The purpose of this tutorial is to provide guidelines and recommendations for setting up and solving a dynamic mesh (DM) case along with the six degree of freedom (6DOF) solver and the volume of fluid (VOF) multiphase model. The 6DOF UDF is used to calculate the motion of the moving body which also experiences a buoyancy force as it hits the water (modeled using the VOF model). Gravity and the buoyancy forces drive the motion of the body and the dynamic mesh This tutorial demonstrates how to do the following:
- Use the 6DOF solver to calculate motion of the moving body
- Use the VOF multiphase model to model the buoyancy force experienced by the moving body
- Set up and solve the dynamic mesh case
- Create TIFF files for graphic visualization of the solution
- Post-process the resulting data
This tutorial assumes that you are familiar with the menu structure in FLUENT and that you have a good understanding of the basic setup and solution procedures. Some basic steps in the setup and solution procedure will not be shown explicitly
The schematic of the problem is shown in Figure 1. The tank is partially filled with water. A box is dropped into the water at time t = 0. The box is subjected to a viscous drag force and a gravitational force. When the box is immersed in water, it is also subjected to a buoyancy force.
The walls of the box undergo a rigid body motion and will displace according to the calculation performed by the 6DOF solver. Whenever the box and its surrounding boundary layer mesh are displaced, the mesh outside of the boundary layer will be smoothed and/or re-meshed.