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Inverting Models in CFD-CADalyzer |
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Computational Fluid Dynamics (CFD) requires the discretization of a
geometry bounded by it's wetted surfaces. In CAD, the solid parts are
created without the corresponding fluid volumes, i.e. negative space.
For many CFD models, only the fluid volume is needed, and thus an easy
way to create it is needed. CFD-CADalyzer provides the capability to
invert the model to get the fluid volume with the option to also keep
the solid part.
In order to invert a model the user has to do
the following manipulations:
- Open your CAD model in CFD-CADalyzer
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Go to Geometry → Geometry Tools and select the Invert Model option, as shown in Figure 1.
Figure 1. Inversion tool in under Geometry options in CFD-CADalzyer.
- Select the surfaces that cap the openings in the model, as shown in Figure 2. If the model is not fully capped, inversion will fail.
Figure 2. Selected surfaces that cap the openings in the model.
When
the Invert Model button is clicked, CFD-CADalyzer will prompt you with
an option to keep the original part. For flow analysis only, select No. If you would like to keep the solid part to do a fluid/solid
coupled thermal analysis, select Yes.
For this example, the
solid part is discarded and only the fluid region is kept, as shown in
Figure 3. The model is now ready for mesh generation.
Figure 3. Inverted CAD model.
The next time you need to invert your CAD model, try using CFD-CADalyzer's inversion tools.
Regards,
Daniel Vinteler
ESI CFD Support Team
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