Case study of conversion from CAD to SolidWorks and ...€¦ · CAD conversion to SolidWorks •...
Transcript of Case study of conversion from CAD to SolidWorks and ...€¦ · CAD conversion to SolidWorks •...
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Case study of conversion from CADto SolidWorks and Paraview formats
by CADfixWayne Arter
• From Heating and Fuelling dept-related work
• Conversion of CAD to NUCODE input
• Specifically CATIA V5 to Paraview vtk format
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CAD supplied by Drawing Office
ITER duct geometry 5.5m × 1.6m exterior.
• Two part CATIA assembly- liner shield and liner (including
pipework)
• Shield - 26.8 Mbyte geometry database file with 28 bodies
• Liner - 32.3 Mbyte file with 260 bodies
• 10732 surfaces and 25281 lines or edges
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CAD conversion to SolidWorks
• Read by CADfix 7.0 and exported in STEP format for Solid-
works 2006, successfully read by Solidworks 2007.
• No user intervention.
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Duct geometry
Entrance to duct
Drawings of duct CAD
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CADfix 7.0 images of shield
Shield showing exit to torus Shield in close-up
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CADfix 7.0 images of liner
Liner showing exit to torusLiner in close-up
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CADfix 7.0 images of duct assembly
Exit to torus Automatically simplified model
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First attempt at duct model
Initial CAD conversions• Hole removal requested
• 1652 surfaces as can-
didates for merging,
1 572 merged
• Innermost surfaces then
formed into set contain-
ing 446 surfaces and
1583 curves
• But 56 pipe-widths
along duct. Long, thin
features.
Liner based model
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Second attempt at duct model
CAD manipulations• New model - liner
surfaces surrounded by
shield surfaces.
• Process shield and liner
separately - shield sur-
faces extracted
• Difficult surfaces re-
placed by hand
• Most surfaces joined au-
tomatically
Shield as surfaces(Replaced surfaces appear in ma-
genta)
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Shield as surfaces
Connectivity of lines Simple mesh
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Liner as surfaces
Shaded surfaces Simple mesh
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Shield as surfaces, showing connectivity
Two surfaces now properly joined
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Assembly as surfaces, showing connectivity
553 surfaces made with 1877 curves
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Assembly - 95000 triangle mesh
Entrance to duct in close-up Shaded mesh
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Assembly - meshing experiments
CAD manipulations• Simple mesh used
DELM/Mapped option
• Advanced meshing op-
tion - chord sag param-
eter
• Maximum edge size
of 100mm
• DELC option
45000 triangle mesh
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Paraview image of duct
Surfaces colour shaded with dummy data
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Paraview image of duct
45000 triangle meshing
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Conclusion - for Neutronics
• CADfix as viable option to defeature CATIA and export to
SolidWorks. Application to Attila.
• Experiments with meshing valuable for underlying research.
• Demonstration of locally written software to convert CADfix
database to different format (vtk in this instance, but could
be MCNP-input)
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