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Building the Mesh

The mesh for the computational domain is created using the Marine Template Mesher.

The steps involved in the meshing are:

  1. Select the Marine Template Mesher in the Mesh Panel
  2. Enter marine for the Mesh Name in the Properties Panel > Geometry Tab.
  3. Select Normal Mode or Advanced Mode for the Setup Options drop-down list. Select Advanced Mode to add a refinement zone in mesh.
  4. Select Displacement for the Hull Type drop-down list.
  5. Select Normal, Coarse, Fine for the Mesh Size drop-down list . Select User Defined to enable the advanced mesh possibilities, which is discussed in Advanced Meshing.
  6. Select the CAD Surfaces entity hull in the Geometric Entities Panel, click Add Surfaces icon for Hull in the Properties Panel. Similarly, select CAD Surfaces entity deck, click Add Surfaces icon for Deck respectively.

  7. Click Build Marine Template Mesher Mesh to create a well resolved mesh for the computational domain. A new mesh marine is created under Built Meshes in the Geometric Entities Panel.
 

Figure 8.19 - Marine mesh settings

Advanced Meshing

User Defined settings under Mesh Size in the Marine Template Mesher are used to control the advanced mesh features.

Wave Zone meshing

The wave zone meshing allows refinement of the wave zone to model and capture the Kelvin wave region in the marine simulation.

The wave zone for the refinement is specified using the following:

  • Wave Zone Reference Position: The width at ship front, . The length is relative to ship max dimension.
  • Wave Zone Angle: The angle of wave zone, , should be bigger than Kelvin angle (19.5°).
  • Wave Zone Height: The height of wave zone, relative to ship height.
  • Wave Zone Front: The forward end of wave zone, , relative to ship length.

  • Wave Zone Back: The aft end of wave zone, , relative to ship length.

Once the wave zone is built, the following settings are described for the refinement.

Cell Size of Wave Zone: The minimum domain cell size of wave zone.

Total Levels of Refinements in Wave Zone: The total number of levels of refinement to transient from minimum domain cell size to maximum domain cell size.

 

Figure 8.20 - Wave zone

 

Global Mesh Refinement

The global meshing settings allow refinement of the mesh sizes of the computational domain in the marine Computational Fluid Dynamics (CFD) simulation.

  • The settings are similar to the mesh setting of the General Mesher except the presence of additional settings for the surface of the hull.
  • Cell Size on Hull Boundaries: Used to control the size of the boundary cells generated next to the hull surface. No boundary cell at the selected surface can have a cell side larger than the corresponding Cell Size on Boundaries.
  • Min. Cell Refinement on Hull Boundaries: Specifies the total number of levels of refinement to transient from minimum domain cell size to maximum domain cell size on the hull boundary.
 

Figure 8.21 - Advanced meshing options

 

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