The Project Surface tool of CFD-GEOM allows the projection of a single surface onto a collection of surfaces. The collection of surfaces may contain gaps and overlaps, and the resulting projected surface will then covers these imperfections. Furthermore, because the resulting surface is an approximation of the collection, it allows the user to cover small features which may be harmful during surface meshing.

In the example below, a surface (Surface 3) will be projected onto two disconnected surfaces (Surfaces 1 and 2), as depicted in figure 1. The general steps involved are as follows:

Figure 1.  Surfaces used for the projection

1. Go to 'Geometry -> Trimmed Surface Creation Options' and select "Project Surface", as shown in Figure 2.

   

   Figure 2.  Project Surface option

2. Pick the surface(s) to be projected and click the middle mouse button. In this example, it would be Surface 3.
3. Pick the surfaces onto which Surface 3 will be projected and click the middle mouse button. These would be Surfaces 1 and 2.
4. Select the projection direction. In this case, Surface 3 will be projected normal to Surface 1 and 2 using the "Normal" projection option.
5. Click "Preview" to verify that the projection is correct.
6. Click the middle mouse or Apply button to complete the surface projection (see figure 3 below).

   

   Figure 3.  Surface after projection

If you have any questions about this tip or would like us to discuss other topics in the future, please let us know.

Regards,
ESI CFD Support Team