Week 4 Challenge : CFD Meshing for BMW car

Aim:

• To perform a geometry clean-up on the given geometry of the BMW car.
• To assign different PIDs to different components.
• To create an enclosure of the given dimensions.

Methodology

• Geometry clean up:

1. The geometry was checked for single-cons and triple cones and bad surfaces
2. These errors were rectified by using the following commands.

• Delete: This was used to delete any entity which cause geometrical errors such as overlapping surfaces, Single and Triple coons.

• Extend: This is used to extend single coons to another face.

• Intersect: This is to intersect between two faces.

• New: This can create new faces between coons.

• Curve: To create a curve between two hot points.

• Project: To project a hot point from one edge to another.

• Fill hole: To fill a closed hot of a specified tolerance.

• Cut: To cut a face into parts

• Creation of enclosure:

1. To create an enclosure of defined dimensions around the car which defines the fluid region.

• Assigning PIDs

1. Each surface was defined with the respective PIDs, different PIDs assigned are given below,
1. Rear_enc
2. back_enc
3. Front_enc
4. side_enc
5. Top_enc
6. bottom_enc
7. Grill
8. Tyre
9. Logo
10. headlamp
11. Bottom grill
12. left Grill
13. Body
14. Brake lamp
15. Silencer
16. Glass
17. mirror

• Meshing

1. Initially, surface meshing was performed on different PIDs on the airplane whose target lengths are shown below
   1. Body - 3 mm
   2. Lights - 4 mm
   3. Grills - 1 mm
   4. Rims and Tyres - 2 mm
   5. Optical Rearview mirror - 2 mm
   6. Window - 2 mm
   7. Silencer - 3 mm
   8. Logo - 1 mm

• Volume detection

1. After performing the surface mesh, the volume of the fluid surface was detected by using the ‘AUTO-DETECT’ option under the volume meshing option.
2. The fluid volume was extracted

Conclusion:

The BMW car model was meshed in ansa after cleaning up the geometry and assigning different PIDs

Link: https://drive.google.com/drive/folders/1L5kEmE61aMBuHBuaWUTvXSdDMvEa5a5B?usp=sharing