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First Official CFD Scene of the Coanda Exhaust from Sauber
Posted: 30 Jun 2022, 16:02
by DinkLv
From
https://www.racetechmag.com/2019/03/wil ... s-dilemma/
Car: the 2013 Sauber C32
Red: high velocity Blue: low velocity
Doesn't seem to represent the real-world flow field well enough as the exhaust gas scorches the bodywork a little bit in the long run:
Which might have caused Sauber to start testing the Red-Bull-style ramp at Silverstone:
Re: First Official CFD Scene of the Coanda Exhaust from Sauber
Posted: 30 Jun 2022, 20:55
by wesley123
Scorching would be from heat effects, not the path the airflow takes.
Re: First Official CFD Scene of the Coanda Exhaust from Sauber
Posted: 30 Jun 2022, 23:54
by DinkLv
wesley123 wrote: ↑30 Jun 2022, 20:55
Scorching would be from heat effects, not the path the airflow takes.
It depends. If it's due to local heat-soaking then the bodywork parts closer to the exhaust manifold would tend to scorch more. However, the scorched part is way behind even the exhaust outlet and becomes more severe in the bulkier part. As a result, I come to believe it is due to the high-temp exhaust flow making direct contact with the bodywork, especially under yaw.
Here's also a vorticity sim of the same vehicle under straightline and yaw conditions. Seems like there's a part of the exhaust flow that stays attached to the bodywork behind the outlet for a distance, even at 0 degrees of yaw. The same happens for up to at least 15 degrees of yaw, which is a common working condition in mid-to-low speed corners.
Source:
https://www.youtube.com/watch?v=pREgFVRXeDI
Re: First Official CFD Scene of the Coanda Exhaust from Sauber
Posted: 15 Jul 2022, 13:03
by J.A.W.
How do you delineate actual heat-scorching - from the exhaust combustion products causing - 'smut' staining?
Re: First Official CFD Scene of the Coanda Exhaust from Sauber
Posted: 19 Aug 2022, 03:13
by PlatinumZealot
Sure its a Sauber CFD?
we did a cfd on coanda back in 2012 on this forum.
Re: First Official CFD Scene of the Coanda Exhaust from Sauber
Posted: 22 Aug 2022, 06:30
by DinkLv
PlatinumZealot wrote: ↑19 Aug 2022, 03:13
Sure its a Sauber CFD?
we did a cfd on coanda back in 2012 on this forum.
Confirmed with Willem Toet. Also, you can see from top of nose that this is a 2013 Sauber C32.