Week 4 Challenge : CFD Meshing for BMW car

In this model first we opened the model,i seen in this geometry so many single cone and triple can are there, then we started to do topological cleanup one by one. after that i applied topo full model so many single cones and triple cones are cleaned. after that i seen some features are not in good shape then we started to do good shape i used fine option in that one small part like Optical Rear view mirror. after used it's came good shape. but it was little bit long process. after that we used in mesh there is a option called length, in that one i given perimeters 1 mm and macros also 1mm to full body. after that we got full body in good shape. in this model full body was symetry , so i deleted half part to complete the model easily and after completion we can do symetry half part to another side.after deleting we started the geometry clean up one by one.

First we started with grill part we seen some inside triple cone are coming so i deleted that inside feature, then we seen triple cones in that part clear. we need outside features, we don't need inside that features which one is creating triple cones inside the car. so we deleted one by one.after that we seen some single cones in grill part then we started to fix it. one by one we fixed that one. then we go for next part logo, in that part we seen there also single nd triple cones is there then we started to fixed it.after that we go for next part window's we seen there also same like some triple cones are there then we deleted inside part then it was fixed.then we seen some outer body part some triple cone's are coming we deleted inside part , then that one also we fixed.after that we go for next part Optical Rear view mirror there also some single and triple cone's are there then , we started to fixed it. after that we fixed sliencer and tyres also, after completion that all but we seen downside surface are some single and triple cones are there some overlaped surface we deleted because of its created triple cone's there and some surface deleted after that we created that one. after we fixed everything we checked geometry check then we got outer part was single cone's are showing.

After completion of topological clean up we started for pid assigning, then we assigned one by one pid. after that we started to do mesh one by one. First we started with grill part we given the mesh parameters like target length is 1 mm and mesh type tria and min. length 0.4 and max. length 2 then we given quality criteria like min length 0.4 and max length 2 mm.after that we go for mesh then we given in length perimeters 1mm and macros 1 mm . after that we did spot mesh and visible. then we seen mesh was generated perfectly. after that we offed shadow mode and we checked with ENT type then we got some off element after that in shell mesh the option called reconstruct in reconstruct we did visible then we got some less no off element again we checked with topo clean up then we fixed that one again we did meshed then we did reconstruct after that we seen our off elements was zero.

Then we go for next part like logo because of our target length was same then we double checked mesh parameters and quality criteria after that we given perimeters 1mm and macros 1 mm then we did spot mesh visible then we got some off element after that we did reconstruct then we got off element was zero.

After we go for next part like lights in that one we given the mesh parameters target length 4mm and mesh type tria. then we given quality criteria min length 3 mm and max length 5 mm. then in mesh we given length perimeters 4 mm and macros 4 mm then we did spot mesh visible then we got some off element then we did reconstruct after that the off element was came less then we started to fixed it.then checked topo mode we seen some geometrical problem then we fixed it. then again we did mesh then we did reconstruct after that we got our off element was zero.

After that next part like Silencer in that one we given the mesh parameters target length 3mm and mesh type tria. then we given quality criteria min length 2mm and max length 3mm. then we given in mesh length perimeters 3mm and macros 3mm then we did spot mesh visible then we got some off element then we did reconstruct after that the off element was came zero.

After we go for next part like Window in that one we given the mesh parameters target length 2mm and mesh type tria. then we given quality criteria min length 1mm and max length 3mm. then in mesh we given length perimeters 2mm and macros 2mm, then we did spot mesh visible then we got some off element then we did reconstruct after that the off element came zero.

After we started next part like Optical Rear view mirror in that one we given the mesh parameters target length 2 mm and mesh type tria. then we given quality criteria min length 0.4 mm and max length 3 mm. then in mesh we given length perimeters 2mm and macros 2mm then we did spot mesh visible then we got some off element then we did reconstruct after that the off element was came less then we started to fixed it.then checked topo mode we seen some geometrical problem then we fixed it. then again we did mesh then we did reconstruct after that we got our off element was zero.

After we started the next part like Rims and Tyres in that one we given the mesh parameters target length 2 mm and mesh type tria. then we given quality criteria min length 0.4 mm and max length 3 mm. then in mesh we given length perimeters 2mm and macros 2mm then we did spot mesh visible then we got some off element then we did reconstruct after that the off element was came less then we started to fixed it.then checked topo mode we seen some geometrical problem like some unwanted cut was there then i started to fixed it. then again we did mesh then we did reconstruct after that we got our off element 4 to 5 then we started to fixed those one, to fixed that one we used in Grids option called move . we manually started to move those trias, which one is failing by skewness, min. length and max. length. then we started to do manually fixed then we got off element zero.

After we started the next part like Body in that one we given the mesh parameters target length 3 mm and mesh type tria. then we given quality criteria min length 0.4 mm and max length 5 mm. then in mesh we given length perimeters 3mm and macros 3mm then we did spot mesh visible then we got some off element then we did reconstruct after that the off element was came less then we started to fixed it.then checked topo mode we did geometrical clean up like some unwanted cut was there then i started to fixed it. then again we did mesh then we did reconstruct after that we got our off element 11 then we started to fixed those one, to fixed that one we used in Grids option called move . we manually started to move those trias, which one is failing by skewness and max. length. then we started to do manually fixedthen we got off element zero.

After completing that one we started the half body to symetry another side then we used option called symetry then we did copy after we copy full body then we did middle click after that three co-ordinates we slected then we did middle click then we got full body.after getting full body again we checked geometry checked then we got 3 single cone's then we started to fixed it. after fixing those single cone's. then we did started for wind tunnel.

After completing of all those we started to create a wind tunnel. For creating wind tunnel, we need some point then we go for topo mode in there option called relative. in that option we created some point's after that with the help of point again we created some curves. after that in that curve we create surface the bottom surface. we started to create top surface then we did offset surface then we got bottom surface with the help of bottom and top surface we create side surface and also front and rear surface . after that we asigned the pid . then we started for surface meshing. for bottom surface we given the mesh parameter target length 20mm and mesh type tria.then we given quality criteria min length 15mm and max length 25 mm. then in mesh we given length perimeters 20mm and macros 20mm then we did spot mesh visible after that we got fine meshed. Again for top surfacewe given the mesh parameter target length 100mm and mesh type tria.then we given quality criteria min length 80 mm and max length120 mm. then in mesh we given length perimeters 100mm and macros 100mm then we did spot mesh visible after that we got fine meshed.after that we can for side wall mesh and rear and front. for that first we given option called in that one biasing type geometry , factor given 1.1, Dstart given 20 and Dlimit given 100 after that we did apply. then we given mesh parameters target length local after that we did meshed one by one side surface and front and rear surface.after completing we go for volumetric mesh , in that one option called define after that we have to select whole db then we got volume box in that one we need full body with wind tunnel for volumetric mesh remaing which one no need we have check manually and delete after that we started for volumetric mesh.