary of the top of the domain is also assumed symmetry.

The results have been shown in the form of streamlines, pressure, phase and velocity contours.

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