03-30-2013, 12:56 PM
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#71 (permalink)
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Master EcoModder
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It appears the spoiler is mounted too far forward. I would look at putting it on the radius of the trunk at a shallow angle. Some work under the trunk might help as well.
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03-30-2013, 01:56 PM
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#72 (permalink)
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eco....something or other
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The pics are not from falcon. It doesn't seem to work right for me. Maybe there is an update or something. I have been using flow illustrator.
I will be installing a belly pan, so the bottom will be fine. I think just taking the spoiler off will give some good results. I will tuft/streamer test to find out. 6-8 feet of yarn should work nicely.
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03-31-2013, 02:18 PM
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#73 (permalink)
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Eco Sol
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Quote:
Originally Posted by IsaacCarlson
I think just taking the spoiler off will give some good results.
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Agreed. Raised spoilers are a waste. Mostly just good for drag and downforce. Conservative drivers that arent going 200+mph need neither.
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03-31-2013, 04:09 PM
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#74 (permalink)
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Master EcoModder
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Quote:
Originally Posted by Shortie771
Agreed. Raised spoilers are a waste. Mostly just good for drag and downforce. Conservative drivers that arent going 200+mph need neither.
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Aerodynamically generated downforce (and associated drag) can be felt in my pick-up truck (spoiler fitted) at as low as 35 MPH.
I don't need to attempt a 200 MPH run on a salt flat to appreciate the extra downforce and therefore safety this brings me on the street.
On a winding road which is wet and cold, going 45 MPH is much less of a traumatic event for me. That extra level of safety does wonders for my stress levels.
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Architect, Artist and Designer of Objects
2012 Infiniti G37X Coupe
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You cannot sell aerodynamics in a can............
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04-03-2013, 11:53 PM
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#75 (permalink)
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EcoModding Lurker
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I got some cool results from Autodesk Project Falcon.
I downloaded a model of my car from Google sketch Up and cleaned it up a bit, not perfect. The Stock Drag Coefficient, that I could find online, for the 1985 Toyota Corolla GTS was a .39 CD. The Result from Falcon was .49 CD. I think one of the plausible disparities in the numbers is the Inaccurate 3D model of the Corolla, like the head lights up, mudflaps that are too wide and the thick antenna besides other details. The result is exiting non-the less.
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04-04-2013, 12:03 AM
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#76 (permalink)
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EcoModding Lurker
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The Resulting CD stabilized after six hrs of it running.
Falcon-ae864 | Flickr - Photo Sharing! |
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09-03-2013, 09:08 PM
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#77 (permalink)
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Ultimate Fail
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Is everyone else having success with Falcon ? So far my copy is still going strong, despite "expiring" several days ago.
I have run a model of a first generation Insight and it returned a .25 Cd, as well as a model of a Karmann Ghia ( thanks Neil ! ) that returned a .48 Cd after an hour and a half render time.
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09-04-2013, 06:22 PM
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#78 (permalink)
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Master EcoModder
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KG
Quote:
Originally Posted by Cd
Is everyone else having success with Falcon ? So far my copy is still going strong, despite "expiring" several days ago.
I have run a model of a first generation Insight and it returned a .25 Cd, as well as a model of a Karmann Ghia ( thanks Neil ! ) that returned a .48 Cd after an hour and a half render time.
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The actual Cd of the Ghia is 0.39.
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09-04-2013, 09:31 PM
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#79 (permalink)
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Master EcoModder
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As I mentioned, that model of the Karmann Ghia has large voids on the underside.
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09-15-2013, 10:40 AM
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#80 (permalink)
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EcoModding Lurker
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I saw only one guy using OpenFOAM. Everybody on here should be using it. If Falcon solves the cases that quickly, it cannot be that accurate. The models need to have a proper surface mesh created and then the fluid region needs to have a good mesh. Just to mesh the car with say a quality mesher will take around 5-10 minutes (this is to say with less than or equal to 5 million cells). With snappyHexMesh in OpenFOAM it will take significantly longer (around 1 hr running in parallel for 5 million cells if i remember correctly). If you all were using OpenFOAM, you could share case files to get everything set up. I can help anybody out if need be. You can also get a Windows version of OpenFOAM from blueCape or something like that. It is very cheap.
I am planning on running cfd on my new golf using OpenFOAM. I will post more when I get the cfd model ready.
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