Another meshing technique to simplify the simulation is using Overset Mesh, which is cell-to-cell mappings between multiple disconnected mesh regions.
This allows complex mesh geometry and motion without deforming the mesh discussed in the previous chapter; deforming mesh is often very prone to mesh quality problems, which leads to divergence.
Figure 3.16. Overset Mesh
Both dynamic and overset Mesh are possible to perform a 6-degree of freedom (6 DOF) modeling. This involves dynamic mesh movement that depends on the forces generated on the surface. For instance, a turbine subjected to a flow will rotate at a specific speed as its output.
Additionally, we can consider the effects of inertia (both mass and rotational inertia moments) to observe the dynamic response of an object. For example, the motion of a ship’s hull in response to water waves.
Figure 2.17 shows an example of floating box motion on a free surface using 6 DOF overset mesh modeling.
Figure 3.17. Floating body motion using an overset mesh with OpenFOAM
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