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Old 03-17-2009, 10:11 AM   #1 (permalink)
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Needed: CFD analysis on a SolidWorks assembly drawing

Unfortunately I have no way to perform a CFD on my assembly since I don't have access to FloWorks (the part of Solidworks that does CFD). So I am hoping to either find some free software that can perform the CFD from my .sldasm file or someone to perform the CFD for me to determine my project's Cd.

If you want to see screenshots of the project visit the Fossil Free forum for the post that involves my custom EV build or visit the blog in my signature.

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Old 03-17-2009, 04:59 PM   #2 (permalink)
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I've got solidworks and floworks, I'll do the calculations if you want.

I should add I am a beginner, so if you let me know exactly what you need doing I'll be happy to give it a go.
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Old 03-17-2009, 05:10 PM   #3 (permalink)
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Awesome Dave!

I still need to clean things up and finish the rear of the vehicle. I also want to figure out how I can direct air around the wheels efficiently, so probably in a week I will try and hit you up on that offer and I'll send you a zip file of the whole assembly.

Here's some eye candy from PhotoWorks.



I just started playing with those tools today so I'm pretty limited on what I've been able to do with that so far. It takes my computer about 4-5 images to render the images in Photoworks, but I think they will come out really nice once I learn all the in's and out's of that program.
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Old 03-17-2009, 05:20 PM   #4 (permalink)
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My friend made a fairly basic model of his Polo and it takes about an hour to do the calculations in FloWorks, and that's on my workstation (8 x 2.83Ghz).

Once I've worked out why I don't receive an email on new posts I'll look out for your reply.
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Old 03-17-2009, 05:23 PM   #5 (permalink)
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analysis

If you bear in mind VW's 1-liter car you could easily reach Cd 0.15.If you move the wheels out away from the chassis,mono-posto style and carefully fair in all suspension and wheels,you might squeeze Cd 0.11 as with Sylph.Go to the fish section of your supermarket and buy a frozen mackerel.You can take all your dimensions from that and scale it up.
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Old 03-17-2009, 05:56 PM   #6 (permalink)
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I'm worried that putting the wheels on outriggers will increase the frontal area in way that is not offset by the decrease in Cd.

Thoughts?
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Old 03-17-2009, 06:09 PM   #7 (permalink)
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outriggers

Quote:
Originally Posted by Blue Bomber Man View Post
I'm worried that putting the wheels on outriggers will increase the frontal area in way that is not offset by the decrease in Cd.

Thoughts?
It is an issue,although it does widen the tripod base for the rig.The Sylph won't tip,is very stable as reported and at Cd 0.10-11 ( windtunnel at JPL I think ) approaches the lower limit for Cd in ground-effect.------------------------------------------------------------------- I'm running an old air-cooled VW torsion-bar double-tube setup on my Frankensteinian mini-Hypercar project.I'll pay a penalty in Af,but it will also stand up to the monster pot-holes around here,and if I get slammed at the front in a wreck,may save my bacon.-------------------------------------- You've got the right idea with the two-up front,single rear trike,as it provides the greatest potential for drag reduction.-------------------------------------------------- I like your graphics,keep us up-dated.
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Old 03-17-2009, 06:33 PM   #8 (permalink)
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I will have to think about it once I get a better idea on how my current build performs. The idea is to keep all costs down, so I certainly make all efforts to improve aerodynamics so that I can keep the drivetrain costs down. I think that having the wheels on outriggers and then trimming them out so that they are aerodynamic could be a bit cost prohibitive, but I think I will definitely play around with it when I get more fluent in Solidworks.

Good chance I will look into a larger 4-wheel design with fully inclosed wheels that has a bit more ground clearance then this design where the wheels will almost be like on stilts, kinda like Aptera's rearwheel except for all 4.
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Old 03-17-2009, 06:45 PM   #9 (permalink)
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Quote:
Originally Posted by Blue Bomber Man View Post
I will have to think about it once I get a better idea on how my current build performs. The idea is to keep all costs down, so I certainly make all efforts to improve aerodynamics so that I can keep the drivetrain costs down. I think that having the wheels on outriggers and then trimming them out so that they are aerodynamic could be a bit cost prohibitive, but I think I will definitely play around with it when I get more fluent in Solidworks.

Good chance I will look into a larger 4-wheel design with fully inclosed wheels that has a bit more ground clearance then this design where the wheels will almost be like on stilts, kinda like Aptera's rearwheel except for all 4.
Blue Bomber Man,did you ever see a photo of the 3-wheeler that Doug Maleweicki (sp?) was putting together for his "One tank across America" attempt? It's pretty tasty and exhibits a creative front end with very low cross-section to enclose suspension/steering/wheels.It's worth a look.
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Old 03-17-2009, 07:00 PM   #10 (permalink)
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I'll look it up =)

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