Random Wind Tunnel and Smoke Pictures Thread

[freebeard]

Here's an example of Blender's blistering pace. An Open Source extension to Blender that offers annotation to the objects viewable and selectable, to add information and context.

AMAZING Open Source Project for Blender! (Z-Anatomy)

Whatever is next?

[RedDevil]

Years ago Cleetus McFarland had his bodyless car tested in a wind tunnel.
Now he's back with a body. Cool stuff IMHO.

https://www.youtube.com/watch?v=vj7iLSCd5NA

[freebeard]

Wind tunnels are fun.

[j-c-c]

I agree, when you can afford it.

[freebeard]

Another Blender CFD tutorial. It's not to OpenFOAM level yet, but the possibility is there.

Aerodynamic Streamlines Simulator | Blender Tutorial

[kach22i]

https://classicbroncos.com/forums/th...namics.305965/


https://classicbroncos.com/forums/th....305965/page-2

[j-c-c]

Originally Posted by kach22i

https://classicbroncos.com/forums/th...namics.305965/


https://classicbroncos.com/forums/th....305965/page-2

That apparent cowl recirculation at the base of the windshield IMO goes a long way towards the hazards in making that the engine air intake location, and further reducing that bubble that the windshield has formed, in creating its own drag reducing bubble.
Although I'm not seeing the real world accuracy in the in the streamlines especially post cab.

[freebeard]

Here's a good introduction to wind tunnels, via Hacker News:

jordanwtaylor2.substack.com: Into The Tunnel -- The secret life of wind tunnels

Covers the basics and some exotic stuff.



One interesting one is florescent paint

Yup. Paint your little model plane, rocket or F1 car with a fluorescent paint that quenches in the presence of oxygen and you can illuminate it with UV light and use a camera to measure pressure variation from glow-in-the-dark paint.

A useful diagram about Reynolds Number


I might add that one to my albums. Here's a sample of florid prose:

What is the wind tunnel but a connection between two islands surrounded by sea, metaphorically at least: One is the land of simulation and iterative design, the engineer's playground where the trees are stick-&-cloud abstractions and the faceted ground is perfectly uniform. Everything is perfect on Simulation Island, but nothing stays the same.

The other island is reality. Here the trees are creaking, twisting fractal monstrosities and the ground is littered with the twisted wreckage of broken dreams. It is here that engineers come to be humbled.

The wind tunnel connects the two islands. To enter is to commit yourself to learning what your biases are, and how they are wrong. You may emerge, in red-faced enlightenment, or you may remain lost forever under the sea of Maybe.

Edit: I've tried to add that Reynolds No. pic to my albums, but get network errors on re-upload; as a Webp or jpeg. On a Mac I'd just do a Shft-Cmd-4 screengrab, but I don't know that the Raspberry Pi has that option.

[kach22i]

Originally Posted by freebeard

jordanwtaylor2.substack.com: Into The Tunnel -- The secret life of wind tunnels

From the link provided by Freebeard.

Yep. From the point of view of the sea the wind is just the wind, no twisting there. From the point of view of the boat sailing at an angle however, the wind twists as it nears the base of the sail, pulling it in subtly different directions. Accommodating this in a wind tunnel, since you can’t make the ship move, means physically twisting the airflow (the ‘wind’ in the sails) with purpose-build vanes. Wrap your head around that one!

I have to admit, that is the first image of a sailboat in a wind tunnel that I can recall seeing. What's next a hovercraft?

[kach22i]

WRIGHT BROTHERS WIND TUNNEL
https://www.solarnavigator.net/inven...ind_tunnel.htm

Replica of Wright Brothers' Wind Tunnel

..........no one before Wilbur and Orville checked their data against the performance of an aircraft in flight. The Wrights were the first to verify laboratory results with actual flight tests............