Bridge Pillars External Two-Phase Flow CFD Simulation, ANSYS Fluent Training
Price: Free
- The problem numerically simulates the Bridge Pillars External Two-Phase Flow using ANSYS Fluent software.
- The 3-D geometry is designed in Design Modeler software.
- We used ANSYS Meshing to generate mesh; the element number equals 270,812.
- Two phase flow (air and water as first and second phase respectively) is simulateed using VOF model.
- Turbulent flow is modeled with RNG k-epsilon model.
Bridge Pillars External Two-Phase Flow CFD Simulation, ANSYS Fluent Training
Price: Free
- The problem numerically simulates the Bridge Pillars External Two-Phase Flow using ANSYS Fluent software.
- The 3-D geometry is designed in Design Modeler software.
- We used ANSYS Meshing to generate mesh; the element number equals 270,812.
- Two phase flow (air and water as first and second phase respectively) is simulateed using VOF model.
- Turbulent flow is modeled with RNG k-epsilon model.
Description
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 essential in examining the scour of the bridge foundations.
In this project, Bridge Pillars External Two-Phase Flow CFD Simulation, the flow of air and water around a bridge's pillars is investigated by ANSYS Fluent software. The simulation uses the VOF model for the two phases of air and water. The RNG k-e model using standard wall functions is also applied to solve the turbulent flow.
The geometry for analyzing this simulation consists of a fluid domain and two bridge pillars placed in a row relative to the flow direction so that the first pillar's effect on the bridge's second pillar can be simulated and analyzed.
Geometry is designed in ANSYS design modeler and is meshed in ANSYS meshing and the element number is 415,860.
Bridge Pillars External Two-Phase Flow Methodology
In this project, a two-phase flow of air and water around a bridge's pillars is simulated with the VOF model, in which the first phase is air and the second is water. We found the RNG k-e model practical to model the flow's turbulence.
The present simulation and its results are considered to be steady and do not change as a function of time, and the effect of gravity has been taken into account. Also, the solver is pressure based.
Conclusion
At the end of the solution, we present contours of pressure, velocity, streamlines, and volume fractions of air and water phases. For instance, the velocity and air volume fraction streamlines can help us to understand the flow behavior along the domain.
The water flows around the pillars, creating vortices and eddies, and the air flows over the top of the pillars, creating a boundary layer. The water and air interact, creating a mixing layer creating turbulence. Vortices and eddies are stronger near the pillars, where the flow is more turbulent. Also, the mixing layer created by the interaction of the water and air is thicker.