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Slide Deck Available to Download: https://autodesk.box.com/cfd21
• Does the mesh look like the real world/CAD model?
• Are there 4-5 elements through narrow fluid channels? • Are fans, blowers and resistances adequately meshed? • Is the model mesh independent? • This usually takes a few solves to establish
Autodesk Help Webinar Series
1. Mesh Controls 2. Solver Controls
If you have CFD open, feel free to grab the files and you can run through a couple of examples as we go: https://autodesk.box.com/cfd21 Autodesk Help Webinar Series
1: Mesh Controls
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This is a bad mesh Is the mesh fine enough, that it accurately represents the CAD model?
This is a better mesh
If the meshed does not compare to the real world model, the mesh is too coarse and requires refinement.
Autodesk Help Webinar Series
• • • •
Poor
Good
The boundary layer is huge compared to the tetrahedral elements
Plenty of elements across the gap and a small boundary layer
Utilise Surface and Gap Refinement When using Gap Refinement, setting 3 Fluid Gap Elements generally seems to be the optimum Think about Thin Solid Elements Tip: 4-5 elements is a nice rule to use Autodesk Help Webinar Series
dP = 0.397 Bar (The results here were clearly mesh dependent) Autodesk Help Webinar Series
dP = 0.230 Bar
Todd
Autodesk Help Webinar Series
Autodesk Help Webinar Series
Autodesk Help Webinar Series
Autodesk Help Webinar Series
Autodesk Help Webinar Series
Autodesk Help Webinar Series
Autodesk Help Webinar Series
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2: Solver Controls
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LOW NAR
HIGH NAR
Autodesk Help Webinar Series
Autodesk Help Webinar Series
Autodesk Help Webinar Series
Slide Deck Available to Download : https://autodesk.box.com/cfd21
Slide Deck Available to Download : https://autodesk.box.com/cfd20