The purpose of this project is just helps you to set a CFD simulation with a rotating body and analyse the turbulence acting on the fluid due to the moviment. Here 3 different types of boxes will aim to analyse the splash effect when turning a milk carton. This effect occurs because the liquid outlet is the same place that the air intake in the carton (box).
The CAD models was designed by the author and uploaded in STEP format.
Figure 1: Gemetries
Hex-dominant parametric algorithm with 3 reffinements in different surfaces.
Figure 2: Meshes
Each package has the capacity to store in avarage 1 [L]
Start vetically with stationary state until 120 degrees
Was considered 1 [s] to reach the maximum angulation
Multiphase flow: Milk + Air (Euler)
Milk: Kinematic viscosity [m²/s] = 9.669e-7, Density [kg/m³] = 1035
Constant phisical properties
Transient simulation (Time-step length: 0.005 s)
Total analysis: 3 seconds
- Residuals under 10e-3
- CourantMax Avarage is 2,1
The geometry 1 (Box 1) was the highest pressure overall, the second is the Box 2, and the lowest pressure is acting in Box 3. These results explains the rowdy flow in each box, being that the turbulence in Box 2 is pretty similar when you compare with Box 1. Therefore, because it has the smaller pressure, the Box 3 is the most recomended if you want to minimize the splash effect of the fluid.
Figure 3: Pressure in the packages in the maximum angulation (120 degrees).
Figure 4: Pressure over the cells in the top of packages in the maximum angulation (120 degrees).
Figure 5: Turbulence in the fluid outlet / air inlet for each box.
Figure 6: Turbulence in the center of the fluid outlet / air inlet (Slice).