SOLID MESHING OF REAR VIEW MIRROR USING ANSA

  SOLID MESHING OF REAR VIEW MIRROR USING ANSA

AIM :-

TO create the tetra meshing for rear view mirror model by eliminating geometrical errors and Considering the given element Quality Criteria using ANSA.

Procedure:-

1) IMPORT THE CAD MODEL AND GEOMETRY CLEANUP:

     1) First, we open ANSA software and then we import the CAD model using FILE ~ OPEN

     2)After importing the Cad model, the TOPO was given to the entire Component.

     3)Geometry was refined by changing the length of elements to 1mm.Do this by using the LENGTH option under PERIMETERS in the Mesh module.

     4)Check for the geometry errors in the model by using the CHECKS ~ GEOMETRY under the TOOLS menu.

                                       FIG 1. Geometry errors Present in the model

5) In this CAD model, the geometry errors were cleared using the AUTOFIX option.

                              FIG 2. After Clearing  all the Geometry errors in the model.

2) Surface Meshing ( Shell Meshing ) :-

1) Before we do meshing, we need to set the quality Criteria in the aim to get good quality mesh, To do this, Go to UTILITIES bar and click on the QUALITY CRITERIA option and then required quality parameters are entered as per the given problem and in the presentation parameters , the elemnets check is ticked.

                                                   FIG 3. Quality criteria ( Shell Meshing )

  2)we then specify the average ( or ) target element length, min.length and max. length using the MESH  PARAMETERS option in the UTILITIES tool bar.

                                                             FIG 4. Mesh Parameters

  3)For meshing, we need to set the element size, for this go to PERIMETERS ~ LENGTH  and enter the value as 1.

  4) Mesh is done on the model using the SPOT MESH option in the MESH GENERATION section.

  5)Geometric features such as curved areas are meshed with Orthotrias.

  6)Flat faces are meshed with Normal trias.

  7)Mesh flow is modified using RECONSRUCT option in SHELL MESH section.

  8)It is made sure that there were no Quality failed elements in the model before going to volume Meshing.

                                                 FIg 5. Spot Meshing ( Rotatating ball )

                                      Fig 6. Spot Meshing ( Mirror )

                                      Fig 7. Spot Meshing ( Mirror Holder )

                                       Fig 8. Spot Meshing ( Mirror Fixture )

                            Fig 9. Spot Meshing ( Entire Component )

3) Volume Meshing ( Solid Meshing ) :-

 1) Once the mesh is done on the surface ,we need to define the volumes for each individual seperately This is done using DEFINE VOLUME ~ MANUAL option in the VOLUMES  section of the VOLUME MESH module.

                          FIG 10. Volumes Defined 

2) After Defining the volumes for each part seperately, PID is set for each part volume seperately by using SET PID ~ NEW ~ PSOLID option.

                              Fig 11. PIDs defined in the model 

3) We do solid Meshing for  the Defined volumes using TETRA FEM , This is done using TETRA FEM option in UNSTRUCTURED MESH section of the VOLUME MESH module.

                               Fig 12. Volumes defined ( as shown in the list after Meshing with Tetra Fem )

4) Tetra Fem is Unstructured Mesh and Tetra Fem  was  used instead of Tetra Rapid  for better Results.

5) After doing Solid Meshing of the Whole Component , We need to check for the TET COLLAPSE by inputing the given tetcollapse value 0.2 in QUALITY CRITERIA ~ SOLIDS

                                 Fig 13. Quality Criteria ( solid Meshing )

                            Fig 14. Volume Meshing ( Entire Component )

                             Fig 15. Section view ( Volume Meshing )

                           Fig 16. Final Component ( Shell and Solid Meshing )

CONCLUSION:-

Tetra Meshing is done successfully for a rear view mirror model by eliminating geometrical errors and Considering the given element Quality criteria using ANSA.

LEARNING OUTCOMES:-

1) Learnt Ortho tria and tria Meshing for Solid parts.

2) Learnt Tetra Meshing for Solid parts.

3) Learnt  how to fix Quality failed elements in Solid Meshing.