Looking for essentially a surface shell drawing of an S30 chassis. All the talk of drag coefficients and such in one of the other current threads has made me want to see what would happen if I tried modeling one of our cars in one of the CFD (computational fluid dynamics) codes that I run every day. Might be fun in my "spare time" . Would need to be either a format that Pro/Engineer can read, or a generic IGES file exported from your CAD system that I can read into our finite element mesh generation code. Even a 2D elevation outline might be interesting. Our codes are 3D, but I can mock up a 2D slice around the car. I'm just not very good with CAD. Got other people to do that for me!

Anyway, just a thought :classic: .

I have chassis dimmensions you could use in my album here

You were talking about drag coefficients, and I'm not sure which thread you are refering to, but have you seen this page ?

!M!

  Mat73GNZ said:

I have chassis dimmensions you could use in my album here

You were talking about drag coefficients, and I'm not sure which thread you are refering to, but have you seen this page ?

!M!

I've got many/most of those drawings, but that still makes me do the CAD myself, which I am not skilled at. Once I have a CAD representation, I can mesh it in a variety of ways.

I tried the Aero URL but it can't be displayed for some reason. Sounds interesting, though .

What I'd like to play with doing would be essentially calculating the entire flow field around the car. Might be interesting to see what kind of turbulence is predicted behind it with our codes. We're always looking to find new simulations to do. We normally do solid propellant rockets, but we've done airplane wings, shock tubes, and even flow in an artery. I'd essentially set it up like a virtual wind tunnel and flow 70 mph air over it to see what happens. Expensive computer toys .

I may be able to do a CAD drawing for you. Ill need a side view of the car with visible dimensions on it, the one Mat73 has dimensions that are unclear. Or i guess I could also use a side view of the car period, but it would be very time consuming that way. Something that would also be very neat, would be to draw an S30 up in something like SolidWorks. I think making an "exact" CAD drawing might be teadious, but definately do-able

  mdbrandy said:

I tried the Aero URL but it can't be displayed for some reason. Sounds interesting, though .

Here it is without the hyperlink: http://zccw.org/Tech/Body/09-97EarlyZAerodynamics.html

Schevets, the drawings are clear if you click on them again to enlarge to the full size picture.

I, along with many others would love to see what you guys come up with!

!M!

  Mat73GNZ said:

Here it is without the hyperlink: http://zccw.org/Tech/Body/09-97EarlyZAerodynamics.html

Schevets, the drawings are clear if you click on them again to enlarge to the full size picture.

I, along with many others would love to see what you guys come up with!

!M!

Hmm. Still can't be displayed. Acts like it is loading, but then dies. Maybe your post has a lot of people looking at it now . Although there were only 24 views on this thread when I looked before, so you wouldn't think that would tax any server...

If anyone is interested in the kind of things I'm talking about, our website is www.csar.uiuc.edu. Kind of out of date right now, but still has some interesting stuff.

  Schevets said:

I may be able to do a CAD drawing for you. Ill need a side view of the car with visible dimensions on it, the one Mat73 has dimensions that are unclear. Or i guess I could also use a side view of the car period, but it would be very time consuming that way. Something that would also be very neat, would be to draw an S30 up in something like SolidWorks. I think making an "exact" CAD drawing might be teadious, but definately do-able

May73GNZ is right - if you click on them they get quite large and detailed.

If you want to do it, that's great - I was just wondering if anyone already had. I know I've seen people making illustrations of various Z's, but that's probably in paint-type packages and not CAD. Since I need surface descriptions, pixel images aren't useful. Have you ever saved anything in iges format before? We use Pro/E here, although I don't know much about it. Our CAD modeler then saves in iges so I can read the model into a program called Gridgen. It doesn't understand native CAD formats unless you pay more money :tapemouth .

Oo, we have AutoCad and AccuCad. I can check tomorrow to see if it saves in IGES format. Although by the way you are speaking it does not sound like it will, I am not familiar with the IGES format, I can look into it though. Your job appears to be very interesting

About those image sizes - I tried to save the regular sized ones to my desktop and zoom in and it didn't work. But when I clicked to make it larger it worked like you said

  Schevets said:

Oo, we have AutoCad and AccuCad. I can check tomorrow to see if it saves in IGES format. Although by the way you are speaking it does not sound like it will, I am not familiar with the IGES format, I can look into it though. Your job appears to be very interesting

About those image sizes - I tried to save the regular sized ones to my desktop and zoom in and it didn't work. But when I clicked to make it larger it worked like you said

IGES is a text-file generic CAD description specification that most CAD packages can save files in. HOWEVER, it is buggy, and iges files saved by one package may or may not work well in another. I've found that PRO/E can read iges files from most other packages, and then if I resave them from PRO/E, then Gridgen can read them. We also have Patran which can make, read, and save iges files, but not as well as PRO/Engineer.

Anyway, don't put yourself out too much. If you like doing stuff like this, go for it! I'd love to have the CAD description...

Thanks.

Sounds like an interesting idea. Once it is all off the ground it may be possible to run the car with a G-nose or a rear 'bre' spoiler to check the differences.

  speedyblue said:

Sounds like an interesting idea. Once it is all off the ground it may be possible to run the car with a G-nose or a rear 'bre' spoiler to check the differences.

Yup, especially if I use unstructured grids, they aren't too hard to change. The hardest part is getting the base description right.

Why not scan Line art in and use a scalar to vector converter?

Swapping from jpg, gif, tip or even psd to DFX or anyother vector format is a very simple thing-I think R10 and newer have the converter as part of the package-if not there are shareware converters readily available.

Will