tdynreference manual


Preliminary step (read or create the geometry based on 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 Utilities>Tdyn Wizard>Tdyn Wizard

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.

2.      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).

3.      free_surf layer: Lines of the body (if any) belonging to the (initial) free surface (floating line) have to be assigned to the body_dry 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).

4.      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 10 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:

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.

Figure 11 Layers window commands

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