By using different tools in the pre-processing module of Tdyn you can define geometries typical for CAD systems like NURBS or COONS. The pre-processing module allows importing CAD archives into NASTRAN Interface that are saved in IGES, DFX, VDA or PARASOLID or other formats. To help the geometry definition process, NASTRAN Interface works with variety of CAD tools or visualizations options.

Once the geometry definition is finished, the problem data is entered into the same environment of NASTRAN Interface. With NASTRAN Interface you have the important control of the mesh generation by being able to change the size and quality of elements.

NASTRAN Interface saves your time by using semiautomatic data definition tasks. Materials and boundary conditions will be able to be assigned directly over geometry entities without previous mesh generation, which makes this process to be a simple and natural. This makes NASTRAN Interface to be non-dependent on the finite element model. This means, that if for any reason, the geometry have to be re-meshed, it will not be necessary to re-assign the conditions.
On the other hand, the option to assign conditions and materials to mesh elements is also available to satisfy all possible necessities of different users.

The process of obtaining an input file for NASTRAN codes is completely automized and only needs to define some of the problem paramters. Optimizaed algorithoms make this task very fast even for models with big number of elements.