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Forum: EcoModding Central 11-21-2013, 07:57 PM
Replies: 10
Views: 5,656
Posted By viio
Mufflerectomy on rolling road (Audi TDI)

To satisfy my own curiousity, here's what happened when I tested a rear silencer delete on my Audi TDI. No remap done here, just removing the restriction in the exhaust by chopping it off.

I'm not...
Forum: Aerodynamics 08-16-2013, 03:06 PM
Replies: 61
Views: 12,080
Posted By viio
As requested, 10 foot long tear drops, 3...

As requested, 10 foot long tear drops, 3 dimensional (round). Wind speed is 50 mph.

http://i4.photobucket.com/albums/y146/viio/ecomodder/th_CFDonteardropvariations_zps5ec15962.jpg...
Forum: Aerodynamics 11-01-2012, 07:07 PM
Replies: 83
Views: 24,105
Posted By viio
I've now performed a mufflerectomy on the car to...

I've now performed a mufflerectomy on the car to free up some exhaust flow and also save a bit of weight. I've welded a straight steel pipe on instead of the restrictive rear exhaust silencer. It's a...
Forum: EcoModding Central 04-07-2012, 04:51 PM
Replies: 29
Views: 8,679
Posted By viio
I got this from a supplier here in England who...

I got this from a supplier here in England who does small pieces coated in a carbon fibre effect. He sold me one of the big sheets he starts with for £38 delivered.
Forum: EcoModding Central 04-07-2012, 12:56 PM
Replies: 29
Views: 8,679
Posted By viio
New and better belly pan

A new and better belly pan (lots of photos)

Today I fitted a replacement undertray to my car. Previously it was made out of two pieces of 4mm acrylic. The old one was a bit of a patchwork job, and...
Forum: Aerodynamics 03-25-2012, 01:09 PM
Replies: 83
Views: 24,105
Posted By viio
My other job completed today, two inserts for...

My other job completed today, two inserts for wind deflecting the wiper blades:

http://i4.photobucket.com/albums/y146/viio/ecomodder/20120325_1745161.jpg
...
Forum: Aerodynamics 03-25-2012, 11:40 AM
Replies: 83
Views: 24,105
Posted By viio
Here's one side fitted - much cleaner than the...

Here's one side fitted - much cleaner than the rest of the car lol

http://i4.photobucket.com/albums/y146/viio/ecomodder/20120325_1611241.jpg
Forum: Aerodynamics 03-25-2012, 10:38 AM
Replies: 83
Views: 24,105
Posted By viio
Today I've been busy - I've been making rear...

Today I've been busy - I've been making rear wheel skirts/fairings.

First of all I made a cardboard template.
http://i4.photobucket.com/albums/y146/viio/ecomodder/th_20120325_121304.jpg...
Forum: Aerodynamics 03-08-2012, 06:01 PM
Replies: 119
Views: 89,993
Posted By viio
It's hard to see in the 3d view, but those...

It's hard to see in the 3d view, but those vortexes are just getting swamped by airflow down the side and over the top of the vehicle....
Forum: Aerodynamics 03-08-2012, 04:47 PM
Replies: 119
Views: 89,993
Posted By viio
Okay I put a couple of hours on this tonight -...

Okay I put a couple of hours on this tonight - please excuse the model it's slightly ghetto but it'll do the job. I re-used a couple of parts from other models. I also couldn't quite get the...
Forum: Aerodynamics 03-08-2012, 07:24 AM
Replies: 1
Views: 1,448
Posted By viio
Arrow The "Interesting Reading" thread

Hi folks,

I had a bit of an idea while browsing today - I think we could use a Sticky thread where we can post little snippets of interesting articles regarding aerodynamics. I'll edit this first...
Forum: EcoModding Central 02-26-2012, 05:13 AM
Replies: 66
Views: 28,014
Posted By viio
Some great reading here on back pressure:...

Some great reading here on back pressure:...
Forum: Aerodynamics 02-25-2012, 02:17 PM
Replies: 1
Views: 1,962
Posted By viio
Mudflap delete modelled in CFD

Today I removed my mudflaps after a bit of indecision. I did a bit of CFD to test, and came up with these results.

The flow lines are a bit hit and miss - there is definitely much less turbulence...
Forum: Aerodynamics 02-24-2012, 06:43 PM
Replies: 83
Views: 24,105
Posted By viio
Apologies for the absence, I've been moving...

Apologies for the absence, I've been moving house, job, and internet providers. I've made a few changes since I last posted.

Wheel "spats" are now in place for all 4 wheels - just a 5 inch piece...
Forum: Aerodynamics 02-24-2012, 06:24 PM
Replies: 4
Views: 1,936
Posted By viio
CFD modelling results on side skirts/sills

This weekend I intend to fabricate some side sills (or skirts). Whatever you call them, I intend to have them run as long as I can between the front and back wheels, be around 100mm high, and...
Forum: Aerodynamics 01-19-2012, 01:51 PM
Replies: 81
Views: 14,993
Posted By viio
Here is one using a more accurate model of a...

Here is one using a more accurate model of a European HGV, and the proportions are fixed - 18m long, 4.5m high.

http://i4.photobucket.com/albums/y146/viio/ecomodder/truck18mx45m25m-s.jpg

Next...
Forum: Aerodynamics 01-19-2012, 11:35 AM
Replies: 83
Views: 24,105
Posted By viio
Here's a shot of the CFD from the first blocked...

Here's a shot of the CFD from the first blocked (but not smoothed) grille.

All the twisty turbulent red velocity lines are bad, even if it's only on a small area I'd rather not have my grille...
Forum: Aerodynamics 01-19-2012, 02:37 AM
Replies: 81
Views: 14,993
Posted By viio
Yeah my proportions are a little squiffy but...

Yeah my proportions are a little squiffy but close enough to learn from. I could model again with a 4m truck. I know Vekke is keen to see a road train so I'm going to model that too.
Forum: Aerodynamics 01-18-2012, 02:43 PM
Replies: 79
Views: 39,773
Posted By viio
Well I modelled 3 holes into my 1:1 scale 3d...

Well I modelled 3 holes into my 1:1 scale 3d model of my car, and ran CFD on it. The holes cut through the bumper and come out in the space behind it which catches some airflow near the spare wheel....
Forum: Aerodynamics 01-18-2012, 02:03 PM
Replies: 81
Views: 14,993
Posted By viio
Okay, so here is another model. The colour code...

Okay, so here is another model. The colour code is included in my screenshot, windspeed of 25m/s applied (56mph which is the UK speed limit for a truck of this size).

Truck is 15.1m long, 5.1m...
Forum: Aerodynamics 01-18-2012, 10:23 AM
Replies: 81
Views: 14,993
Posted By viio
It's velocity, with red being the slowest. I'll...

It's velocity, with red being the slowest. I'll post scales from now on. I'm glad the images will be useful enough to warrant more info!
Forum: Aerodynamics 01-18-2012, 10:17 AM
Replies: 81
Views: 14,993
Posted By viio
Well I've done a wheels off before reading your...

Well I've done a wheels off before reading your post, so we've got one anyway. As you might expect in 3d, the car just piles into high velocity wind anyway, and the wake of the truck is higher up.
...
Forum: Aerodynamics 01-17-2012, 05:19 PM
Replies: 81
Views: 14,993
Posted By viio
Tailgating a lorry/semi (modelled in CFD)

I conducted a little experiment this evening to see the aerodynamic effect of driving close to a large vehicle and where a good position to slipstream is.

The red/orange zone is where the air is...
Forum: Aerodynamics 01-17-2012, 03:35 PM
Replies: 83
Views: 24,105
Posted By viio
I'm using SolidWorks and it's FlowSimulation...

I'm using SolidWorks and it's FlowSimulation tools to build a 3d model of the polo so I can test out aerodynamic theory and cut down on drag before I get out the duct tape and glue.

Here's a...
Showing results 1 to 24 of 24

 
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