Random Wind Tunnel and Smoke Pictures Thread

[freebeard]

I used to be a computer expert, but too much time has passed.

I accept cookies, my main defense is to not go there. There may be other parts of the Web I avoid lately. Cookies can't help against cross-site scripting. Browser extnesion can help there:

https://github.com/radiospiel/Facebook-Blocker

This browser extension -- for Safari and Chrome -- stops Facebook social plugins (including those within iFrames) from running on sites other than Facebook itself. This includes 'Like' buttons, 'Recommended' lists, and should also stop any Facebook scripts from tracking your browsing history

I should probably install that, but Facebook isn't the only bad actor out there.

edit: FB Blocker 404s.

[NeilBlanchard]

A study of the Tesla Semi:

https://www.youtube.com/watch?v=Km1NHe0ZsVo

[freebeard]

The cab/trailer gap is interesting. It allow for flat turns but what happens when the trailer wheels hop a curb?

[kach22i]

MORE random pics...... - Page 4782 - Pelican Parts Forums

[Piotrsko]

Originally Posted by freebeard

The cab/trailer gap is interesting. It allow for flat turns but what happens when the trailer wheels hop a curb?

Good question. However even more so: bottom of a ramp. We dont know if the production ends are flexible or if this was an inexperienced oops. If they are flexible, why have a gap at all?

[kach22i]

Porsche 944 hatch removal aerodynamics
Porsche 944 hatch removal aerodynamics - The Answer is 27

This article arises from a blog reader’s question about Porsche 944s racing in lower categories. Specifically about the influence that removing the rear hatch has on aerodynamics; as in search of a lightweight body, many of the participants decide to remove the hatch, getting rid of 27 “unnecessary” kilograms.

[freebeard]

This is [un]dated but germane to my interest:

CFD post-processing with Blender - The Answer is 27


The embedded video Scientific Visualization in Blender is old, the version 2.57b predates both the Cycles and EEVEE rendering engines, probably Open VDB integration and uses physics imported from Paraview. I think Blender has evolved to where the physics engine can handle Stokes-Navier equations on low end hardware.

The new rendering engines are fast and capably and OpenVDB allows fine-grained simulation economically.

[freebeard]

MIT and NASA engineers demonstrate a new kind of airplane wing

https://phys.org/news/2019-04-mit-na...lane-wing.html

A structural material composed of a cubic array lattice of 3D printed parts.

While it would be possible to include motors and cables to produce the forces needed to deform the wings, the team has taken this a step further and designed a system that automatically responds to changes in its aerodynamic loading conditions by shifting its shape—a sort of self-adjusting, passive wing-reconfiguration process.

[kach22i]

Originally Posted by freebeard

MIT and NASA engineers demonstrate a new kind of airplane wing

I've read about this before, but it's the first time seeing the substructure and mention of Aerogel.

Not sure why they would be using Aerogel, normally it's used for it's insulating thermal properties. Maybe the 3D printed plastics requires thermal protection from freezing (altitude/climate) and overheating (sun/speed)?

[freebeard]

The result is a wing that is much lighter, and thus much more energy efficient, than those with conventional designs, whether made from metal or composites, the researchers say. Because the structure, comprising thousands of tiny triangles of matchstick-like struts, is composed mostly of empty space, it forms a mechanical "metamaterial" that combines the structural stiffness of a rubber-like polymer and the extreme lightness and low density of an aerogel.

It only compares to aerogel.