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.jpgNotice 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.
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