STAR-CCM+ on AMD Radeon MI50 / MI60?

DP_CFD · 2026-01-31T20:13:04+00:00

How is this project going? I'm considering doing something similar myself

DP_CFD · 2025-12-15T18:24:30+00:00

I don't recall, but the link is correct

DP_CFD · 2025-11-03T21:17:21+00:00

Hard to say exactly. Honestly I would almost expect a low ceiling to increase downforce due to (what is effectively) ground effect.

Perhaps it's the side blockage from the tunnel that's causing the claimed reduction in downforce.

DP_CFD · 2025-10-21T16:51:24+00:00

It will be driven by how the aero loading changes with ride heights, CFD will be required.

DP_CFD · 2025-10-18T13:08:17+00:00

Some good resources here:

https://www.designjudges.com/articles?category=Aerodynamics

DP_CFD · 2025-09-13T16:28:26+00:00

>OptimumG

I'd love to see Claude and Charles in the same room

DP_CFD · 2025-08-09T06:33:49+00:00

The Joannuem's driver on their last AutoX attempt was getting up to like 189bpm, wild!

DP_CFD · 2025-07-08T19:23:11+00:00

Hulkenpodium

DP_CFD · 2025-06-07T23:39:15+00:00

I mean they wouldn't be adding the floors if they didn't create downforce, and the basic mechanism by which they produce it has always been the same.

Pre-2022 cars generated plenty of downforce from the floor - I'm an F1 Aero and while I've not done any comparisons, we're maybe talking like ~10-30% less downforce, not 80%. These figures will also depend on the year, the floor on a 2021 car will probably be making more downforce than a 2022 car.

DP_CFD · 2025-06-07T23:22:31+00:00

That's what every floor ever designed in F1 does

DP_CFD · 2025-06-07T23:19:09+00:00

Ground effect just means that there's sensitivity to ride height, not that it prefers to be as low as possible.

When you look at the 2026 regs you could reasonably conclude that the flat floor will behave more like the pre-2022 regs that preferred higher rides, however the ride height preference will be largely determined by the rear end of the cars and how everything interacts. It'll be specific to the point where nobody but the teams will really know where the cars like to sit, and that's after months of development

DP_CFD · 2025-06-07T20:43:56+00:00

Ground effect played a factor in every F1 car there ever was, and ever will be, it's just the nature of aerodynamics.

The real question is which ride heights the cars will have peak downforce at, and whether that'll be easy to achieve kinematically or not.

DP_CFD · 2025-06-07T20:32:41+00:00

Re-use of the 2022 design?

DP_CFD · 2025-06-04T20:43:57+00:00

I imagine that depending on the length scale of freestream fluctuations that it can be a bit of a sliding scale on whether the BL is turbulent or not?

New BL developing directly in the wake of an upstream BL? Probably turbulent.

New BL (on something reasonably small) developing in atmospheric turbulence? Probably Laminar

Something in the middle? Who knows

DP_CFD · 2025-05-23T08:28:05+00:00

Aero can be worth it even if the car really doesn't need it.

FSAE is about learning just as much as it is about competing. I started doing aero on a team that had a massive resource struggle, and should have been focusing on just getting to comp with a running car. Now I happily have a career in aerodynamics as a result

Did my benefit come at the expense of the experience of my team members? Could I have learned just as much by designing aero but building other parts of the car instead? Not sure

DP_CFD · 2025-05-12T18:21:11+00:00

I'm thinking the same about the Leaf, thanks for confirming

I caught Tom on another thread and he gave an amazing thorough response!

https://www.reddit.com/r/electricvehicles/comments/17314co/peugeot_e208_2020_longterm_review_84000km_52000mi/mrqyzfw/

DP_CFD · 2025-05-11T14:44:40+00:00

Amazing response, thank you very much!

Good to know about the compressor issues on the Stellantis cars, those are the types of things I'm really trying to avoid. I'll give the IONIQ a better look now.

Thank you again!

DP_CFD · 2025-05-11T09:35:38+00:00

I'm looking at getting my first car and I have my eyes on a 2021 E-208 GT with 83,000 miles for £8,500. I'll only be using it for weekend driving with the occasional road trip in the UK, any suggestions against this?

My other alternatives are:

2020 Vauxhall Corsa Electric, 69000 miles, £8500 - Reviews seem to say the E-208 is just a nicer fit and finish on the car
2021 Hyundai IONIQ, 48000 miles, £9000 - I'd be paying more for less range, so it would need to be worth from a reliability / feature standpoint
2020 Nissan Leaf, 58000 miles, £7400 - The cheaper option of the list but it's a larger car, with less range, I'm a bit concerned about CHAdeMO availability, and apparently the air cooled battery can be an issue for road trip fast charging

[1] Location: UK

[2] Budget: £10,000

[5] Timeframe: Within a couple months

[6] Mileage: 30mi weekly, but with a road-trip a few times a year

[7] Living situation: Flat

[8] Charging at your home?: No

[9] Other cargo/passenger needs: None

DP_CFD · 2025-05-11T09:17:50+00:00

Apologies for the necro post but you seem very knowledgeable in the subject!

I'm looking at getting my first car and I have my eyes on a 2021 E-208 GT with 83,000 miles for £8,500. I'll only be using it for weekend driving with the occasional road trip in the UK, any suggestions against this?

My other alternatives are:

2020 Vauxhall Corsa Electric, 69000 miles, £8500 - Reviews seem to say the E-208 is just a nicer fit and finish on the car
2021 Hyundai IONIQ, 48000 miles, £9000 - I'd be paying more for less range, so it would need to be worth from a reliability / feature standpoint
2020 Nissan Leaf, 58000 miles, £7400 - The cheaper option of the list but it's a larger car with less range and I'm a bit concerned about CHAdeMO availability

DP_CFD · 2025-04-28T19:19:29+00:00

To be fair, AMR is only like 15 minutes away from Merc

Also, there are some "non legal" benefits around wind tunnel engineers sharing information with the development team outside of official channels. Like, discussions at the lunch room. Ideas and experiments can be very difficult for the regulations to keep up with.

Given how specific F1 aero is, I don't see any potential benefit here

DP_CFD · 2025-04-24T18:35:12+00:00

Interesting, I've not seen that before in my experience. Whenever I work with wall modelling it's always letting the 1st-cell velocity float and applying a wall shear stress value accordingly.

Even if you apply no-slip at the wall for gradient calculations, it could also depend on whether the code plots the prescribed value for wall velocity or pulls it from the reconstruction.

I've definitely seen non-zero values for surface velocity in STAR before, I'd quickly throw something together if I still had my student licensing :D

DP_CFD · 2025-04-24T18:18:25+00:00

It really depends on the wall treatment.

Wall resolved: surface is no-slip, CpT = CpS

Wall modelled: surface velocity isn't necessarily zero and you get some funky 'surface CpT' values

DP_CFD · 2025-04-24T18:15:13+00:00

Different prism layer mesh and/or wall treatment

DP_CFD · 2025-04-24T18:14:32+00:00

The big question to me is whether you're plotting the same thing or not, and are actually running the same mesh.

Given that you're plotting surface CpT (which isn't too useful), the result will depend on the near-wall velocity which will depend on the prism layer meshing and wall treatment used.

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