Week 4 Challenge : CFD Meshing for BMW car

Aim: solve all geometrical errors and meshing with the given Target length and element Quality criteria forgiven model.

procedure:

step1:

* check the units.

*change the resolution perameter as 1mm because the geometry is not in properly distracted.

step 3:

Geometric Simplification,due to the symatric shape of geomatry ,can delete the half part and the cleare the errors and mesh the half part and then ,can mirror it.

step 4:geometric check

clearing the errors one by one parts,

started with grills .

clearing errors in body

clearing the errors in rims and tyers

clearing errors at logo

after the clearing the all geomatric errors

here i used the project ,cut ,plane cut ,create hot point tools.

At the handle of door , to extand the face i use the project cut>cut in exact require angle and then cut the exter part .

For the foolring ,created the refrence curve for the surface.

step 5:giving the PIDs

.

step 6:learnt about the skewness ang Quality criteria

giving the min length -0.1mm

max length -7mm.

step7:

meshing the grills and logo with TL-1mm and clearing the off elements. by reconstruct the elements

right click>improve>reconstruct>ok

meshing the window,mirror and rims and tyres with TL-2mm

meshing the body and Silencer with TL- 3 mm

meshing the lights with TL -4mm

step 8:

mirror the half part except the logo

transform>copy>symmetric>three points>finish>ok

cheking the geometric errors and the cleare the errors

step 9:mesh view of the geometry

step 10:

• creating the wind tunnel volume
• considering the length of car as X
• first creating the point bottom of the car with 200mm
• creating the point with reference to the middle point at front side with 4x length and back side of car with 6x.
• creatingthe another two points with reference to the front and back points with (half body length +x) lengthh same in opposite direction.
• creat the curve for created points and then make a face .
• create the top face with 3x from top of car surface.
• create the side face.

mesh the bottom face with TL=20mm

top face withTL=100mm

create the growing mesh for the side faces(spacing>manual>dstart as 20>dlimite as100).

Result:

understand the quality criteria and creating the wind Wind tunnel surfaces.https://drive.google.com/drive/folders/1-2bpiKQdwiGkFSHYS677LeHt8vlt2N2x?usp=sharing