Project 1 - 2D meshing on the instrumental Panel

2D Meshing on the Instrument Panel

Aim:-

1) To check the geometric errors and rectify them for the given CAD model.

2) To take the Mid-surface and Mesh the Component according to the given Quality criteria below.

Procedure:-

1) Importing the model:- 

     1) We first Import the CAD model to the ANSA database using the OPEN option in the FILE tab.

     2) After that,we set the perimeters and macros of the CAD model to 1mm for better visualization of all the areas using   the LENGTH option present under Perimeters tab of the Mesh module as shown in the image given below.

                       Fig 1,2- we set the Perimeters and Macros of the CAD model to 1mm for better visualization.

    3) After that,we preform TOPOLOGY over the whole CAD model so that the surface get properly stitched to each other using  the TOPO option present under the FACES tab of the TOPO module.

     2) Geometry cleanup:-

    1) In this process,we clean up all the errors present in the CAD geometry like unchecked Faces,needle Faces,Triple cons,single cons,cracked Faces etc.

    2) We go to the check geometry option present in tools tab to check for geometry errors in the CAD model as shown in the image given below.

                                        Fig 3. Geometry errors Present in the model.

    3) we, then clear all errors one by one manually to get a good geometry of the CAD model and again run the geometry check,Therefore we get a check CAD geometry with no errors on it as shown in the image given below.

                                      Fig 4. After clearing all the Geometry errors in the model.

        3) Mid-surfacing:-.

              1) we have to measure whole geometry region by region so that we can create a mid surface without any confusion.

              2) we use the MEASURE option present under the UTILITIES tab to measure the whole component region by region 

              3) After that,according to the measurements taken from the parent geometry we start taking the midsurface for component region by region.

              4) we use different options to take the midsurface in different regions like the OFFSET,MIDDLE present in the Faces tab.

              5) we finally obtain the mid-surface from the parent geometry as shown in the image given below.

                                        Fig 5. Mid surface taken from the Parent geometry.

                   6) we set seperate Part IDs for the Mid surfaced components as shown in the images given below.

                                   Fig 6. PIDs of the Instrument panel

                                   Fig 7. Mid surface of the Instrument Panel ( After assigning PIDs)

                4) Meshing and Assigning Thickness:-

                   1) we first,set up the mesh parameters like min.length,max.length and target element length using meshparameters option under the utilities tab as shown in the image given below.

                                 Fig 8. Mesh Parameters

                       2) After that we set up the Quality criteria according to the given values in the aim of using QUALITY   CRITERIA   option under the UTILITIES tab as shown in the image given below.

                                         Fig 9. Quality Criteria

                       3) In the 2-D meshing we will be considering only the above mid-surfaced parts and we will be meshing it with mixed elements that include both quad and tria elements according to the quality criteria given in the aim.

                       4) We start 2D meshing of the component region by region so we can obtain a better mesh flow as shown in the image given below.

                       5)  Quality failed elements are reduced as much as possible using RECONSTRUCT option in SHELL MESH          section and MOVE option in GRIDS section.

                       6)   The Quality Failed elements could not be cleared at Few regions Because of Triple cons present over there.

                       7)  We Finally get to see the completely meshed model as shown in the image given below.

                                          Fig 10.Mid surface of the Instrument Panel ( After Meshing )

                       8)  We then assign thickness to the meshed component by ticking the checkbox called " Draw shell as solid "       present in presentation parameters of quality criteria under the utilities tab as shown in the image given below.

                          Fig 11. Applying Draw shell as solid to the model.

                       9)   We Finally get the meshed model which is same as the Parent geometry as their respective PIDs have  the original thickess of the Parent geometry as shown in the image given below.

                                 Fig 12.Instrument Panel ( After applying Draw shell as solid to the model)

Conclusion:-

1) we have check the given CAD geometry for the geometrical errors and rectified them using checks geometry option.

2) we have generated mid-surface from the Parent geometry region by region so as to get a perfect mid-surface.

3) we have Performed 2-D meshing over the mid-surfaced geometry region by region and clearing all the quality errors to get a better mesh flow over the component.

4) Finally,we have assigned thickness to the model which matches the Parent geometry thickness.

Learning Outcomes:-

1) Taking mid-surface for complex geometry like dashboard.

2) Obtaining better mesh flow over the dashboard.

Model link:-

     https://drive.google.com/file/d/1l36HrhOQ2ta18lQtOS0hs8U4HC-VdETy/view?usp=sharing