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CFD of Tesla Cybertruck

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Old   December 2, 2019, 08:13
Default CFD of Tesla Cybertruck
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Taichi Yoshida
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Hi.

I've done a CFD analysis of Tesla Cybertruck using Simscale(cloud based openFoam).

Full blog: https://englogs.com/2019/11/30/cfd-a...la-cybertruck/

The Cd (Coefficient of drag) is 0.387.

Simulation: https://www.simscale.com/projects/Sa..._cybertruck-4/

Let me know what you think.

Taichi
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Old   December 3, 2019, 06:16
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I also did an aerodynamic calculation of another phantasie product -- Anakin Skywalkers podracer :-)
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File Type: png racer.png (20.2 KB, 52 views)
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Old   December 3, 2019, 06:47
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Is your podracer going backwards?
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Old   December 3, 2019, 07:29
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Hmmm. It looks like this. Maybe I tried to minimize the drag and found, that it works much better in this direction.


I think that is was just a test of the Harpoon mesher more than 15 years ago :-)
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Old   December 11, 2019, 04:03
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I too made the simulation and got different results.
https://damogranlabs.com/2019/12/tes...-aerodynamics/
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Old   December 11, 2019, 04:22
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Interesting. Thank you for sharing it!

Which CAD model did you use? Which one on GrabCAD?

Someone needs to do an experiment to see the actual flow then

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I too made the simulation and got different results.
https://damogranlabs.com/2019/12/tes...-aerodynamics/
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Old   December 11, 2019, 05:39
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I think it was this one: https://grabcad.com/library/tesla-cy...k-3d-printed-1

Don't expect measurements to be very different (like 0.3 or whatever)
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Old   December 11, 2019, 06:41
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Are you sure?
My CAD software says it's only about 16inch wide though. So the Reynolds number is definitely different... then I realised you mentioned the model had been scaled up in your blog

The model I've made is a simplified one and it could well be over-simplified. I may try making a more detailed one in the future.

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I think it was this one: https://grabcad.com/library/tesla-cy...k-3d-printed-1

Don't expect measurements to be very different (like 0.3 or whatever)
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Old   December 11, 2019, 08:28
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I guess this is the fatal difference. You can't just scale the model - you need to keep the same Reynolds number. That's why wind tunnels are often heated (up to 200C!) to lower viscosity for scaled models.
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Old   December 11, 2019, 08:36
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I know and I didn't scale up or anything mate.
I made the model based on the actual dimensions although it's not 100% accurate obviously.

You said, in your blog, that you had scaled up the model size in CAD software to match the real size, didn't you?

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I guess this is the fatal difference. You can't just scale the model - you need to keep the same Reynolds number. That's why wind tunnels are often heated (up to 200C!) to lower viscosity for scaled models.
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Old   December 11, 2019, 09:05
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Yes, I did. I have no idea which units it was made in anyway. I also wrote it's not a very precise model, when scaled up to specified length width and height didn't match.
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