Pre-processing

The first step for any analysis is the setting up of the problem. This includes the creation or importation from a CAD file of the problem's geometry (i.e. the control volume) the assignment of boundary and initial conditions, and the generation of the mesh. This will all be made in the PREPOST module of the Tdyn environment (based on the Custom GiD system).

Remarks :

A full description of the CAD preprocessing capabilities of the environment can be found in the GiD reference and user manuals (see Postprocessing section).

When setting up a new analysis for calculation with Tdyn, the specific Tdyn problemtype has to be loaded and assigned to the problem. This can be done at any point from the creation of the new file to the final definition of the geometry, but has to be performed before the user can proceed to assigning boundary conditions and other problem parameters. The problemtype assignment (Tdyn2D, Tdyn2DA or Tdyn3D) is done by following the menu sequence shown in Figure 2. Tdyn2D, Tdyn2DA, Tdyn3D correspond to the 2D planar, 2D axisymmetric and 3D versions of the program.

Remarks :

Tdyn problemtype is automatically loaded when Tdyn is started from the Tdyn icons of the CompassFEM program group.

The first time Tdyn is opened, Tdyn Preferences window shown in Figure 3 is started. It can also be opened at any moment by selecting Utilities>Tdyn Preferences menu option. This window allows to select what modules of Tdyn are going to be used. This way menus and windows of Tdyn are simplified by removing the useless options. Once Accept button is selected, Tdyn should be restarted (by selecting the menu sequence shown in Figure 2 or by loading again the current project).

Remarks :

Note that the selection of the Tdyn Preferences window is taken as preferences for the future analyses. It is recommended to select in this window all the options to be used in the future and not only those to be used in the present case.

Pre-processing part of the analysis consist of the following steps:

The Tdyn pre toolbar shown in Figure 4 has been designed to guide the user during the pre-processing part of the analysis. By clicking the icons sequentially all (in most of the cases) the necessary steps of the preprocessing part will be performed.