Setting up Problem in FLUENT
With mesh created, we can now use FLUENT to set up the problem. Following steps illustrate what is needed to be done.
- Import generated mesh file
- Define turbulence model
- Different turbulence model are appropriate for different flow properties
- K-ε realizable model is chosen for the flow in flocculation tank (further discussed in later section)
- Define materials (liquid water for our case)
- Define operating conditions (use default operating pressure)
- Define boundary conditions (Details below)
- Set control solution
- Select second order discretization method instead of first order method
- Initialize the problem with the inlet properties
- Set Residual to 1e-05
- The residual is a measure of how well the current solution satisfies the discrete form of each governing equation
- Solve the problem by iterating
Defining Boundary Conditions
Figure 1. Boundary conditions of flocculation tank
Figure 1 shows the boundary conditions of the flocculation tank. The top part of the flocculation is open, so a symmetry boundary conditions is employed. Set the inlet boundary condition to inlet velocity of 0.1 m/s. Outlet condition is set to pressure outlet.
Table 1. Boundary conditions
Boundary |
Boundary Conditions |
---|---|
Top |
Symmetry |
Wall |
Wall |
Inlet |
Velocity Inlet (0.1m/s) |
Outlet |
Pressure Outlet |