LocostUSA.com

That's exciting! It's a big hurdle to get any results. Now things will just get better.

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Marcus Barrow - Car9 an open design community supported sports car for home builders!
SketchUp collection for LocostUSA: "Dream it, Build it, Drive it!"
Car9 Roadster information - models, drawings, resources etc.

I'm not that far along, John. My results are useless at this point. I need to run a sphere or something I can easily mesh for a test to know what the problem is. Typical testing is supposed to take a day or so where mine took about 2 hours. Garbage in, garbage out as they say!

I wasn't sure anybody besides Shaw was interested.

I'll keep trying.

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Miata UBJ: ES-2074R('70s maz pickup)
Ford IFS viewtopic.php?f=5&t=13225&p=134742
Simple Spring select viewtopic.php?f=5&t=11815
LxWxHt
360LA 442E: 134.5x46x15
Lotus7:115x39x7.25
Tiger Avon:114x40x13.3-12.6
Champion/Book:114x42x11
Gibbs/Haynes:122x42x14
VoDou:113x44x14
McSorley 442:122x46x14
Collins 241:127x46x12

Excellent progress! If you want to send me the CAD, I can run a low def model on my setup.

I'll be honest, though, you've really got me thinking about an openfoam setup...

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http://www.linkedin.com/in/shawengineering

i always keep a watchful eye on your stuff, just because its always interesting to me

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this story shall the good man teach his son,
and chrispin chrispian shall ne'er go by,
from this day to the end of the world.
but we in it shall be remembered.

I try to keep it interesting.

Shaw, can you use my files as skp? I found that I didn't need to convert them separately to work with these programs.

I setup for 40 meters per second with hexahedral (trim) type mesh but my end values are virtually non-existent. Boundary conditions on the inlet also set to 40 m/s, slightly tighter mesh on the body, 500 interations. Lots of other variables that take a lot of time to run separately.

There is a blunt body component that I should have run first, to know all this stuff is setup properly. That is my next step.

_________________
Miata UBJ: ES-2074R('70s maz pickup)
Ford IFS viewtopic.php?f=5&t=13225&p=134742
Simple Spring select viewtopic.php?f=5&t=11815
LxWxHt
360LA 442E: 134.5x46x15
Lotus7:115x39x7.25
Tiger Avon:114x40x13.3-12.6
Champion/Book:114x42x11
Gibbs/Haynes:122x42x14
VoDou:113x44x14
McSorley 442:122x46x14
Collins 241:127x46x12

MV8, is this stuff all running on one platform (like Windows) for you or are you mixing and matching things using virtual machines and OS's?

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Marcus Barrow - Car9 an open design community supported sports car for home builders!
SketchUp collection for LocostUSA: "Dream it, Build it, Drive it!"
Car9 Roadster information - models, drawings, resources etc.

I'm mixing and matching.

Third party tools and solvers, some windows based, some not but they work in windows through another third party "adapter" for lack of a better term, then setup within a plugin that only works on older versions of sketchup that are no longer supported. The good part is it's all open source.

_________________
Miata UBJ: ES-2074R('70s maz pickup)
Ford IFS viewtopic.php?f=5&t=13225&p=134742
Simple Spring select viewtopic.php?f=5&t=11815
LxWxHt
360LA 442E: 134.5x46x15
Lotus7:115x39x7.25
Tiger Avon:114x40x13.3-12.6
Champion/Book:114x42x11
Gibbs/Haynes:122x42x14
VoDou:113x44x14
McSorley 442:122x46x14
Collins 241:127x46x12

MV8,

Ya, skp is fine.

Are you using openFOAM designer? I've been playing with it this past week on my 32-bit XP box. Works great, but I haven't tried a CAD import yet, just been doing the tutorials...

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http://www.linkedin.com/in/shawengineering

I'm using BlueCFD single core. Open Foam is built in.
Tried to pm you the file, but the extension skp is not allowed.
PM me your email address and I'll try that.

_________________
Miata UBJ: ES-2074R('70s maz pickup)
Ford IFS viewtopic.php?f=5&t=13225&p=134742
Simple Spring select viewtopic.php?f=5&t=11815
LxWxHt
360LA 442E: 134.5x46x15
Lotus7:115x39x7.25
Tiger Avon:114x40x13.3-12.6
Champion/Book:114x42x11
Gibbs/Haynes:122x42x14
VoDou:113x44x14
McSorley 442:122x46x14
Collins 241:127x46x12

It is working now. I was on time step zero, so there were no iterations being displayed. Thanks to Julien de Charentenay for pointing this out.

I still have a lot of clean up to do on my model. I can also setup points to monitor lift and downforce.

_________________
Miata UBJ: ES-2074R('70s maz pickup)
Ford IFS viewtopic.php?f=5&t=13225&p=134742
Simple Spring select viewtopic.php?f=5&t=11815
LxWxHt
360LA 442E: 134.5x46x15
Lotus7:115x39x7.25
Tiger Avon:114x40x13.3-12.6
Champion/Book:114x42x11
Gibbs/Haynes:122x42x14
VoDou:113x44x14
McSorley 442:122x46x14
Collins 241:127x46x12

Worked on the model some more. Note the inverted surfaces down the center I need to correct and end result won't have such a long tail, but already low drag and lift with a range of +0.128 psi (red) to - 0.067 psi (blue) at 89 mph. Of course, the suspension is incomplete, there are no gaps between the rear tire and the body, wheels are not turning, and the entire car is off the ground.
Blue areas indicate separation/vacuum/low pressure created. No matter how good the design, the color scale ranges from blue to red so red isn't necessarily a bad thing, and the range and colors are adjustable.

_________________
Miata UBJ: ES-2074R('70s maz pickup)
Ford IFS viewtopic.php?f=5&t=13225&p=134742
Simple Spring select viewtopic.php?f=5&t=11815
LxWxHt
360LA 442E: 134.5x46x15
Lotus7:115x39x7.25
Tiger Avon:114x40x13.3-12.6
Champion/Book:114x42x11
Gibbs/Haynes:122x42x14
VoDou:113x44x14
McSorley 442:122x46x14
Collins 241:127x46x12