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More information about GiD:

Developers:

- Ramon Ribó ramsan@cimne.upc.es
- Miguel A. Pasenau de Riera miguel@cimne.upc.es
- Enrique Escolano escolano@cimne.upc.es

http://www.gidhome.com

# INTRODUCTION

GiD is an interactive graphical user interface used for the definition, preparation and visualization of all the data related to a numerical simulation. This data includes the definition of the geometry, materials, conditions, solution information and other parameters. The program can also generate a mesh for finite element, finite volume or finite difference analysis and write the information for a numerical simulation program in its desired format. It is also possible to run the numerical simulation from within GiD and to visualize the results of the analysis.

GiD can be customized and configured by users so that the data required for their own solver modules may be generated.These solver modules may then be included within the GiD software system.

The program works, when defining the geometry, similar to a CAD (Computer Aided Design) system but with some differences. The most important one is that the geometry is constructed in a hierarchical mode. This means that an entity of higher level (dimension) is constructed over entities of lower level; two adjacent entities will then share the same lower level entity.

All materials, conditions and solution parameters can also be defined on the geometry without the user having any knowledge of the mesh: the meshing is done once the problem has been fully defined. The advantages of doing this are that, using associative data structures, modifications can be made to the geometry and all other information will automatically be updated and ready for the analysis run.

Full graphic visualization of the geometry, mesh and conditions is available for comprehensive checking of the model before the analysis run is started. More comprehensive graphic visualization features are provided to evaluate the solution results after the analysis run. This post-processing user interface is also customizable depending on the analysis type and the results provided.

## Using this manual

This manual has been split into five clearly differentiated parts.

It consists of a first part, General aspects, where the user can find the program from basics. This helps gain confidence on how to get the maximum from the interactive actions between users and the system.

The second part, Pre-processing, describes the pre-processing functionality. The users will learn how to configure a project, define all its parts, geometry, data and mesh.

The third part, Analysis, is related to the calculation process. Although it will be performed by an independent solver, it forms part of the integrated GiD system in the sense that the analysis can be run from inside GiD.

The fourth part, Post-processing, emphasizes aspects related to the visualization of the results.

The fifth part, Customization, explains how to customize the users own files to be able to introduce and run different solver modules according to their own requirements.

Different kinds of fonts are used to help the users follow all the possibilities offered by the code:

1. `font` is used for the options found in the menus and windows.
2. ``font'` is used for the windows names used in the post-processing.
3. font is used for special references in some parts.

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