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CFD-GEOM User Tips

One-click meshing with the CFD-GEOM Tet mesher

For unstructured geometries with more than one domain, you can individually mesh the surfaces and volume for each domain. But if you do not need fine mesh control, you can simply use the Tet Meshing tool to directly mesh all surfaces and domains at once. As an example of this time saving option, we will use the multi-domain model shown in Figure 1.

Figure 1. Geometry with three unstructured domains

To use this feature, go to Mesh → Unstructured Meshing Options and select the Tet Meshing tool as shown in Figure 2.

Figure 2. Tet Meshing tool

The user is then given a panel for Global Tet Mesh Properties. Make changes as needed. Then use Ctrl-A to select all domains and press the middle mouse button (or click the Mesh button) to mesh the geometry.

Figure 3. Tet Meshing options

The advantages of this feature include:

Meshing done in one operation and not on a per domain basis
Global or local cell size setting can be specified
No need to mesh surfaces

Figure 4. Resulting surface and volume mesh

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

Scripting and Journaling in CFD-GEOM V2007.2

In CFD-GEOM V2007.2, scripting and journaling are now available. Several improvements have been made to scripting, such as fewer modules that are arranged in a more logical manner, more robust functionality, etc. As in previous versions of CFD-GEOM, the Python scripting language is still used to create the CFD-GEOM scripting functions. If you are interested in scripting and journaling in CFD-GEOM, please read on.

Mixing Structured and Unstructured 2D Grids

One of the most common questions that occurs during CFD-GEOM Training sessions is "How do I generate mixed structured and unstructured grids?" Both grid types have their specific advantages and disadvantages, e.g. structured grids are very efficient in resolving the viscous terms, whereas unstructured grids can be used to handle complex geometries.

Using Parameters to Create Your Geometry in CFD-GEOM

Often, you need run several different cases where you need to modify one or more geometrical values where the overall shape of the entity is the same, only the size changes. In this case, it is useful to use CFD-GEOM scripting for your grid generation, rather than doing it interactively using the GUI.

Semi-Structured Domain Stitching in CFD-GEOM

A feature that allows users to stitch together a Semi-Structured domain is available in CFD-GEOM. This feature gives the user flexibility of stitching two end faces with different topologies, i.e. a geometry that cannot be extruded.

Block coarsening in CFD-GEOM

One of the challenges of using structured meshes is that the grid resolution away from the region of interest is sometimes more than necessary. The Coarsen Structured Domains tool in CFD-GEOM provides a method to coarsen structured domains (also called blocks), thus reducing the mesh size and avoiding the use of arbitrary interfaces.