Surface Mesh CleaningSurface Mesh Cleaning

KVRC 2014KVRC 2014

ObjectivesObjectives

Outline mesh cleaning related issues Outline mesh cleaning related issues that have been highlighted in Race 2;that have been highlighted in Race 2;

Give a few tips and tools available.Give a few tips and tools available.

VarianteVariante

Pre-mesh cleaning step

VarianteVariante

Post-mesh cleaning step

Additional faces created

VarianteVariante

What happened?What happened?

Original setup (mm)

Netfabb

CFD ready setup

Why using mesh cleaning?Why using mesh cleaning?

Holes in geometry are where edges are Holes in geometry are where edges are attached to only one surface.attached to only one surface.

Where holes are, the CFD meshing may Where holes are, the CFD meshing may not recognise a continuous surface and not recognise a continuous surface and may mesh inside the car/wheels/wings.may mesh inside the car/wheels/wings.

If the CFD meshing occurs inside, the If the CFD meshing occurs inside, the mesh may be of bad quality and affect the mesh may be of bad quality and affect the results…results…

VarianteVarianteOverlapping surfacesThe issue:

VarianteVariante

FixFixGeometry moved by about a couple of millimeters to make sure that both sides

are aligned.

LessonsLessons

Free edges = holes = mesh cleaningFree edges = holes = mesh cleaning

Mesh cleaning can affect geometry at Mesh cleaning can affect geometry at holes, soholes, so

Avoid free edges!!!Avoid free edges!!!

SketchUp is not a very good tool to design SketchUp is not a very good tool to design water-tight geometry.water-tight geometry.

ToolsTools

Netfabb Netfabb http://www.netfabb.com/http://www.netfabb.com/ MeshLab MeshLab

http://meshlab.sourceforge.nethttp://meshlab.sourceforge.net

SketchUp STL Exporter: SketchUp STL Exporter: http://www.khamsinvirtualracecarchahttp://www.khamsinvirtualracecarchallenge.com/do/STLExporterPlugin.rbzllenge.com/do/STLExporterPlugin.rbz