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ENGRID: Open-Source Mesh Generation
enGits GmbHMarie-Curie-Straße 8
79539 Lörrach Deutschland / Germany / Allemagne
OpenFOAM “Stammtisch”
Thursday, November 5, 2009
University of Stuttgart, Campus Vaihingen
Allmandring 30, 70569 Stuttgart
Oliver Gloth
Engrid: Open-Source Mesh Generation
OpenFOAM “Stammtisch”, 5 Nov. 2009, University of Stuttgart, Campus Vaihingen, Allmandring 30, 70569 Stuttgart page 2
OverviewOverview
• Where are we now
– Brief introduction
– Demonstration
– Examples
• Future
– What is planned?
– What is envisaged?
Oliver Gloth
Engrid: Open-Source Mesh Generation
OpenFOAM “Stammtisch”, 5 Nov. 2009, University of Stuttgart, Campus Vaihingen, Allmandring 30, 70569 Stuttgart page 3
Motivation for Open-Source MeshingMotivation for Open-Source Meshing
• enGits started in October 2006
– Main activity: software development for very specific CFD problems
– To extend business a reliable CFD solution was desired
• Commercial codes too expensive
(no guaranteed business coming in)
• Open-source, as well as in-house, solver and post-processing available
• Meshing situation not sufficient for commercial CFD work
• Expertise and a few ideas on how to improve unstructured
mesh generation
– Write own meshing software …
Oliver Gloth
Engrid: Open-Source Mesh Generation
OpenFOAM “Stammtisch”, 5 Nov. 2009, University of Stuttgart, Campus Vaihingen, Allmandring 30, 70569 Stuttgart page 4
Motivation for Open-Source MeshingMotivation for Open-Source Meshing
• Open-source or proprietary software?
• Decision was made rather quickly in favour of OSS
• As a small company it would be extremely difficult to
compete with the commercial codes
• Funding available for an open-source development(funded by the European Space Agency)
• Possibility to generate business with support and
customisation of the software
Oliver Gloth
Engrid: Open-Source Mesh Generation
OpenFOAM “Stammtisch”, 5 Nov. 2009, University of Stuttgart, Campus Vaihingen, Allmandring 30, 70569 Stuttgart page 5
open-source „process chain“open-source „process chain“● geometry modelling
● Blender
● Salome
● geometry import and surface meshing
● Gmsh
● NETGEN
● isentropic volume meshing (tetras)
● NETGEN
● Tetgen → ATTENTION: not allowed for commercial applications, NOT OPEN-SOURCE
● an-isotropic boundary layer grids
● … → Engrid
● solver
● OpenFOAM
● Code Saturne
● Elmer
● visualisation
● ParaView
● Open Data Explorer
Oliver Gloth
Engrid: Open-Source Mesh Generation
OpenFOAM “Stammtisch”, 5 Nov. 2009, University of Stuttgart, Campus Vaihingen, Allmandring 30, 70569 Stuttgart page 6
Current Status of ENGRIDCurrent Status of ENGRID
• Capable to create unstructured hybrid grids for CFD (prisms & tetras)
• Reliable support for prismatic boundary layers
• Requires a triangulated surface as input
– STL files like for snappyHexMesh
– NETGEN could be used as IGES/STEP → STL converter
• Exports OpenFOAM cases (native format)
• Experimental support for polyhedral grids
– direct export to OpenFOAM
• Basic modification tools (e.g. extrusion, rotation)
Oliver Gloth
Engrid: Open-Source Mesh Generation
OpenFOAM “Stammtisch”, 5 Nov. 2009, University of Stuttgart, Campus Vaihingen, Allmandring 30, 70569 Stuttgart page 7
Brief Technical BackgroundBrief Technical Background
• ENGRID uses NETGEN to create tetrahedral grids
from surface triangulations
• Prismatic layers are “seeded” and “grown” into an
existing and healthy grid
• No overlapping in sharp corners
• Polyhedral support keeps the boundary layer as it
is and “dualises” the tetrahedral part of the mesh
Oliver Gloth
Engrid: Open-Source Mesh Generation
OpenFOAM “Stammtisch”, 5 Nov. 2009, University of Stuttgart, Campus Vaihingen, Allmandring 30, 70569 Stuttgart page 8
Creating Prismatic LayersCreating Prismatic Layers
Oliver Gloth
Engrid: Open-Source Mesh Generation
OpenFOAM “Stammtisch”, 5 Nov. 2009, University of Stuttgart, Campus Vaihingen, Allmandring 30, 70569 Stuttgart page 9
Creating Prismatic LayersCreating Prismatic Layers
Oliver Gloth
Engrid: Open-Source Mesh Generation
OpenFOAM “Stammtisch”, 5 Nov. 2009, University of Stuttgart, Campus Vaihingen, Allmandring 30, 70569 Stuttgart page 10
Creating Prismatic LayersCreating Prismatic Layers
Oliver Gloth
Engrid: Open-Source Mesh Generation
OpenFOAM “Stammtisch”, 5 Nov. 2009, University of Stuttgart, Campus Vaihingen, Allmandring 30, 70569 Stuttgart page 11
Creating Prismatic LayersCreating Prismatic Layers
Oliver Gloth
Engrid: Open-Source Mesh Generation
OpenFOAM “Stammtisch”, 5 Nov. 2009, University of Stuttgart, Campus Vaihingen, Allmandring 30, 70569 Stuttgart page 12
Creating Prismatic LayersCreating Prismatic Layers
Oliver Gloth
Engrid: Open-Source Mesh Generation
OpenFOAM “Stammtisch”, 5 Nov. 2009, University of Stuttgart, Campus Vaihingen, Allmandring 30, 70569 Stuttgart page 13
Creating Prismatic LayersCreating Prismatic Layers
Oliver Gloth
Engrid: Open-Source Mesh Generation
OpenFOAM “Stammtisch”, 5 Nov. 2009, University of Stuttgart, Campus Vaihingen, Allmandring 30, 70569 Stuttgart page 14
DemonstrationDemonstration
• Engrid is not perfect
– between 1.5 and 2 'man years' development
• We are happy about feedback
• We are happy about suggestions
• We would be even more happy about help ;-)
Oliver Gloth
Engrid: Open-Source Mesh Generation
OpenFOAM “Stammtisch”, 5 Nov. 2009, University of Stuttgart, Campus Vaihingen, Allmandring 30, 70569 Stuttgart page 15
DemonstrationDemonstration
Oliver Gloth
Engrid: Open-Source Mesh Generation
OpenFOAM “Stammtisch”, 5 Nov. 2009, University of Stuttgart, Campus Vaihingen, Allmandring 30, 70569 Stuttgart page 16
ExamplesExamples
Oliver Gloth
Engrid: Open-Source Mesh Generation
OpenFOAM “Stammtisch”, 5 Nov. 2009, University of Stuttgart, Campus Vaihingen, Allmandring 30, 70569 Stuttgart page 17
Vega at Ma=2.7Vega at Ma=2.7
Oliver Gloth
Engrid: Open-Source Mesh Generation
OpenFOAM “Stammtisch”, 5 Nov. 2009, University of Stuttgart, Campus Vaihingen, Allmandring 30, 70569 Stuttgart page 18
Vega at Ma=2.7Vega at Ma=2.7
Oliver Gloth
Engrid: Open-Source Mesh Generation
OpenFOAM “Stammtisch”, 5 Nov. 2009, University of Stuttgart, Campus Vaihingen, Allmandring 30, 70569 Stuttgart page 19
Vega at Ma=2.7Vega at Ma=2.7
Oliver Gloth
Engrid: Open-Source Mesh Generation
OpenFOAM “Stammtisch”, 5 Nov. 2009, University of Stuttgart, Campus Vaihingen, Allmandring 30, 70569 Stuttgart page 20
Vega at Ma=2.7Vega at Ma=2.7
Oliver Gloth
Engrid: Open-Source Mesh Generation
OpenFOAM “Stammtisch”, 5 Nov. 2009, University of Stuttgart, Campus Vaihingen, Allmandring 30, 70569 Stuttgart page 21
Vega at Ma=2.7Vega at Ma=2.7
Oliver Gloth
Engrid: Open-Source Mesh Generation
OpenFOAM “Stammtisch”, 5 Nov. 2009, University of Stuttgart, Campus Vaihingen, Allmandring 30, 70569 Stuttgart page 22
Vega at Ma=2.7Vega at Ma=2.7
Oliver Gloth
Engrid: Open-Source Mesh Generation
OpenFOAM “Stammtisch”, 5 Nov. 2009, University of Stuttgart, Campus Vaihingen, Allmandring 30, 70569 Stuttgart page 23
Vega at Ma=2.7Vega at Ma=2.7
Oliver Gloth
Engrid: Open-Source Mesh Generation
OpenFOAM “Stammtisch”, 5 Nov. 2009, University of Stuttgart, Campus Vaihingen, Allmandring 30, 70569 Stuttgart page 24
StageStage-Separation-Separation
Oliver Gloth
Engrid: Open-Source Mesh Generation
OpenFOAM “Stammtisch”, 5 Nov. 2009, University of Stuttgart, Campus Vaihingen, Allmandring 30, 70569 Stuttgart page 25
StageStage-Separation-Separation
Oliver Gloth
Engrid: Open-Source Mesh Generation
OpenFOAM “Stammtisch”, 5 Nov. 2009, University of Stuttgart, Campus Vaihingen, Allmandring 30, 70569 Stuttgart page 26
9090ºº Bend (Ventilation system Tauerntunnel) Bend (Ventilation system Tauerntunnel)
Oliver Gloth
Engrid: Open-Source Mesh Generation
OpenFOAM “Stammtisch”, 5 Nov. 2009, University of Stuttgart, Campus Vaihingen, Allmandring 30, 70569 Stuttgart page 27
9090ºº Bend (Ventilation system Tauerntunnel) Bend (Ventilation system Tauerntunnel)
Oliver Gloth
Engrid: Open-Source Mesh Generation
OpenFOAM “Stammtisch”, 5 Nov. 2009, University of Stuttgart, Campus Vaihingen, Allmandring 30, 70569 Stuttgart page 28
9090ºº Bend (Ventilation system Tauerntunnel) Bend (Ventilation system Tauerntunnel)
Oliver Gloth
Engrid: Open-Source Mesh Generation
OpenFOAM “Stammtisch”, 5 Nov. 2009, University of Stuttgart, Campus Vaihingen, Allmandring 30, 70569 Stuttgart page 29
9090ºº Bend (Ventilation system Tauerntunnel) Bend (Ventilation system Tauerntunnel)
Oliver Gloth
Engrid: Open-Source Mesh Generation
OpenFOAM “Stammtisch”, 5 Nov. 2009, University of Stuttgart, Campus Vaihingen, Allmandring 30, 70569 Stuttgart page 30
9090ºº Bend (Ventilation system Tauerntunnel) Bend (Ventilation system Tauerntunnel)
Oliver Gloth
Engrid: Open-Source Mesh Generation
OpenFOAM “Stammtisch”, 5 Nov. 2009, University of Stuttgart, Campus Vaihingen, Allmandring 30, 70569 Stuttgart page 31
Satellite TankSatellite Tank
Oliver Gloth
Engrid: Open-Source Mesh Generation
OpenFOAM “Stammtisch”, 5 Nov. 2009, University of Stuttgart, Campus Vaihingen, Allmandring 30, 70569 Stuttgart page 32
Fabric of a FilterFabric of a Filter
Oliver Gloth
Engrid: Open-Source Mesh Generation
OpenFOAM “Stammtisch”, 5 Nov. 2009, University of Stuttgart, Campus Vaihingen, Allmandring 30, 70569 Stuttgart page 33
Fabric of a FilterFabric of a Filter
Oliver Gloth
Engrid: Open-Source Mesh Generation
OpenFOAM “Stammtisch”, 5 Nov. 2009, University of Stuttgart, Campus Vaihingen, Allmandring 30, 70569 Stuttgart page 34
Fabric of a FilterFabric of a Filter
Oliver Gloth
Engrid: Open-Source Mesh Generation
OpenFOAM “Stammtisch”, 5 Nov. 2009, University of Stuttgart, Campus Vaihingen, Allmandring 30, 70569 Stuttgart page 35
Subway StationSubway Station
Oliver Gloth
Engrid: Open-Source Mesh Generation
OpenFOAM “Stammtisch”, 5 Nov. 2009, University of Stuttgart, Campus Vaihingen, Allmandring 30, 70569 Stuttgart page 36
Complex Air-DuctComplex Air-Duct
Oliver Gloth
Engrid: Open-Source Mesh Generation
OpenFOAM “Stammtisch”, 5 Nov. 2009, University of Stuttgart, Campus Vaihingen, Allmandring 30, 70569 Stuttgart page 37
Planned DevelopmentsPlanned Developments
• Interpolated surfaces
• Anisotropic (prisms) refinement of free shear layers
– feasibility/demonstration for customer
– first step towards adaptive meshing
• Better control of mesh density
– better user interface
– point, line, …, sources
• Interface to more OpenFOAM solvers
Oliver Gloth
Engrid: Open-Source Mesh Generation
OpenFOAM “Stammtisch”, 5 Nov. 2009, University of Stuttgart, Campus Vaihingen, Allmandring 30, 70569 Stuttgart page 38
Interpolated SurfacesInterpolated Surfaces
Oliver Gloth
Engrid: Open-Source Mesh Generation
OpenFOAM “Stammtisch”, 5 Nov. 2009, University of Stuttgart, Campus Vaihingen, Allmandring 30, 70569 Stuttgart page 39
Interpolated SurfacesInterpolated Surfaces
Oliver Gloth
Engrid: Open-Source Mesh Generation
OpenFOAM “Stammtisch”, 5 Nov. 2009, University of Stuttgart, Campus Vaihingen, Allmandring 30, 70569 Stuttgart page 40
Interpolated SurfacesInterpolated Surfaces
Oliver Gloth
Engrid: Open-Source Mesh Generation
OpenFOAM “Stammtisch”, 5 Nov. 2009, University of Stuttgart, Campus Vaihingen, Allmandring 30, 70569 Stuttgart page 41
Interpolated SurfacesInterpolated Surfaces
Oliver Gloth
Engrid: Open-Source Mesh Generation
OpenFOAM “Stammtisch”, 5 Nov. 2009, University of Stuttgart, Campus Vaihingen, Allmandring 30, 70569 Stuttgart page 42
Interpolated SurfacesInterpolated Surfaces
Oliver Gloth
Engrid: Open-Source Mesh Generation
OpenFOAM “Stammtisch”, 5 Nov. 2009, University of Stuttgart, Campus Vaihingen, Allmandring 30, 70569 Stuttgart page 43
Interpolated SurfacesInterpolated Surfaces
Oliver Gloth
Engrid: Open-Source Mesh Generation
OpenFOAM “Stammtisch”, 5 Nov. 2009, University of Stuttgart, Campus Vaihingen, Allmandring 30, 70569 Stuttgart page 44
Refinement of Free Shear LayersRefinement of Free Shear Layers
Size in y-direction exaggerated
Oliver Gloth
Engrid: Open-Source Mesh Generation
OpenFOAM “Stammtisch”, 5 Nov. 2009, University of Stuttgart, Campus Vaihingen, Allmandring 30, 70569 Stuttgart page 45
Refinement of Free Shear LayersRefinement of Free Shear Layers(supersonic base-flow)(supersonic base-flow)
Oliver Gloth
Engrid: Open-Source Mesh Generation
OpenFOAM “Stammtisch”, 5 Nov. 2009, University of Stuttgart, Campus Vaihingen, Allmandring 30, 70569 Stuttgart page 46
Envisaged DevelopmentsEnvisaged Developments
• Adaptive meshing
– y+
– shear layers
– shocks
– ...
• Better support for polyhedral grids
• Hex far fields
– maybe coupled with snappyHexMesh
Oliver Gloth
Engrid: Open-Source Mesh Generation
OpenFOAM “Stammtisch”, 5 Nov. 2009, University of Stuttgart, Campus Vaihingen, Allmandring 30, 70569 Stuttgart page 47
Thank you for your attentionThank you for your attention
engits.com/engrid
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