UCP Supercar II

[70cuda88]

you know i never thought about that, thx

[cmcpokey]

Why don't you print the file i posted and draw freehand on that, and them go trhu the CAD with it.

just played with some mspaint to get some body design ideas.. all looks very citroen-esque to me.

[ruim20]

Had a quick go at it to, and a starting 3d of it.

[Matra et Alpine]

I like the lines Ruim.
Not sure about the fron from that angle, but willing to wait to see how you fill it out.

[70cuda88]

i like the 3d rendering but the front looks alot like a maybach

[Zytek_Fan]

Sculpt the front end a little bit to make it more rounded to reduce drag

[jediali]

anyone here done fluid dynamics? like boundry layers, seperation, wake, etc...thats how you find drag.

[Coventrysucks]

anyone here done fluid dynamics? like boundry layers, seperation, wake, etc...thats how you find drag.

Most of the time, to find drag you just stick a model in a wind tunnel.

Or, you can estimate the Cd figure and do a simple calculation.

Fluid dynamics is largely a time consuming and very expensive way of generating a pretty picture.

[hightower99]

Damn that is really close to what I have been imagining good work Ruim

I think you might want to get alittle more head room for interior space as well as the typical reinforcements of a roof.

I like the blockey front end

We need to see the back though (it's cut off from the pictures) and may I suggest that you don't enclose the engine in the same compartment as the cabin. It makes cooling that much easier.

[jediali]

Most of the time, to find drag you just stick a model in a wind tunnel.

Or, you can estimate the Cd figure and do a simple calculation.

Fluid dynamics is largely a time consuming and very expensive way of generating a pretty picture.

with all due respect there is no point in just using a wind tunnel. F1 engineers arent just pretty faces some are are experts in hydraulics/fluid dynamics before you consider finite element software and wind tunnels. While your car here is no F1 car you cant ignore drag! good luck anyways

[Coventrysucks]

with all due respect there is no point in just using a wind tunnel.

Why?

For this project, a small scale wind tunnel test would tell you more than you needed to know, and would take you minutes.

Do a tare run, then stick the model in - there's your drag & front/rear lift values instantly.

Try doing that CFD - it'd probably take you weeks. Then another week to make a minor correction, and analyse it again.

There is a reason why, despite computing power, large budgets and clever people, F1 teams still use wind tunnels for most of their work.

you cant ignore drag!

I didn't say you should.

A Cd value is not that hard to estimate - it will probably be 0.3Something.

Then you merely do the following calculation, and you have a value for drag.

F(D) = 1/2ρAV²Cd

You're going to need to do some quick calculation anyway, because CFD doesn't give you rolling resistance - so after all that time and effort in getting a super accurate drag value is ruined by a comparatively high error from that.

[jediali]

Why?

For this project, a small scale wind tunnel test would tell you more than you needed to know, and would take you minutes.

Do a tare run, then stick the model in - there's your drag & front/rear lift values instantly.

Try doing that CFD - it'd probably take you weeks. Then another week to make a minor correction, and analyse it again.

There is a reason why, despite computing power, large budgets and clever people, F1 teams still use wind tunnels for most of their work.


I didn't say you should.

A Cd value is not that hard to estimate - it will probably be 0.3Something.

Then you merely do the following calculation, and you have a value for drag.

F(D) = 1/2ρAV²Cd

You're going to need to do some quick calculation anyway, because CFD doesn't give you rolling resistance - so after all that time and effort in getting a super accurate drag value is ruined by a comparatively high error from that.

your absolutley right, i this project this is method will do fine. If i was designing a car. I was thinking more about more in-depth design processes as used in industry. A wind tunnel is a very useful asset but so is a fast effective fluid mechanics engineer equiped with a computer and a good knowledge.

[McReis]

An important question: where will it be built? China? (we need to shave production costs).

[jediali]

An important question: where will it be built? China? (we need to shave production costs).

drakkies shed

[Coventrysucks]

A wind tunnel is a very useful asset but so is a fast effective fluid mechanics engineer equiped with a computer and a good knowledge.

Here is a generic example of the type of work carried out by an automotive aerodynamics development department.

Pre development

Competitor testing / benchmarking - wind tunnel
Research
Target setting

Styling/Design phase

Initial modelling of themes - CFD
Scale modelling - wind tunnel
Full Scale clay - wind tunnel
Aerobuck testing - wind tunnel
Cooling aerobuck testing - wind tunnel
Cooling airflow - CFD

Quality maturation

Continued aerobuck testing - wind tunnel
Prototype aero surveys - wind tunnel
Production vehicle status tests - wind tunnel

Your CFD guy's going to be sat there for quite a while, twiddling his thumbs