msc.gs-mesher fully automated surface and solid mesher a ...msc.gs-mesher / value reduced time to...

MSC.Moscow Forum 2001 Oct. 25th 2001 - MoscowMSC.Moscow Forum 2001 MSC.Moscow Forum 2001 Oct. 25th 2001 Oct. 25th 2001 -- MoscowMoscow

MSC.GS-MesherMSC.GS-Mesher

Fully Automated Surface and Solid Mesher

A Breakthrough in Meshing Technology

MSC.SoftwarePresented by:

Arnold Holler


MSC.GS-Mesher / SurfaceMSC.GS-Mesher / Surface

Typical Problem Areas:Small EdgesSliver SurfacesNon-congruent SurfacesGapsOverlap of SurfacesSurplus in detail, holes, etc.Tolerance Issues

Gap

Small Edge

Sliver Surface



Accuracy of Mesh Depends Strongly on Geometry

Sliver surfaces, small details (e.g. holes), will result in too many and/or bad shaped elements.

It is not always possible to create high quality elements (e.g. surfaces have bad parameterization)

If Geometry is non-congruent, Mesh will in general be non-congruent too.



Characteristics:Fully Automatic Process; User can Control Process.Automatic Model Cleanup !!!! Virtual TopologyOutside of Model and Inner Holes will be PreservedNo need for the User to make Geometry CongruentSupports Feature Angle and Edge (fillets)



Current Version can Import:Parasolid V11.0BDF FilePro/Engineer

Future Version can Access:CATIA, SDRC, UnigraphicsAcisSTL file



Example of “simple” surfaces with:

Gaps

Overlapping Surface



BMW Tunnel Model

Many Incongruent Surfaces

Many Sliver Surfaces, Gaps, Overlapping Surfaces



Volkswagen Model



Congruent Model Derived Automatically



Idealized Model



Mesh on Idealized Geometry



STL File / Door of Car



Idealized Geometry



Quad Mesh on Idealized Geometry



Conclusion

Create High Quality Mesh in a Short Time

User Time to Create Mesh is Minimal!

Works on:Geometry or FEMSTL file

Deals with gaps, overlapping surfaces, slivers


MSC.GS-Mesher / SolidCharacteristicsMSC.GS-Mesher / SolidCharacteristics

Direct Access to Geometry

Geometry will remain in CAD system, so:No Accuracy IssuesNo Tolerance IssuesCAD System Knows “best” how to Evaluate the GeometryNo Need to Cleanup/Heal Geometry

Make High Quality MeshBetter Performance for Real Life ModelsAlmost no Training Required

Example:


Why MSC.GS-Mesher / SolidWhy MSC.GS-Mesher / Solid

It is very Labor Intensive to “heal” Geometry

How to Mesh this “Piston” model in MSC.GS-Mesher?


MSC.GS-Mesher / SolidMSC.GS-Mesher / Solid

Accessing this “piston” took 30 seconds. (It took 5 minutes to import it into MSC.Patran 2000 r2 )

No Cleanup needed. Piston appears as Solid and can directly be meshed.

Mesh can be Controlled:Several “Mesh Properties” can be Created and Assigned to Parts of the Model.


Approach in MSC.PatranApproach in MSC.Patran

Translation of Geometry with Potential Loss of Accuracy, Tolerance issues, etc.

UG/Parasolid Geometry

Pro/E Geometry

CATIA Geometry

etc.

PatranGeometry

MSC.Patran

Mesher


Future Geometry AccessFuture Geometry Access

UG/Parasolid Geometry

Pro/E Geometry

CATIA Geometry

etc.

PatranGeometry

Pro/E Geometry

CATIA Geometry MSC.GS-Mesher

MSC.Patran

Mesher

MSC Meshing Technology

Other CAD Geometry



Mesh ControlMaximum Element SizeMinimum Element SizeCurvatureTet4 or Tet10


MSC.GS-Mesher / Engine BlockMSC.GS-Mesher / Engine Block



MSC.PatranTakes Very Long Time to Import into MSC.PatranMany Defects. Would take Many Days to Repair

MSC.GS-Mesher on HP X-class / 1GhZ / 1 GB ram/W2K

Takes 16 seconds to Access Geometry in MSC.GS-MesherTakes 130 seconds to create Tet4 meshTakes 330 seconds to create Tet10 meshUser time 0!

Table on Next page shows numbers provided by customer


MSC.GS-Mesher / Engine BlockMSC.GS-Mesher / Engine Block

4 minutesUser + System Time35 Hours

0Elements to be repaired?

80,706Number of Nodes?

316,231 Tet elementsNumber of Tet Elements?

4 minutesSystem Time1 hours

0User Time34 hours

0Surfaces needed to be repaired

266

MSC.GS-MesherModel consists of 2,149 surfaces

Usual Technique


MSC.Patran / Engine Block ErrorsMSC.Patran / Engine Block Errors


MSC.GS-Mesher / Cylinder HeadMSC.GS-Mesher / Cylinder Head

3:30 hoursUser + System Time100 Hours

9Elements to be repaired

463,235Number of Nodes?

1,913,643 Tet elementsNumber of Tet Elements?

3:30 hoursSystem Time?

0User Time?

0Surfaces needed to be repaired

2,400

MSC.GS-MesherModel consists of 24,000 surfaces

Usual Technique


MSC.GS-Mesher / ValueMSC.GS-Mesher / Value

Reduced time to marketMSC.GS-Mesher saves preprocessing time, which helps the customer bring their product to market in a shorter period of time

Ease of useMSC.GS-Mesher saves labor otherwise required to clean up CAD geometry, and therefore allows customers to produce their products for less cost


MSC.GS-Mesher / FAQMSC.GS-Mesher / FAQ

Q. On which platforms does MSC.GS-Mesher run? A. At this moment, it only runs on Windows-NT and Windows-2000.

Q. Does MSC.GS-Mesher use licenses? A. Yes, MSC.GS-Mesher uses FlexLM licenses.

Q. Does MSC.GS-Mesher need a license to access ProE part files? A. Yes, a license for MSC.GS-Mesher is needed to access ProEpart files and also a ProE license is needed.



Q. In order to access ProE parts, does ProE need to be installed? A. Yes, ProE 2000i2 needs to be installed and a ProE license is needed.

Q. How easy is it to install MSC.GS-Mesher such that it can accessProE files? A. The installation of MSC.GS-Mesher is very straightforward ( setup.exe ).



Q. Can users control the mesh in MSC.GS-Mesher? A. Yes, one can specify a global edge length and add a mesh control to edges/faces/surfaces. "Meshing Properties" can be assigned to edges and faces.

Q. Does importing/accessing Parasolid files have an advantage above importing these into MSC.Patran? A. Limited, the result is the same.

Q. Can Loads/BCs be assigned in MSC.GS-Mesher? A. On purpose, MSC.GS-Mesher has been made a very fast and robust vertical application and it does an excellent job in meshing. LBC groups can be created and assigned to surfaces !!!! Groups.



Q. How does MSC.GS-Mesher communicate with other applications (to create properties, materials, Loads/BCs, etc.) A. MSC.GS-Mesher can export the tetmesh, tria mesh and groups (sets) to an MSC.Nastran BDF or an MSC.Patrandatabase.

Q. Can MSC.GS-Mesher be used in "batch" mode? A. Yes it can and actually this will be very useful to remesh"modified" CAD geometry without any user interaction.


MSC.Moscow Forum 2001MSC.Moscow Forum 2001

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msc.gs-mesher fully automated surface and solid mesher a ...msc.gs-mesher / value reduced time to...

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