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Bridge Pillars External Two-Phase Flow CFD Simulation

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In this project, a two-phase flow of air and water around a bridge’s pillars is investigated.

 

This ANSYS Fluent project includes CFD simulation files and a training movie.

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Description

Introduction

Analysis of the effects of fluid flow on rigid bodies is one of the most important applications of fluid mechanics. Effects such as corrosion, cavitation, oxidation, etc. are among the most important effects that the fluid flows have on the surfaces of the surrounding objects. The foundations of bridges are also exposed to scouring due to constant contact with river water. Due to this reason, the design and structure of the bridge pillars are very important in examining the scour of the bridge foundations.

Project description

In this project, a two-phase flow of air and water around a bridge’s pillars is investigated. The simulation is done using the VOF model for the two phases of air and water. Standard k-e model with the use of standard wall functions is also applied for solving the turbulent flow.

Geometry and Mesh

The geometry for analyzing this simulation consists of a fluid domain and two bridge pillars that are placed in a row relative to the flow direction so that the effect of the first pillar on the second pillar of the bridge can be simulated and analyzed. Geometry is designed in ANSYS design modeler® and is meshed in ANSYS meshing®. The mesh type used for this geometry is structured and the element number is 415860.

bridge

bridge

CFD Simulation settings

The key assumptions considered in this project are:

  • Simulation is done using pressure-based solver.
  • The present simulation and its results are considered to be steady and do not change as a function time.
  • The effect of gravity has been taken into account and is equal to -9.81 m/s2 in Y direction.

The applied settings are summarized in the following table.

 
(Bridge Pillar) Models
Viscous model k-epsilon
k-epsilon model standard
near wall treatment standard wall function
Multi phase VOF
Phase 1 Air
Phase 2 Water
(Bridge Pillar) Boundary conditions
Inlets velocity inlet
 

Water inlet

velocity 0.25 m/s
Turbulent intensity 3.999999910593 %
Hydraulic diameter 0.3 m
Outlets Pressure outlet
Walls
wall motion stationary wall
(Bridge Pillar) Solution Methods
Pressure-velocity coupling Simple
Spatial discretization pressure PRESTO!
Volume fraction first order upwind
momentum second order upwind
turbulent kinetic energy first order upwind
turbulent dissipation rate first order upwind
(Bridge Pillar) Initialization
Initialization method   Standard
gauge pressure 0 Pa
velocity (x,y,z) 0 m/s-1
Turbulent kinetic energy 1 m2/s2
Turbulent dissipation rate 1 m2/s3
Water volume fraction 0

Results

At the end of the solution, we present contours of pressure, velocity, streamlines and volume fractions of air and water phases.

 

All files, including Geometry, Mesh, Case & Data, are available in Simulation File. By the way, Training File presents how to solve the problem and extract all desired results.

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