The first thing to know is that a swirl tile will be distorted in most cases. To get more of an idea how it works, uncheck Fix Curvature (or set Curvature Amount = 50).
Number of Tiles = number of pie shaped tiles.
Twist Amount / 10 = number of swirls from left to center.
Tile Type: unchecked Horizontal Swirl Tile, checked Vertical Swirl Tile.
Ring Reflection: checked creates a mirrored image along the swirl line, this also cuts the size of one tile in half.
Fix Curvature and Curvature Adjust allow you to adjust the radiating zoom amount. The distance between the swirls is adjusted.
Does this help?
Math meets art meets psychedelia.