Riffle:
A short, relatively shallow and coarse-bedded length of stream over which the stream flows at lower velocity and higher turbulence than it normally does in comparison to a pool. (1) from the german word riffeln; rifeln - to groove (2)
Rifling:
The process of making helical grooves in the barrel of a gun or firearm, which imparts a spin to a projectile around its long axis. This spin serves to gyroscopically stabilize the projectile, improving its aerodynamic stability and accuracy (3).
Simply put the spiraled (helical) groves in the barrel of a gun make a bullet spin, getting it to move faster through the medium (air). Without spin it would tumble in flight, but with spin it is stable and on target. And if we consider that nature more often uses the most economic way of doing things, than we have to consider that a particle moving through the Aether most likely has a spiraled profile and/or spins.
In the two clips below we can see 2 different set-ups; (a) without a spiraled profile and (b) with. First of all the torus is given a profile in this example that of a 3 sided triangle, otherwise it wouldn't have any grip.
In this first clip, a non-spiraled torus (a) leaves a large footprint as it periodic changes the inner opening from wide to narrow. The colors show the velocity of the fluid (Red <- vs. Blue ->), and the results indicate that the Torus has a 'bumpy' way of moving forward through the Aether.
In the second clip with the spiraled torus, The current through the center ring seems to be rather constant (red) as it is the case for the 'outsides' that are constant blue. To left there is also a constant light blueish flow observable. This would indicate that a spiraled Torus would move rather fluently through the dense Aether.
