Week 4 Challenge : CFD Meshing for BMW car
WEEK 4 CHALLENGE DETAILED REPORT
Introduction:
Here we done the surface meshing of a BMW car with windtunnel.Different target lengths used for diffrerent parts.Windtunnel also created as per the dimesions.
Aim:
*For the given BMW car model,check and solve all geometrical errors on half portion and Assign appropriate PIDs.
*Perform meshing with the given Target length and element Quality criteria.
*After meshing the half model, Do symmetry to the other side.
Procedure:
(1) Download the given geometry file of BMW car to our system.
(2) Open the geometry file in Ansa software.
The above figure shows the full geometry when open in the Ansa.
(4) On the PID mode and check the geometry how it looks.
(5) Then do a TOPO for full the geometry for the correction of simple errors.
(6)When checking properly , I could see that the tyres are not in proper manner.
(7)I changed the resolution for correcting the geometry of tyres and other distorted parts.
(8)After changing the resolution, the cons are correceted and reshaped as seen below:
(9) After that I done checking for single cons.
(10) Then I done checking for tripple cons.
(11)Then I deleted half portion of the geometry for the easyness of the further process. Beacuse of the symmetry of the geometry I could delete the halfportion.
(12)Then I checked the half portions of the geometry with all cons on.
(13) Then I done the first geometry check for seeing the errors.
(14) It shows many geometry and penetration errors.
(15) Then I started to correct the errors by isolating each parts.
(16) So, for that purpose 1st I isolated the Grill 1.
(17) Then I deleted some unwanted surfaces.
(18) Then I could see some misalignment in that grill and some more unwanted surfaces.
(19) Then for the correction of errors I projected some cons.
(20) Again I changed the resolution and deleted some extra surfaces.
(21)Then I created some new surfaces also.
(22) For the correction purpose again I projecetd some cons and deleted some unwanted surfaces as seen below.
(23)Then also I changed the resolution, deleted some tripple cons and unwanted surfaces.
(24) Then I created some new surfaces.
(25) Like this way I finished the geometry cleanup of Grill 1.
GEOMETRY CLEANUP OF 2nd GRILL:
(26) For the geometry cleanup of 2nd grill I checked that from inside and isolated that one.
(27) I created some hot points.
(28) I used CUT option for isolating the surface.
(29)I assigned this grill as new PID and created some surfaces.
(30) Then I deleted some unwanted surfaces also.
(31)Like this way I finshed the geometry clenup of 2nd grill.
GEOMETRY CLEANUP OF 3rd GRILL:
(32) For the geometry cleanup of 3rd grill I isolated that grill.
(33) For the correction purpose I deleted some unwanted surfaces and created some faces.
(34) The I used plane cut option.
(35) Then I projected cons everywhere and deleted some unwanted surfaces.
(36) Then I found only one inetersecting error left.
(37) Like this way I done the geometry cleanup of 3rd grill also.
GEOMETRY CLEANUP OF LIGHT:
(38) For the correction purpose I seperated light from the other part and done gemetry cleanup.Finally I cleared all the errors in the light.
GEOMETRY CLEANUP OF MIRROR:
(39)For the correction purpose I seperated MIRROR from the other part and done gemetry cleanup.
(40) I changed mirror as a single volume.
(41)Like this I finished the geometry cleanup of MIRROR.
GEOMETRY CLEANUP OF SIDEGLASS:
(42)I isolated glasses of BMW car and done geometry cleanup.
(43) Then I cleared some intersection errors and geometrical errors in side parts.
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GEOMETRY CLEANUP OF LOGO:
(44) For geometry cleanup I isolated logo and then done cleaning.
(45) Like this way I cleaned logo also.
GEOMETRY CLEANUP OF TYRES:
(46) Then I isolated tyres and cleaned the errors.
(47) After this much cleanup I done a geometry check and it showed one geometrical error and three intersection errors
(48) For correcting that errors I deleted some unwated surfaces.
GEOMETRY CLEANING OF FLOOR:
(49) For the error correction purpose I created some new surfaces also.
(50) Deleting curves.
(51) After this much corrections, again I done geometric check.
(52) Then it shows one penetration error and two geometrical errors and again I correcetd it.
(53) Like this way I completly removed all errors.
(54) Then I assigned PIDs for all parts.
SURFACE MESHING OF GRILLS AND LOGO:
(55) For doing mesh, I isolated three grills beacuse it has same target length.
(56)SURFACE MESHING OF TYRES AND WINDOWS:
(57) Like this way, I completed the surface meshing of half geometry.
(58) Then I done mirroring of that half part and done a geometric check and it shows no errors.
CREATION OF WINDTUNNEL:
(59) Then I started to create a wintunnel based on the dimensions.
(60) For that purpose I created midpoint and some points in the front,back and sides of that car.
(61) Then based on that points I created surfaces.
(61) Like this way, I completly created a wintunnel.
SURFACE MESHING OF WINDTUNNEL:
(62) Finally, I done the surface meshing of that windtunnel with target length with bottom face 20 and top face 100 with spacing.
(63) Like this way, I completly done the surface meshing of windtunnel also and I completed the week 4 challenge.
LEARNING OUTCOMES:
* Learned how to do geometry cleanup of different parts with different tools.
* Learned how to do surface eshing with different target length and quality criteria.
* Learned how to do create a windtunnel based on the dimensions of geometrt.
* Learned how to do surface meshing windtunnel with spacing.
RESULTS:
* Done geometry cleanup of BMW car.
* Done surface meshing of BMW car with different target length and quality criteria.
* Created a windtunnel based on the dimensions of geometry.
* Done surface meshing of windtunnel with spacing.
CONCLUSION:
* In conclusion, I learned many things from this challenge. Done geometry cleaning of BMW car with different tools, surface meshing of car done with different target length and quality criteria and finally created a windtunnel based on the dimensions on geometry and that also surface meshed.
NOTE: Completed geometry file attached here as google link.https://drive.google.com/file/d/1Ff6s6-1H0KIQTyZScxQ0yS2mHz_mOoyL/view?usp=sharing