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MrTommymxr avatar image
MrTommymxr asked FlyingRaccoon commented

No ground effect with CFD?

Greets,

Is it just me or wasn't native ground effect supposed to be added with the CFD simulation?

https://gyazo.com/9f4a93e4a20e54fde11db9933d82a432.mp4
While rotating the fully loaded 747, the line dont change much, you can see the lines simply clip out of the ground.

1651169419715.png

1651169439370.png

Another thing ive noticed, enabling the Htail interaction causes a way too high 2-3° pitch up angle. In the video there was only mention of a 0.5° change in tail incidence.


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1651169419715.png (2.5 MiB)
1651169439370.png (2.8 MiB)
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FlyingRaccoon avatar image
FlyingRaccoon answered FlyingRaccoon commented

Hello @MrTommymxr

The ground effect is supported but depending on the CFD resolution and aircraft scale, we can have precision issues leading to the effect not being correctly aligned with the ground.

Starting from SU10, we will expose an additional parameter CFD_GroundCollisionVoxelOffset so you can adjust that and match your configuration.

Regards,
Sylvain

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Thanks.

While im here on the topic of ground effect.


The current ground effect calculations ignore the icing penalty. You can see in the clip, The plane struggles to climb, but gains alot of lift close to the ground.

https://gyazo.com/e5bba8e334fb36bc084e345d70233e5c.mp4





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Hello


Reviewing this with our FM dev, I can confirm you the ground effect takes the icing into account. Ground effect intensity is relative so any drag or lift effect will be taken into account when ground effect is computed.


Regards,
Sylvain

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