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#1 |
New Member
Taichi Yoshida
Join Date: Dec 2019
Posts: 5
Rep Power: 6 ![]() |
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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#2 |
Senior Member
Joern Beilke
Join Date: Mar 2009
Location: Dresden
Posts: 507
Rep Power: 20 ![]() |
I also did an aerodynamic calculation of another phantasie product -- Anakin Skywalkers podracer :-)
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#3 |
Super Moderator
Alex
Join Date: Jun 2012
Location: Germany
Posts: 3,412
Rep Power: 49 ![]() ![]() |
Is your podracer going backwards?
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#4 |
Senior Member
Joern Beilke
Join Date: Mar 2009
Location: Dresden
Posts: 507
Rep Power: 20 ![]() |
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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#5 |
Senior Member
Nejc
Join Date: Feb 2017
Location: Slovenia
Posts: 196
Rep Power: 9 ![]() |
I too made the simulation and got different results.
https://damogranlabs.com/2019/12/tes...-aerodynamics/ |
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#6 | |
New Member
Taichi Yoshida
Join Date: Dec 2019
Posts: 5
Rep Power: 6 ![]() |
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 ![]() Quote:
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#7 |
Senior Member
Nejc
Join Date: Feb 2017
Location: Slovenia
Posts: 196
Rep Power: 9 ![]() |
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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#8 | |
New Member
Taichi Yoshida
Join Date: Dec 2019
Posts: 5
Rep Power: 6 ![]() |
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. ![]() Quote:
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#9 |
Senior Member
Nejc
Join Date: Feb 2017
Location: Slovenia
Posts: 196
Rep Power: 9 ![]() |
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 200°C!) to lower viscosity for scaled models.
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#10 |
New Member
Taichi Yoshida
Join Date: Dec 2019
Posts: 5
Rep Power: 6 ![]() |
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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#11 |
Senior Member
Nejc
Join Date: Feb 2017
Location: Slovenia
Posts: 196
Rep Power: 9 ![]() |
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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Tags |
automobile, automotive aerodynamics, car aerodynamics, vehicle |
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