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The only thing I can think of is that .47mm difference means the bolt weighs slightly less, but then the hole for the bolt is .47mm thicker and that extra structural material would make the part heavier. This could mean slightly more structural integrity at the joint, allowing you to take weight off from somewhere else, or move weight to a more advantageous position.

Suppose you have a pipe with x amount of air flowing through it. Suppose the flow is nice and laminar throughout the pipe, it's velocity distribution will look something like this.

https://files.catbox.moe/ysa5y8.jpg

The flow near the walls will be slower because the drag from the wall's boundary layer and the moving flow slows it down, while it moves faster near the center of the pipe because the greatest mass of air is moving uniformly carrying its momentum forward with no wall to obstruct it.

Now, what happens if we put a vortex in the middle of that pipe?

https://files.catbox.moe/yk9slc.jpg

The vortex itself is occupying the middle of the pipe, as long as the vortex maintains its integrity, the air cannot pass through the vortex it must go around it. Therefore the vortex is acting like a flow restriction, reducing the cross sectional area of the pipe. The shear stress of the vortex squeezes the air against the walls of the pipe, and reduces the cross sectional area of the pipe. In order to maintain continuity, the flow speeds up, and the pressure in the pipe drops.

Hot girl sees something in broke loser, broke loser gains self esteem and becomes giga chad.

People think it's some magic ability, but it isn't. Anyone can have CFD eyes, all you have to do is understand how air behaves. There's no magic to it, you just understand.

When air impinges on a moving object, the object is pressed against the air, the pressure increases. Air mass is deflected away, some of the air sticks to the object, most doesn't. Most of the air flows around a thin layer of air that sticks to the object. To really understand air you really need to understand that air sticks, and the air isn't flowing around an object as much as air is flowing around air.

Let me rephrase that, air doesn't flow around objects, air only flows around more air. The shape the air takes is defined by the object doing the deflecting. Assuming a constant and steady motion in still air, the object displaces air, in a steady and consistent way. That steady and consistent wake then becomes the actual object displacing the air around it. The wake then becomes a sort of virtual bodywork.

Recirculation bubbles aren't necessarily a bad thing, they can create flow restrictions which accelerate flow when needed.
https://youtu.be/qhsTQn0uUOQ?t=1244

Anyone else? OTOH I have lost 9lbs in a week.

You have a few strategies, making air run into a sharp edge will create a vortex as the air tries and fails to roll into the low pressure on the other side of the edge. If the air runs along an elliptical shape, you will also create a vortex.

https://www.youtube.com/watch?v=k4h7UKsEwb8

Here you can see a tomato, having an elliptical shape creates a vortex with no sharp edges.

Finally you can induce a vortex by spinning air, for example a vortex tube introduces compressed air through spiral arranged passages.

https://blog.exair.com/wp-content/uploads/2017/07/vt.png

The so called vortex chamber, is really just making passages at an angle so that air swirls as it enters the main tube.

https://www.youtube.com/shorts/pyUXVXNZLHo

Here you can see the principle but used in water, same shit.

Flowvis only shows you the boundary layer, pressure taps and keel probes only show pressure. PSP shows you both, and unlike flowvis, it's not easily seen by others without a special light. Which means it can be hidden from competitors. Unlike keel probes/pressure taps, pitot tube arrays, there is nothing affecting the Aerodynamics of what you are investigating upstream or downstream.

What are the properties of a vortex? To answer this question, it helps to understand the properties of air, and how air seeks stillness. Air is a substance, this substance occupies space, has mass, and inertia however it is fluid, it yields to solid objects with higher density. When you move a solid object through the air, the air being disturbed, seeks to become still once again. It does this by filling in the wake left by the object with itself. If the air tries to fill in the wake but misses the low pressure center, that is it overshoots, the air will keep circling that low pressure center trying to fill in the wake in order to return to equilibrium. When a mass of air is made to overshoot a low pressure center, the resulting spiral motion is known as a vortex.

A vortex is a mass of air circulating and trying to fill in a center of low pressure. The vortex itself does not produce suction, the vortex is a result of low pressure, and high pressure being separated. Meaning the suction already happened, because the pressure was already increased somewhere else. Now, being that angular momentum is conserved with substances with mass and inertia, such as air, the rotational energy of the vortex is transferred to the surrounding air. This can be helpful to keep airflow attached to a surface, as the vortex wall impinges on a solid surface, it basically scrapes away the boundary layer in the direction of rotation combined with the free stream velocity. This entrains surrounding air to fill in the outwashed air, which further entrains air from upstream.

https://files.catbox.moe/r3fg62.jpg

Notice in this image that the vortices at the wing tip are being pulled into the center of the jet. That is because the entire upper surface is a low pressure surface. This means that pressure gradients can be used to steer vortices.