Content | Dimensions and geometry | 2D mesh | 3D mesh

 Dimensions and geometry

The car we decided to mesh is the Renault Twingo.

We found information about the car's outer and inner dimensions in the Renault Twingo user manual.

The following picture shows the car's outer dimensions :

To avoid too many problems, we decided to approximate the cabin geometry with straight lines.


 Two dimensional mesh

In order to construct our model and to test it quickly, a 2D mesh was generated, as shown in the picture below:

This mesh is very basic, due to the mesher used, Gambit, and to avoid too complex meshing process. It contains 6000 cells. The passengers are not modelled.


 Three dimensional mesh

A basic mesh of the car is built for this approach and the passengers are not modeled. The three dimensional meshing was very much complex than the two dimensional one and took the major part of our project.

We have used two meshers, GAMBIT and ICEM. Using these two tools was interesting to do a comparison.

 Mesh with Gambit

The mesh is composed of 76000 cells and is represented on the picture below :

Creating complex geometry is pretty hard with GAMBIT. The second inconvenient is that it is quite impossible to work on the geometry after the meshing operation without being obliged to destroy completely the cells, faces and lines of the mesh.

In order to have larger possibilities and to make this task easier, we chose to use ICEM.

 Mesh with ICEM

This new mesh is composed of 160000 cells. As you can see, the console is included and the design is improved. The three following pictures represent three different views of the mesh :

The new mesh is smoother and it was more comfortable to design it.

ICEM proves therefore to be an easier tool to create complex geometry and work on details.