Project 1 - 2D meshing on the instrumental Panel

2D Meshing on the Instrumental Panel:-

Aim:-

To determine the component checks for geometrical errors and providing good mesh flow for each elements in the model by satisfyong above all given criteria with a thickness assignment from shell to solid. Additionally, below requirements also should be satisfied respectively.

• OFF elements after enabling criteria should be mnimized.
• Cyclic quads and opposite trias should be diminished from model.
• Good mesh flow.

Procedure:-

1. Open the ANSA Software.

2. Click on the downloaded Dash Board and open it.

3. As the model will appear. Use the command 'TOPO'(Faces>TOPO) and do window selection for all the model.

• After the TOPO cleanup, then we have to check the geometrical errors for further steps of MID-Surfacing.
• Firstly, we have to click on the 'Geometry' in the 'Checks Manager'(Tools>Checks>Geometry), then an Auto-generated template will be occured.
• Secondly, after displaying the template, likewise we have to click on the 'Execute' option in the template which will displayed the status of error visibility.

• Then, after displaying errors, we can 'auto-fix' this error. Select all the errors and by right clicking 'fix' option will be generated and by click on it auto-fix error will automatically be resolved. After, auto-fixing this error some of the errors should be fixed by our own. Thus, these errors should be resolved one after another. For this, we have to use 'Hybrid Not'(Bullens>Hybrid Not) option.
• Admittedly, these errors should be resolves sequence by sequence, so click on error and go to the option 'show only' then the error will be displayed. Likewise, go to Release(CONS>Release) option, then by clicking on it and doing window selection of TOPO in faces, our error will be resolved respectively. Similarly, we have to resolved all errors one by one.

• Thus, when all errors are resolved, then in template it will shown geometry check status as 100% which clarify that our geometrical errors along with Topology cleanup is all up to the mark.
• Therefore, our geometry is now ready for MID-Surfacing.

4. Our geometry is now undergo through MID-Surfacing. Basically, we preferred mid-surfacing to get a better mesh flow by converting solid to shell(2D). Now, for mid-surfacing we have to 'Set PID'(Ctrl+P) for each elements of the model. Accordingly, we have to set various colour orientations for each elements in the model. Now, different elements is showed below-

1. PShell_0.6mmt :-

1. Select on Pshell_0.6mm and by right clicking to 'show only' option, it will depicts the Pshell_1 part.
2. Now, we have to do mid-surfacing. Here, we can use option 'Auto Mid-surfacing'(Faces>Mid-surfacing>Skin). By doing window selection and by clicking middle mouse button the automatic offset will be generated and then our mid-surface for the given part will be generated.
3. Now, our FE model, is now ready for meshing. Before that, we need to follow some protocols, likewise primarily one of its distance between nodes at perimeter and macros. We have to measure distance and like, we have to focus to attain a same distance between nodes as well as cons.

4. Basically, we need to assign constant distance between cons, so we need to use 'Length'(Perimeters>Length) option and we have to assign average thickness as '4 mm' as perimeter and macros. Then, our FE model has achieved uniformity in cons. Likewise, two protocols also we have to follow i.e. 'Number'(Perimeters>Number) and 'Slide'(Perimeters>Slide). Now our model is ready for meshing.

5. Additionally, we have to move towards meshing. Primarily, we have prefered 'Best'(Mesh generation>Best) mesh option for meshing. Similarly, we have to do meshing as part by part so we need to make 'Project cut'(Macros>Project cut) to divide the surface and likewise, we have to the mesh as part by part.

6. Before that, we have to set mentioned quality criteria as per given data. So, click 'F11' a template will be generated, then we have to select required quality parameters as per assigned. then, for same we have to click 'Presentation Parameters' in the template and we have to click on the 'elements' option and we have to show the same 'Demand effect' arrow.

7. After that, we have to click 'Mesh'(Utilities>Mesh) option and we have to set average, maximum and minimum length. Then, we have to do best mesh one part after another. Simulataneously, we have to use two commands 'Reconstruct'(Shell mesh>Reconstruct) and 'Smooth'(Shell mesh>Split), Paste(Grids>Paste), Join(Elements>Join), Num+/- (Perimeters>Num+/-), Swap(Elements>Swap).

8. As, after doing all, the part will appeared in meshing.

9. Thus our objective is achieved. So, part PShell_0.6mmt can be viewed in 'PID' mode for its colour orientation.

b. Pshell_2mmt :-

1. Select on Pshell_2mm and by right clicking to 'show only' option, it will depicts the Pshell_2 part.
2. Now, we have to do mid-surfacing. Here, we can use the option 'Manual Mid-surfacing'(Offset>Faces). Here, we can't do Auto-midsurfacing as variable thickness is present over the surface. Then, click on the top surface and measure the thickness simultaneously and gives offset for that surface, manual mid-surface will be generated. Additionally, we have to use the Middle (Faces>Middle>Single) option for generating Midsurfacing.
3. Now, our FE model, is now ready for meshing. Before that, we need to follow some protocols, likewise primarily one of its distance between nodes at perimeter and macros. We have to measure distance and like, we have to focus to attain a same distance between nodes as well as cons.
4. Basically, we need to assign constant distance between cons, so we need to use 'Length'(Perimeters>Length) option and we have to assign average thickness as '4 mm' as perimeter and macros. Then, our FE model has achieved uniformity in cons. Likewise, two protocols also we have to follow i.e. 'Number'(Perimeters>Number) and 'Slide'(Perimeters>Slide). Now our model is ready for meshing.

5. Repeat the same steps 5,6,7,8 as point (a) for meshing. Then, our part will be appeared in meshing.

6. Thus our objective is achieved. So, part PShell_2mmt can be viewed in 'PID' mode for its colour orientation.

c. PShell_0.7mmt :-

1. Select on Pshell_0.7mm and by right clicking to 'show only' option, it will depicts the Pshell_3 part.

2. Now, we have to do mid-surfacing. Here, we can use the option 'Manual Mid-surfacing'(Offset>Faces). Here, we can't do Auto-midsurfacing as variable thickness is present over the surface. Then, click on the top surface and measure the thickness simultaneously and gives offset for that surface, manual mid-surface will be generated. Additionally, we have to use the Middle (Faces>Middle>Single) option for generating Midsurfacing.

3. Now, our FE model, is now ready for meshing. Before that, we need to follow some protocols, likewise primarily one of its distance between nodes at perimeter and macros. We have to measure distance and like, we have to focus to attain a same distance between nodes as well as cons.

4. Basically, we need to assign constant distance between cons, so we need to use 'Length'(Perimeters>Length) option and we have to assign average thickness as '4 mm' as perimeter and macros. Then, our FE model has achieved uniformity in cons. Likewise, two protocols also we have to follow i.e. 'Number'(Perimeters>Number) and 'Slide'(Perimeters>Slide). Now our model is ready for meshing.

5. Repeat the same steps 5,6,7,8 as point (a) for meshing. Then, our part will be appeared in meshing.

6. Thus our objective is achieved. So, part PShell_0.7mmt can be viewed in 'PID' mode for its colour orientation.

d. PShell_2.5mmt :-

1. Select on Pshell_2.5mm and by right clicking to 'show only' option, it will depicts the Pshell_4 part.

2. Repeat the same steps 2,3,4 as point (c) for Midsurfacing. Thus, part will be displayed.

3. Repeat the same steps 5,6,7,8 as point (a) for meshing. Then, our part will be appeared in meshing.

4. Thus our objective is achieved. So, part PShell_2.5mmt can be viewed in 'PID' mode for its colour orientation.

e. PShell_3mmt :-

1. Select on Pshell_3mm and by right clicking to 'show only' option, it will depicts the Pshell_5 part.

2. Repeat the same steps 2,3,4 as point (c) for Midsurfacing. Thus, part will be displayed.

3. Repeat the same steps 5,6,7,8 as point (a) for meshing. Then, our part will be appeared in meshing.

4. Thus our objective is achieved. So, part PShell_3mmt can be viewed in 'PID' mode for its colour orientation.

f. Lastly, our motive for the good mesh flow is achieved. Similarly, we can showcase the mesh model with selecting the 'Bounce' option and deselecting the 'Perims points' option. Like, mesh model will be appeared along with trias percentage and minimal OFF elements.

g. As, for same requiement we showcase the model as option for 'Shell as Solid.' Thus our objective is achieved.

Learning Outcomes:-

• Understanding the commands in 'Topo' and 'Mesh' mode and get to know the basic knowledge and difference of shell and solid mode.
• Learnt the concept of Manual and Auto Mid-surfacing along with trias, quads and Off elements.
• Understanding the concept of quality parameters and mesh paramters like target, minimum and maximum length etc.
• Lastly, how to review the 2D CAD model and how to resolve it, that keen understanding has been learnt.

Conclusion:-

In this model, we have finally achieved a good mesh flow, along with minimal 'OFF' elements, by resolving all geometrical errors along with the Topology clean-up, by satisfying all quality criteria as per mentioned above and by reducing trias percentage as below 15% as per given condition. Atlast, our model is mesh with a good mesh flow.

Google link:-

https://drive.google.com/file/d/1FHL5dOlzb6flZ2NZhcPbVwpGlYJBY5sZ/view?usp=sharing