Week- 5 - Solid meshing

SOLID MESHING FOR REAR VIEW MIRROR

OBJECTIVE

• Import the CAD geometry of rare view mirror assembly
• Clean Up the geometry until no topological error is found
• Mesh geometry with target average length of 1mm with no more
• Assign closed volume and generate volume mesh using the given qulaity criteria

ABSTRACT

A rear view mirror is flat mirror in automobile and other vehicles designed to allow the driver to see rearward through the vehicle rear window. In this going we are going to generate volume mesh for rare view mirror using tools of ANSA .There is no need to generate any mid surface for this geometry .The given geometry must be meshed on the surface and then model should be assigned as a closed volume to generate volume mesh .Also we need to remove tetcollapses after generating volume mesh

METHODOLOGY

• Import the CAD geometry and do geometry clean up with no topological error
• Assign the property ID (PID) for each part
• Setup Qulaity criteria and generate mesh
• Assign closed volume for the given geometry
• Generate volume mesh

GEOMETRY CLEAN UP

After importing the geometry into ANSA there will be many topological errors .In order to prevent this we do geometry clean up.

After all the error are rectified if you check the geometry the exceution will be 100% then you can move forward

ASSIGN PROPERTY ID (PID)

Every part in the geometry has its own property .We can assign PID using ANSA .We have to select the part and click apply then we have to select the whole part using window selection to apply the PID

PID ASSIGNED

MESHING AND IMPROVEMENT OF THE MESH

After assigning all the quality criteria and mesh parameters one has to do meshing for geometry.Meshing should be done at smaller regions in the beginning and continue on the flat areas so that links and raised edges can be avoided

MESHING AT SMALLER REGION

We can use align option in order to remove kinks and raised edges.First select the node which is to be removed and the select three points on the surface in order to move that selected load to the same surface. In this way the surface will be smoother for the geometry.Isolate each part for better meshing and spotting errors.

GENERATING VOLUME MESH

Volume mesh can be created in ANSA only if it is recognizes the geometry as a closed volume therefore we must manually update model to closed volume.To convert our model to closed volume one must define volume

ANSA might crash if we generate volume mesh for the whole geometry.So define individual closed volumes for diffrent PID.Defined volumes can be checked under list option under volume.One can give either tetra rapid or tetra fem under unstructed mesh dialog box for closed volume

CONCLUSION

Solid meshing is sucessfully generated for rear view mirror using the given quality criteria mentioned under the challenge .There are no raised edges tetcollapses .From this know how volumes are defined and meshed .

OUTCOME

• Able to do topological clean up with no errors
• Aware of all the quality criteria and quality parameters during mesh generation
• Learnt how to define closed volume
• Generate tetra rapid mesh for closed volume