First Official CFD Scene of the Coanda Exhaust from Sauber

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DinkLv
DinkLv
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Joined: Tue Jun 13, 2017 6:46 pm

First Official CFD Scene of the Coanda Exhaust from Sauber

Post

From https://www.racetechmag.com/2019/03/wil ... s-dilemma/
Car: the 2013 Sauber C32
Red: high velocity Blue: low velocity

Image

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:
Image

Which might have caused Sauber to start testing the Red-Bull-style ramp at Silverstone:
Image

wesley123
wesley123
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Joined: Sat Feb 23, 2008 4:55 pm

Re: First Official CFD Scene of the Coanda Exhaust from Sauber

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Scorching would be from heat effects, not the path the airflow takes.
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DinkLv
DinkLv
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Joined: Tue Jun 13, 2017 6:46 pm

Re: First Official CFD Scene of the Coanda Exhaust from Sauber

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wesley123 wrote:
Thu Jun 30, 2022 7:55 pm
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.

Image

Image

Source: https://www.youtube.com/watch?v=pREgFVRXeDI

J.A.W.
J.A.W.
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Re: First Official CFD Scene of the Coanda Exhaust from Sauber

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How do you delineate actual heat-scorching - from the exhaust combustion products causing - 'smut' staining?

Image
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PlatinumZealot
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Joined: Thu Jun 12, 2008 2:45 am

Re: First Official CFD Scene of the Coanda Exhaust from Sauber

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DinkLv wrote:
Thu Jun 30, 2022 3:02 pm
From https://www.racetechmag.com/2019/03/wil ... s-dilemma/
Car: the 2013 Sauber C32
Red: high velocity Blue: low velocity

https://www.racetechmag.com/wp-content/ ... -small.png

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:
https://www.racecar-engineering.com/wp- ... pc32a1.jpg

Which might have caused Sauber to start testing the Red-Bull-style ramp at Silverstone:
https://www.racecar-engineering.com/wp- ... upsau4.jpg
Sure its a Sauber CFD?

we did a cfd on coanda back in 2012 on this forum.
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DinkLv
DinkLv
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Joined: Tue Jun 13, 2017 6:46 pm

Re: First Official CFD Scene of the Coanda Exhaust from Sauber

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PlatinumZealot wrote:
Fri Aug 19, 2022 2:13 am
DinkLv wrote:
Thu Jun 30, 2022 3:02 pm
From https://www.racetechmag.com/2019/03/wil ... s-dilemma/
Car: the 2013 Sauber C32
Red: high velocity Blue: low velocity

https://www.racetechmag.com/wp-content/ ... -small.png

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:
https://www.racecar-engineering.com/wp- ... pc32a1.jpg

Which might have caused Sauber to start testing the Red-Bull-style ramp at Silverstone:
https://www.racecar-engineering.com/wp- ... upsau4.jpg
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.