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Slug Flow, Ansys Fluent CFD Simulation Training

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In this project, slug flow in the pipe has been simulated and the results of this simulation have been investigated.

This product includes Geometry & Mesh file and a comprehensive Training Movie.
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Description

Project Description

The goal of this project is to simulate slug flow in a pipe by Ansys Fluent Software. There is a multiphase-flow regime in tubes in which most of the lighter fluid is contained in large bubbles dispersed within and pushing along the heavier fluid. The word slug refers typically to the more severe and slower-moving fluid but sometimes to the bubbles of lighter fluid. There are also tiny bubbles within the liquid, but many of them coalesced to form the large bubbles until they span much of the pipe. In gas-liquid mixtures, slug flow is similar to plug flow, but the bubbles are generally more giant and faster. The Eulerian VOF model has been used. The mixture is entering the domain with the speed of 0.6 m/s with gravity considered -9.81 m/s-2 on the y-axis.

Geometry & Mesh

The 3-D geometry of the present model is carried out using Design Modeler software.

Slug Flow

The meshing of this present model has been generated by ANSYS Meshing software. The mesh grid is unstructured, and the total cell number is 1148302.

Mr CFD

CFD Simulation

To simulate the present model, several assumptions are considered, which are:

  • The solver is pressure-based.
  • Simulation has only examined fluid behavior; in other words, heat transfer simulation has not been performed.
  • The effect of gravity on the flow is considered to be 9.81 m.s-2 and along with the y-axis in the present model.

The following is a summary of the steps for defining the problem and its solution

Models
K-epsilon Viscous model
Realizable k-epsilon model
Scalable  wall function k-epsilon options
air primary phase
water secondary phase
explicit formulation
Boundary conditions
Air Velocity-inlet Inlet
0 initial gauge pressure Mixture
0.6 m/s velocity magnitude water
0 volume fraction
water Velocity-inlet Inlet
0 initial gauge pressure Mixture
0.6 m/s velocity magnitude water
1 volume fraction
Pressure outlet outlet
1 backflow volume fraction air
0 backflow volume fraction Water
wall Wall
stationary wall wall motion
Solution Methods
Phase coupled pressure-velocity coupling
PRESTO! pressure
first-order upwind momentum
first-order upwind specific dissipation rate
first-order upwind volume fraction
Initialization
standard initialization method
0.6 m/s water velocity (0,y,0)
0.6 m/s air velocity (x,y,z)

Results

At the end of the solution process, three-dimensional and velocity, air and water volume fraction, and animation are obtained. This 3-D simulation starts with a pipe filled with air and water as a mixture. As time passes, air bubbles join together and make slugs because of the lower air density than water. The air slug moves up the surface of the pipe and continues to move forward outlet.

You can obtain Geometry & Mesh file and a comprehensive Training Movie that presents how to solve the problem and extract all desired results.

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