11

2D CFD-Simulation Example with Fluent

1. Turbulent flow in a manifold (Pag. 2) 2. Laminar flow in a manifold (Pag. 25)

Prepared by Dr. Over DíazCESMarch 2007

22

Turbulent Flow in Manifold(By considering only input velocities)

33

1. Data

OuletFluid : waterDensity = 998.2 kg/m3Dynamic viscosity = 0.001003 kg/m.sThe flow is turbulentRe ≈ 1x106

Fig. Manifold with 4 inlet pipes and 1 outlet pipe

Inlet 1V=1m/s

Inlet 2V=1m/s

Inlet 3V=1m/s

Inlet 4V=1m/s

44

Manifold geometry2 m

6 m2 m

4 m

1 m 1 m

7 m

55

Mesh generation with Gambit

Fig. Triangular mesh created with Gambit

66

Define Solver and Viscous Model

77

Define Fluid

88

Define Operating Conditions

99

Define Boundary Conditions

1010

1111

1212

1313

1414

1515

1616

Solve control solutions

1717

Solve Solution Initialization and Residual Monitors

1818

Solve Iteration

1919

Convergence of solution

2020

Display of Vectors – Velocity Magnitude

2121

Display of Vectors – Velocity Magnitude

2222

Display of Contours – Velocity Magnitude

2323

Display of Contours - Vorticity

2424

Display of Contours – Dynamic Head

2525

Laminar Flow in Manifold(By considering only input velocities)

2626

1. Data

OuletFluid : waterDensity = 998.2 kg/m3Dynamic viscosity = 0.001003 kg/m.sThe flow is laminarRe ≈ 100 ( at inlet)

Fig. Manifold with 4 inlet pipes and 1 outlet pipe

Inlet 1V=0.0001m/s

Inlet 2V=0.0001m/s

Inlet 3V=0.0001m/s

Inlet 4V=0.0001 m/s

2727

Manifold geometry2 m

6 m2 m

4 m

1 m 1 m

7 m

2828

Mesh generation with Gambit

Fig. Triangular mesh created with Gambit

2929

Define Solver and Viscous Model

3030

Define Fluid

3131

Define Operating Conditions

3232

Define Boundary Conditions

3333

3434

3535

3636

3737

3838

3939

Solve control solutions

4040

Solve Solution Initialization and Residual Monitors

4141

Solve Iteration

4242

Convergence of solution

4343

Display of Contours – Velocity Magnitude

4444

Display of Contours – Dynamic Head

4545

Display of Vectors – Velocity Magnitude