Williams FW43B

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Just_a_fan
Just_a_fan
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Re: Williams FW43B

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jjn9128 wrote:
Thu Apr 01, 2021 8:49 am
Just_a_fan wrote:
Thu Apr 01, 2021 8:41 am
How do they get the three fins / VGs in below the diffuser? Doesn't the surface facing downwards have to be visible from below? I.e. the diffuser's surface must be visible and those fins would prevent that.
Those are the footplate - it's a weird quirk in the software because the mesh isn't watertight it shows parts which aren't on the slice plane as if they're on the same plane.
Footplate? How do any fins get formed below the car? The surfaces are supposed to be continuous aren't they?
Turbo says "Dumpster sounds so much more classy. It's the diamond of the cesspools." oh, and "The Dutch fans are drunk. Maybe"

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jjn9128
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Re: Williams FW43B

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Just_a_fan wrote:
Thu Apr 01, 2021 8:56 am
Footplate? How do any fins get formed below the car? The surfaces are supposed to be continuous aren't they?
They're not below the surface, they're outboard of the diffuser.
Image
#aerogandalf
"There is one big friend. It is downforce. And once you have this it’s a big mate and it’s helping a lot." Robert Kubica

Just_a_fan
Just_a_fan
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Re: Williams FW43B

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jjn9128 wrote:
Thu Apr 01, 2021 9:03 am
Just_a_fan wrote:
Thu Apr 01, 2021 8:56 am
Footplate? How do any fins get formed below the car? The surfaces are supposed to be continuous aren't they?
They're not below the surface, they're outboard of the diffuser.
https://db3pap006files.storage.live.com ... pmode=none
Ah! I understand now. D'oh! from me there #-o
:lol:
Turbo says "Dumpster sounds so much more classy. It's the diamond of the cesspools." oh, and "The Dutch fans are drunk. Maybe"

wesley123
wesley123
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Re: Williams FW43B

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jjn9128 wrote:
Thu Apr 01, 2021 8:12 am
wesley123 wrote:
Thu Apr 01, 2021 12:41 am
Such design was already done around 2000, afaik the Jordans had a very similar kick
Yes. I'm surprised they've "lengthened" the diffuser so much though.

I guess it's this rule:
The surfaces lying on the step plane which do not meet one of the vertical transitions may be curved upwards at their boundaries with an arc whose radius of curvature is no greater than 100mm at any point, with no inflection, which is tangential to the surface and applied perpendicular to the boundary. In no case may the arc start further than 100mm from the boundary (when measured on the surface and perpendicular to this boundary).
If I remember correctly such a design was done to deal with the boundary layer. Sadly enough can't find where I got it from
"Bite my shiny metal ass" - Bender

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jjn9128
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Re: Williams FW43B

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wesley123 wrote:
Thu Apr 01, 2021 2:47 pm
jjn9128 wrote:
Thu Apr 01, 2021 8:12 am
wesley123 wrote:
Thu Apr 01, 2021 12:41 am
Such design was already done around 2000, afaik the Jordans had a very similar kick
Yes. I'm surprised they've "lengthened" the diffuser so much though.

I guess it's this rule:
The surfaces lying on the step plane which do not meet one of the vertical transitions may be curved upwards at their boundaries with an arc whose radius of curvature is no greater than 100mm at any point, with no inflection, which is tangential to the surface and applied perpendicular to the boundary. In no case may the arc start further than 100mm from the boundary (when measured on the surface and perpendicular to this boundary).
If I remember correctly such a design was done to deal with the boundary layer. Sadly enough can't find where I got it from
Makes some sense. Basically they force turbulent transition for all Reynolds numbers at that point. Means at higher Reynolds numbers the diffuser might separate and stall - might be advantageous. It means the diffuser kick is <100mm more upstream than the “diffuser” too. So bit more forward COP.
#aerogandalf
"There is one big friend. It is downforce. And once you have this it’s a big mate and it’s helping a lot." Robert Kubica

Manoah2u
Manoah2u
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Re: Williams FW43B

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Got to get some races under their belt, but it does seem the Williams is performing rather decent.
Will be interesting for some smart people to take the leaked car model and investigate it profoundly,
and compare it to their 2020 contender and where they have changed things.

Offcourse there's more than just aero, but with their own high-res models out there, and to compare this to race data, i'm sure there's some stuff to learn. If I were HAAS and AlfaRomeo, i'd get my hands on some student of aerodynamics to do a unpaid internship with some benefits (visit races and talk to the engineers) and use it to learn some stuff. With some luck you learn something you might not know or understand Williams' aero phylisophy and why it works/didnt work.
Dumpster sounds so much more classy. It's the diamond of the cesspools.

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variante
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Joined: Mon Apr 09, 2012 10:36 am
Location: Monza

Re: Williams FW43B

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jjn9128 wrote:
Wed Mar 31, 2021 5:31 pm
Unfortunately I think it's too dirty to do any CFD with
Akhchuallyi...
Image
Not the best CFD in the world, but this is about as much as my laptop can handle.
When i first saw that weird step, i thought "WTF is that?". Wesley mentioned an old Jordan using an apparently similar geometry for aero purposes, which also came to my mind, but this is essentially different, and probably serves no aero purpose. Your explanation, that this is to "cheat" the regulations, makes sense and really explains this oddity.
Pretty smart trick, i must say.


Manoah2u wrote:
Fri Apr 02, 2021 7:53 pm
If I were HAAS and AlfaRomeo, i'd get my hands on some student of aerodynamics to do a unpaid internship with some benefits (visit races and talk to the engineers) and use it to learn some stuff.
I guess i should unmute my phone for THE call.
Hopefully, it won't be from Williams suing me for espionage...

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jjn9128
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Re: Williams FW43B

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variante wrote:
Sat Apr 03, 2021 7:53 pm
jjn9128 wrote:
Wed Mar 31, 2021 5:31 pm
Unfortunately I think it's too dirty to do any CFD with
Akhchuallyi...
https://i.imgur.com/x610kHs.png
Not the best CFD in the world, but this is about as much as my laptop can handle.
When i first saw that weird step, i thought "WTF is that?". Wesley mentioned an old Jordan using an apparently similar geometry for aero purposes, which also came to my mind, but this is essentially different, and probably serves no aero purpose. Your explanation, that this is to "cheat" the regulations, makes sense and really explains this oddity.
Pretty smart trick, i must say.
This is the CAD model, or did you recreate it?
#aerogandalf
"There is one big friend. It is downforce. And once you have this it’s a big mate and it’s helping a lot." Robert Kubica

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variante
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Joined: Mon Apr 09, 2012 10:36 am
Location: Monza

Re: Williams FW43B

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jjn9128 wrote:
Sat Apr 03, 2021 8:16 pm
This is the CAD model, or did you recreate it?
The actual thing, in all its glory.
I had to work on it a bit, and there is no internal aero. But it gives an idea...
(I've also added a copy of the old strakes, from 2020)

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jjn9128
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Re: Williams FW43B

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variante wrote:
Sat Apr 03, 2021 8:34 pm
jjn9128 wrote:
Sat Apr 03, 2021 8:16 pm
This is the CAD model, or did you recreate it?
The actual thing, in all its glory.
I had to work on it a bit, and there is no internal aero. But it gives an idea...
(I've also added a copy of the old strakes, from 2020)
Well that needs a front page article :lol:
#aerogandalf
"There is one big friend. It is downforce. And once you have this it’s a big mate and it’s helping a lot." Robert Kubica

Manoah2u
Manoah2u
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Re: Williams FW43B

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variante wrote:
Sat Apr 03, 2021 8:34 pm
jjn9128 wrote:
Sat Apr 03, 2021 8:16 pm
This is the CAD model, or did you recreate it?
The actual thing, in all its glory.
I had to work on it a bit, and there is no internal aero. But it gives an idea...
(I've also added a copy of the old strakes, from 2020)
absolutely boss
Dumpster sounds so much more classy. It's the diamond of the cesspools.

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Stu
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Location: Norfolk, UK

Re: Williams FW43B

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variante wrote:
Sat Apr 03, 2021 7:53 pm
jjn9128 wrote:
Wed Mar 31, 2021 5:31 pm
Unfortunately I think it's too dirty to do any CFD with
Akhchuallyi...
https://i.imgur.com/x610kHs.png
Not the best CFD in the world, but this is about as much as my laptop can handle.
When i first saw that weird step, i thought "WTF is that?". Wesley mentioned an old Jordan using an apparently similar geometry for aero purposes, which also came to my mind, but this is essentially different, and probably serves no aero purpose. Your explanation, that this is to "cheat" the regulations, makes sense and really explains this oddity.
Pretty smart trick, i must say.


That is great!
The ‘trip’ edge formed at the edge of the radius and diffuser roof section doesn’t appear to be doing much, which makes it a bit strange (IMO); what effect would it have if the surface on the rear face were porous and connected to the rear of the diffuser (by a hollow section diffuser ceiling). Just curious....
Common sense is not as common as stupidity, but it is better to be uninformed than to be mis-informed...

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Mattchu
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Joined: Mon Jul 07, 2014 6:37 pm

Re: Williams FW43B

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So it would seem Williams are the only team on the grid that still uses mostly sloted horizontal louvres in the barge-board area!

I wonder if we`ll see that changed during the course of the season or they don`t see much gain and will concentrate on next year...

I thought this was a nice shot, but shows how much girth the FW43B has.

Image

DP_CFD
DP_CFD
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Joined: Tue Apr 13, 2021 3:08 am
Location: Toronto, Canada

Re: Williams FW43B

Post

variante wrote:
Sat Apr 03, 2021 8:34 pm
jjn9128 wrote:
Sat Apr 03, 2021 8:16 pm
This is the CAD model, or did you recreate it?
The actual thing, in all its glory.
I had to work on it a bit, and there is no internal aero. But it gives an idea...
(I've also added a copy of the old strakes, from 2020)
Do you have a link to the old 2020 strakes, or is that something personal of yours? I'm around here so I don't really know my way around the forum.

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variante
112
Joined: Mon Apr 09, 2012 10:36 am
Location: Monza

Re: Williams FW43B

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DP_CFD wrote:
Tue Apr 13, 2021 3:16 am
Do you have a link to the old 2020 strakes, or is that something personal of yours? I'm around here so I don't really know my way around the forum.
Better if you model them by yourself, because i can't ensure their accuracy.
They're quite easy to make...just a couple of vertical extrusions.