Preliminary step (geometry from standard layers)

Tdyn wizard helps you to easily generate control volume around body or bodies, assign the main data , generate a mesh and perform the simulation . Moreover, Tdyn wizard will help you in the post-processing and reporting the results.

Tdyn wizard can be accessed at any time through the menu option Data > Problem wizards > Tdyn ... .

To make the Tdyn wizard understand the problem, the geometry body has to be split in different layers as described in the following steps.

Layers split a drawing into separate pieces. Every entity can only belong to one single layer.

  1. body_wet layer: Surfaces of the body within the fluid have to be assigned to the body_wet layer.
  1. body_dry layer: Surfaces and lines of the body out of the fluid (if any) have to be assigned to the body_dry layer. If necessary, body surfaces may be split by the initial floating line. This layer will only be used in types 1 and 3 of the cases solved by the Tdyn wizard (see below).
  1. free_surf layer: Lines of the body (if any) belonging to the (initial) free surface (floating line) have to be assigned to the free_surf layer. If necessary, this line may be created by intersecting body surfaces with (initial) free surface. This layer will only be used in types 1 and 3 of the cases solved by the Tdyn wizard (see below).
  1. symm_oy layer: Lines of the body (if any) belonging to the symmetry plane (sym. plane must be of type y = yo ) and being below the floating line have to be assigned to the symm_oy layer. Note that only wet entities (those below free surface can be included in this layer). This layer will only be used in types 1 and 2 of the cases solved by the Tdyn wizard (see below).

Following are different cases of problems solved by the Tdyn Wizard:

Case 1. Semi-submerged floating body with free surface. Geometry and boundary conditions with symmetry in y=yo plane. Main flow in +x or -x direction. RANSOL and NAVAL modules required.

Case 2. Submerged body without free surface. Geometry and boundary conditions with symmetry in y=yo plane. Main flow in +x or -x direction. RANSOL module required.

Case 3. Semi-submerged floating body with free surface. Geometry and boundary conditions without symmetry. Main flow in +x or -x direction. RANSOL and NAVAL modules required

Case 4. Submerged body without free surface. Geometry and boundary conditions without symmetry. Main flow in +x or -x direction. RANSOL module required.

Figure 18 Tdyn Wizard cases.

Layers window can be accessed through the menu option Utilities>Layers .

Detailed information on how to create geometry can be found in the help section Geometry (Help>Help ).

Following is the list of basic commands, available in the Layers window (see Figure 19):

New : Create a new layer. A new layer will automatically be selected as ‘Layer To Use’.

Layer To Use : Select a layer to be used as default. All new geometry entities will be created within this layer.

Delete : Delete a layer. A layer can only be deleted if it doesn’t include any entities.

Rename : Change the name of a layer.

Send To : Moves entities to a new layer. No new entities are created.

Make sure you have completed previous five steps and press Next to continue with Control Volume definition.