Free Surface DynamicsΒΆ

Model set-up
Start the M-Star Pre-Processor via Windows Start Menu
Build -> Define Outer Geometry
Choose: Cylindrical Tank
Specify tank diameter: 1.0 m
Specify tank side wall height: 1.0 m
Specify bottom shape: Dish
Specify floor depth: 0.1 m
Specify baffle count: 2
Specify baffle length: 0.05 m
Specify fluid height: 0.6 m
Specify head space: 0.1 m
Pre-Process -> Define Moving Geometry
Choose: Pitch Blade Impeller
Specify impeller diameter: 0.35 m
Specify shaft length: 0 m
Specify blade angle: 45 degrees
Specify impeller speed: 120 RPM
Specify impeller start-up ramp: 0 s
Specifying a head space greater than zero activates the free surface algorithm
The head space only needs to be large enough to capture sloshing.
The system here is intentionally under-baffled
Select the Simulation Component
Specify Resolution on Reference Length: 120
Specify runtime: 60 s
Specify CheckPointInterval: 10 s
Specify data output: 0.05 s
Specify slice output: 0.1 s
Specify volume output: 1 s
Tip
For low tip speed systems (<2 m/s), a smaller timestep may be required to maintain interface stability. Adjust the timestep by lowering the Courant number to 0.075. The default value for closed systems is 0.1. For more information regarding the Courant number see the simulation parameters section
Model Execution
Solve -> Run Solver
Choose an appropriate output location
Specify an appropriate number of cores
File -> Save As
Save your model with an appropriate name as a .3dm file
Model Post Processing
Start M-Star Post via Windows Start Menu
Browse to your output directory
Open the slices.txt in ParaView
Press the MStarPost button.
Press the play button to animate the sequence
The interface is illurated as an STL, which can be colored and rendered per user need.
Tip
Consider changing Background Color in the properties window to white. This can make saved images and movies more visually appealing and well suited for distribution on a variety of mediums.