Week 4 Challenge : CFD Meshing for BMW car
Aim:
To perform the geometrical clearance, assign appropriate PID'S and to perform meshing with given target length and element quality criteria.
Given :
Procedure:
1. Import the model and make topological clearance.
2. Divide the component into different level of element for the geometrical clearance.
3.Assign individual PID's
4. Perform cfd meshing by proper quality criteria.
Explanation:
1. Import the model and make topological clearance.
FILE ----> OPEN ----> Import the model given.
Click the shadow icon to full view:
to make the view and boundary much more clear decrease the resolution of the geometry.
To reduce the resolution two methods are there
1. TOOLS ----> SETTINGS ----> RESOLUTION /TOLERANCE/UNITS ----> Decrease the resolution of the geometry for the betterment view.
2. MESH DECK ----> PERIMETERS ----> LENGTH ----> Select the geometry ----> Define the length as 1 or necessary length to get the view better.
Since it is symmetrical, it is suggested for the geometrical clearance for one side and able to make a copy on the other side.
Delete the side with more errors for the feasible topological application.
DELETE ----> Select the symmetrical region delete the area.
with this individual clearance is made.
2.Divide the component into different level of element for the geometrical clearance.
Do geometry checks for the available model and identify the geometrical error and penetration error
CHECKS MANAGER ----> GEOMETRY CHECKS ----> EXECUTE
finds with error, those errors have to be rectified.
1. head light
Consider a head light as a component and need to rectify the errors in it
Triple cons and thickness of the head light are the major errors.
Using I NOT option segregate the head light and perform the topological error clearance and form the isolated image of the head light as below
complete solid of the head light is performed under geometrical clearance where its triple cons and single cons are get cleared.
Single and triple cons are deleted and inner surfaces are cleared in order to make refined mesh.
2. mirror
Now considering the mirror area.
converted into 
Remaining area is filled with new cons
TOPO DECK ----> FACES ----> NEW ----> CONS ----> SELECT THE BOUNDARY
Now consider the inner surface of the mirror to form hollow model in which refined mesh can be done.
PROJECT ----> SELECT THE SINGLE CON ----> SELECT THE SURFACE ----> project it.
DELETE ----> TRIPLE CON SURFACE ----> make it hollow.
3.front grills.
using I NOT option isolate the front grills
triple cons are deleted on the face side
converted into 
Next intersect the plane with the surface
INTERSECT ----> FIRST PLANE ----> SECOND PLANE ----> INTERSECT IT
Back side of the grills are suppose to be cleared
single cons are present at the fin side
project the single con to the surface and delete it completely.
TOPO ----> CONS ----> PROJECT ----> TO THE SURFACE ----> DELETE WHOLE SURFACE
By using the delete option delete the entire surface along with the missed one and create new surface.
front grills - 2
By using OR option isolate the front grill -2 for the geometrical clearance.
On viewing lot of triple cons are found and fins which are not intersected with back surface.
by using the delete option all the overlapping surface are deleted.
In a detailed view as like front grills, closed surface are needed so deleting the remaining surface
from this to 
In a detailed view there are some un even surface
TOPO DECK ----> FACES ---->CUT ----> Create a cut ----> NEW ----> PLANAR ----> Create a surface.
Fill the hole and create a new surface.
this can be merged to single surface.
next the same surface is there
CUT ----> Create a surface ----> FILL HOLE ----> Create a whole surface
Perform the same for the remaining fins
CUT ----> The extra surfaces ----> INSERT ----> CURVES ---->CONS TO CUURVES ----> Create a new surface.
Kidney grills :
By using the isolating options the front kidney grill of the BMW M6 is isolated and geometrical clearance is made.
Deleting the back portion of the grills to create the hollow model for refined mesh.
now create a whole surface in between same as like other two grills.
TOPO DECK ----> FACES ----> PLANE CUT ----> Select three hot points and delete the curved area.
Create a surface on the hollow area by using curves option.
TOPO DECK ----> CURVES ----> CREATE ----> NEW ----> COONS ----> SELECT THE SURFACE
BODY :
On viewing the body side , many single and triple cons are present which is not necessary and create geometrical errors.
converted into 
Delete the surface which is over lapped to form the triple cons.
In window area also there found some triple cons which has to be deleted.
followed by wheels, triple cons and geometrrical error surface are cleared.
Once the suface all around are cleared, the floor area is recreated by using cons to curve replicate the surface.
deleted and recreated .
All the floor area are recreated by using same cons to curve
CHECKS MANAGER ----> GEOMETRY CHECKS ----> EXECUTE.
Then clear the geometry errors of the BMW logo.
Perform geometry checks for the total model , once the penetration and geometry checks are cleared do symmetry and also assign PID'S.
After clearing it checks manager and inspect for the geometry and penetration checks.
Assign PID MANAGER for each of the component.
Then perform surface mesh for each pid for the respective target length
Surface mesh be --> CFD OR SPOT based on the feasibility.
Press HIDDEN and check for the OFF ELEMENTS and try to rectify it by RECONSTRUCT or SMOOTH.
Then by using TRANSFORM make SYMMETRY on three mirror point plane.
Create enclosure for the car profile based on the length of the car by using POINTS
Make Volumetric mesh for the enclosure and perform the mesh.
CONCLUSION:
Mesh for the car done and checked quality criteria for minimum and maximum length and also for skewness.
mesh parameters also checked.
LINK:
https://drive.google.com/file/d/1TpiROEbjL8tLvhZHAooOBc9vljBOUEEb/view?usp=sharing