Hello. I am working on a project that requires me to make air move in a vortex. From research, it appears that one of the most common ways of doing this is to rotate a cylindrical screen, which imparts curl to the airflow and thus creates a vortex coaxial and concentric to the center of the cylinder. I would like to make a vortex without a screen obstructing my view of it. Do simple electrical fans, like computer fans, actually cause air to "swirl" effectively? I know that this seems like a basic question, but it is surprisingly difficult to find a good answer online anywhere.