Hi Everyone,

There has been some interest in modeling the filling process of fluids inside cavities, whether it is a mold-flow problem or filling of a bottle with liquid and I thought I would demonstrate one such example using CEL.

In this example. the CEL approach is used to simulate the filling process of a bottle used to fill a vial with fluid. The splashing of fluid that occurs during the filling process is sought as the bottle is filled with liquid. The geometry of the bottle along with dimensions (in cm) are shown here:

The bottle is filled with liquid having properties that of water (density=0.001 kg/cc, viscosity=1.0 cP and speed of sound = 150000 cm/s). The bottle is filled in a total time of 1 second. The grid consists of a total of 83270 elements with 90 elements along the height of the bottle and 40 elements across the width of the bottle). A schematic of the mesh is shown below:

The bottle is filled using a fill rate of 33.3 ml/sec and is ramped from 0 to 33.3 ml/sec over the first 0.1 sec, held at this rate for 0.8 sec and then ramped back to 0 over the last 0.1 sec. The filling profile is shown in figure below.

The filling is accomplished from the top by assigning a velocity BC to the top surface with a layer of elements providing the initial material (liquid) level. In addition a uniform gravity load is applied in the negative y-direction to the entire model. Results show an initial splashing when the liquid comes into contact with the bottom surface and then stabilizes and fills the bottle. Animation of the bottle filling is shown here