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Sludge Flow Settling in a Pipe, Ansys Fluent Training

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In this project, Sludge Flow Settling in a 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

Sludge Flow Project Description

The goal of this project is to simulate sludge flow settling in a pipe by Ansys Fluent software. The Eulerian VOF model has been used. The water is entering the domain with the speed of 0.01 m/s with gravity considered -9.81 m/s-2 on the y-axis.

Geometry & Mesh

The 2-D geometry of the present model is carried out using Design Modeler software. The geometry consists two-section, the lower section is resident water, and the upper section contains outlet and velocity inlet; tank sides are considering as well.

Sludge Flow

The meshing of this present model has been generated by Ansys Meshing software. The mesh grid is unstructured with no element quality lower than 0.52, and the total cell number is 390742.

Sludge Flow

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-omega Viscous model
SST k-omega model
shear flow corrections k-omega options
Water primary phase
sludge secondary phase
explicit formulation
Boundary conditions
Velocity-inlet Inlet
0 initial gauge pressure Mixture
0.01 m/s velocity magnitude sludge
0.1 volume fraction
Pressure outlet outlet
1 backflow volume fraction sludge
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
0.01 m/s water velocity (0,y,0)
0.01 m/s sludge velocity (x,y,z)
0.1 the secondary phase volume fraction

Results

At the end of the solution process, two-dimensional and velocity, sludge and water volume fraction, and animation are obtained. This 2-D simulation starts with pipe fill with sludge and water as a mixture; as time passes, sludge settles in U shape pipe bottom, and water continues to flow through the pipe.

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

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